{"id":858,"date":"2025-10-17T17:20:10","date_gmt":"2025-10-17T17:20:10","guid":{"rendered":"https:\/\/ndacc.cas.hamptonu.edu\/?page_id=858"},"modified":"2025-10-28T15:15:34","modified_gmt":"2025-10-28T15:15:34","slug":"attendee-resources","status":"publish","type":"page","link":"https:\/\/ndacc.cas.hamptonu.edu\/?page_id=858","title":{"rendered":"Presentation Portal"},"content":{"rendered":"\n<p>This page enables registered attendees to view posters and send and answer questions about presentations. The first time you click on a presentation title, you will be required to login.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>Those desiring to submit a paper to the NDACC Special issue, send an email using the Symposium <a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?page_id=433\" data-type=\"link\" data-id=\"https:\/\/ndacc.cas.hamptonu.edu\/?page_id=433\">contact form<\/a> with subject &#8216;Scientific Program Committee&#8217;.<br>\u00a0<\/p>\n\n\n<style>\n.msi-schedule .msi-table { table-layout: fixed; width: 100%; border-collapse: separate; border-spacing: 0; }\n.msi-schedule .msi-col-id        { width: 12ch; }\n.msi-schedule .msi-col-presenter { width: 24ch; }\n.msi-schedule .msi-col-title     { width: auto; }\n.msi-session-heading { font-size: 1.3em; margin: 1.1em 0 0.3em; }\n.msi-session-heading.msi-top { margin-top: 0; }\n.msi-conveners { font-size: 0.95em; margin: 0 0 0.25em; }\n.msi-session-desc { font-size: 0.95em; margin: 0 0 0.6em; color: #333; }\n.msi-schedule .msi-table tbody tr.data-row td { padding-top: 12px; padding-bottom: 12px; border-bottom: 1px solid #eee; }\n.msi-schedule .msi-table tbody tr.data-row:last-child td { border-bottom: none; }\n.msi-schedule th.msi-id, .msi-schedule th.msi-presenter, .msi-schedule td.msi-id, .msi-schedule td.msi-presenter { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }\n.msi-schedule a.msi-has-tooltip { position: relative; }\n.msi-schedule a.msi-has-tooltip::after {\n    content: attr(data-abstract); position: absolute; left: 0; top: 100%; margin-top: 6px; z-index: 9999; display: none;\n    width: clamp(40ch, 60ch, 80ch); padding: 10px 12px; background: #111; color: #fff; border-radius: 6px; line-height: 1.4;\n    white-space: normal; box-shadow: 0 6px 18px rgba(0,0,0,0.25); box-sizing: border-box;\n}\n.msi-schedule a.msi-has-tooltip:hover::after, .msi-schedule a.msi-has-tooltip:focus::after { display: block; }\n.msi-id-dup::after { content: \"\u2022\"; color: #C00; margin-left: 4px; font-weight: bold; cursor: help; }\n.msi-id-flag::after { content: \"\u2022\"; color: #E67E22; margin-left: 4px; font-weight: bold; cursor: help; }\n.msi-id-gap::after { content: \"\u2022\"; color: #1E90FF; margin-left: 4px; font-weight: bold; cursor: help; }\n<\/style><h2 class=\"msi-session-heading msi-top\">Symposium Keynotes<\/h2><div class=\"msi-schedule\"><table class=\"wp-list-table widefat striped msi-table\"><colgroup><col class=\"msi-col-id\"><col class=\"msi-col-presenter\"><col class=\"msi-col-title\"><\/colgroup><thead><tr><th class=\"msi-id\">ID<\/th><th class=\"msi-presenter\">Presenter<\/th><th>Title<\/th><\/tr><\/thead><tbody><tr class=\"data-row\"><td class=\"msi-id\">K_S01<\/td><td class=\"msi-presenter\">Susan Solomon<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-235c7eeb\" class=\"msi-has-tooltip\" data-abstract=\"I will describe how early ground-based measurement methods developed and probed the global stratosphere, first as separate instrument developed by different groups, and later in coordinated campaigns. Independent measurements by different techniques complemented one another to amplify their scientific significance and\u2026\">How A Few Ground-Based Measurements Coalesced Into Remarkable Networks: NDSC and NDACC<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">K_S02<\/td><td class=\"msi-presenter\">Michael J. Kurylo<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-7e1495fd\" class=\"msi-has-tooltip\" data-abstract=\"I will take you on a brief journey to initially describe how a laboratory kineticist became educated about the intricacies of ground-based atmospheric measurements. Under the guidance of many talented instrumentalists and modelers, I was soon tasked with coordinating the US component for an international partnership\u2026\">A Walk Down NDSC\/NDACC Memory Lane<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">K_S03<\/td><td class=\"msi-presenter\">Wolfgang Steinbrecht<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-c718ff44\" class=\"msi-has-tooltip\" data-abstract=\"The discovery of the Antarctic Ozone Hole in 1984 was a dramatic sign that something was wrong with the ozone layer. Pictures of the hole might have been instrumental for signing the Vienna Convention for the Protection of the Ozone-Layer in 1985, and for the eventual phase-out of Ozone Depleting Substances started in\u2026\">NDACC, looking back and looking ahead<\/a><\/td><\/tr><\/tbody><\/table><\/div><h2 class=\"msi-session-heading\">Session A: Creating and improving long-term data: Instrumentation, processing and providing past, present and future data-streams<\/h2><div class=\"msi-schedule\"><table class=\"wp-list-table widefat striped msi-table\"><colgroup><col class=\"msi-col-id\"><col class=\"msi-col-presenter\"><col class=\"msi-col-title\"><\/colgroup><thead><tr><th class=\"msi-id\">ID<\/th><th class=\"msi-presenter\">Presenter<\/th><th>Title<\/th><\/tr><\/thead><tbody><tr class=\"data-row\"><td class=\"msi-id\">K_A01<\/td><td class=\"msi-presenter\">Sophie Godin-Beekmann &amp; Emmanuel Mahieu<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-cd0958a9\" class=\"msi-has-tooltip\" data-abstract=\"The celebration of the 35th anniversary of NDACC will offer a valuable opportunity to reflect on the network&#039;s scientific achievements and the collaboration it has fostered, as well as to revisit the key steps that led to its inception. The various instruments at the Observatoire de Haute Provence (OHP), e.g. LIDAR,\u2026\">Ups and downs in creating and maintaining decade-long high-quality ground-based observational data series<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_A01<\/td><td class=\"msi-presenter\">Alistair Bell<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-409b90dd\" class=\"msi-has-tooltip\" data-abstract=\"The University of Bern has developed and operated microwave radiometers to observe the composition, temperature, and winds of the middle atmosphere for several decades. Over time, advancements in technology have improved the measurement range, as well as the temporal and vertical resolution, and the precision of the\u2026\">Continuous Monitoring and Development in Microwave Radiometry for Middle Atmosphere Sounding<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_A02<\/td><td class=\"msi-presenter\">Michel Van Roozendael<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-6c7e95b9\" class=\"msi-has-tooltip\" data-abstract=\"Bromine has been of high interest to atmospheric scientists, in particular since its role in the Antarctic ozone hole led to the 1992 Copenhagen Amendment to the Montreal Protocol. The atmospheric budget of active bromine (BrOx) and, to a large extent, the total inorganic bromine (Bry) is constrained by measurements\u2026\">Reassessment of the long-term trend in stratospheric BrO columns at Harestua (60\u00b0 N) and Lauder (45\u00b0 S) based on three decades of observations<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_A03<\/td><td class=\"msi-presenter\">Alberto Redondas Marrero<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-1956aa4f\" class=\"msi-has-tooltip\" data-abstract=\"Over the past two decades, the Regional Brewer Calibration Center (RBCC-E) has conducted numerous calibration campaigns, culminating in the commencement of the XX RBCC campaign this summer. This work serves as a comprehensive summary of the RBCC-E&#039;s accomplishments, challenges, and achievements during this 20-year\u2026\">20 years of the Iza\u00f1a Regional Calibration Center- Europe<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_A04<\/td><td class=\"msi-presenter\">Luca Egli<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-7d03f968\" class=\"msi-has-tooltip\" data-abstract=\"Over the past seven years, PMOD\/WRC has evaluated a Gigahertz Optik BTS2048-UV-S-F array spectroradiometer with optical fiber setup for total ozone column (TOC) measurements. PMOD\/WRC also developed the KoherentTOC software for the retrieval of TOC through a custom double ratio technique. In 2024, integrating the\u2026\">Improvements of the spectra of the BTS Solar instrument for total column ozone retrieval and global UV radiation measurements<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_A05<\/td><td class=\"msi-presenter\">Sergey Shilov<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a6071eab\" class=\"msi-has-tooltip\" data-abstract=\"Air pollution and climate change pose critical challenges that affect global health and the environment. Addressing these issues starts with accurately identifying and quantifying air pollutants and greenhouse gas (GHG) emissions. This presentation reviews advanced analytical solutions, including a range of optical\u2026\">Advanced Solutions for Monitoring of Air Quality and Greenhouse Gases<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_A06<\/td><td class=\"msi-presenter\">Kate Smith<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-b5cd1c1e\" class=\"msi-has-tooltip\" data-abstract=\"Understanding the size distribution of stratospheric aerosols is critical for determining the influence these particles have on the global radiation budget. A persistent aerosol layer exists between 15 \u2013 30 km altitude above the earth\u2019s surface, and characterizing the background state and variability of these\u2026\">The Balloon Baseline Stratospheric Aerosol Profiles (B2SAP) dataset for in situ measurements of stratospheric aerosol<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_A07<\/td><td class=\"msi-presenter\">Michael Sicard<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-64ffcb9b\" class=\"msi-has-tooltip\" data-abstract=\"The OPAR-Maido NDACC site at Reunion Island (21\u00b0S, 55\u00b0E) hosts 50+ instruments measuring a myriad of atmospheric variables from ground level up to the mesosphere. This talk will provide an update on the instruments run in the framework of NDACC. In particular the recent upgrade of the OPAR-Maido aerosol and water\u2026\">Updates of OPAR NDACC site at Reunion Island (21\u00b0S, 55\u00b0E)<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_A08<\/td><td class=\"msi-presenter\">Andrea Pazmino<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-11fcb657\" class=\"msi-has-tooltip\" data-abstract=\"The first Syst\u00e8me d&#039;Analyse par Observation Z\u00e9nithale (SAOZ) UVVIS instrument was installed at the Antarctic station of Dumont d&#039;Urville (67\u00b0S, 140\u00b0E) in January 1988 after the signature of the Montreal Protocol. The SAOZ is a passive remote-sensing instrument that measures the sunlight scattered from the zenith sky.\u2026\">SAOZ network: more than 35 years of continuous O3 and NO2 total columns observations<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_A09<\/td><td class=\"msi-presenter\">Louis Miralli\u00e9<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-cbd6641f\" class=\"msi-has-tooltip\" data-abstract=\"Ozone profile data records from surface-based instruments have been re-evaluated within the APARC\/LOTUS project and individual MLR trends have been estimated over selected NDACC stations (Godin-Beckmann, ACP, 2022). These include Ozonesondes (O3S), Fourier-Transform InfraRed (FTIR) spectrometers, Umkehr observations\u2026\">Regional Bayesian composite of surface-based ozone partial columns<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A01<\/td><td class=\"msi-presenter\">Ankie Piters<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-f959bd25\" class=\"msi-has-tooltip\" data-abstract=\"The tropical NDACC station Paramaribo in Suriname, South America, has performed upper-air measurements for more than twenty-five years. Weekly ozone sondes have been launched since 1999, with only few gaps. The dataset has been analyzed, using multiple linear regression (MLR), to determine height-resolved trends in\u2026\">Twenty-five years of Paramaribo upper air observations<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A02<\/td><td class=\"msi-presenter\">Joshua Richards<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-ab05dc4c\" class=\"msi-has-tooltip\" data-abstract=\"Understanding the vertical distribution of ozone concentration is important for diagnosing human, vegetation, and global radiation impacts. Balloon-borne ozonesondes (and attached radiosondes) represent the only instrument with the capability to measure the complete profiles of ozone, pressure, temperature, and\u2026\">Data Homogenization and Improvements to the Beltsville, MD, USA, 20-year Ozonesonde Record<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A03<\/td><td class=\"msi-presenter\">Wolfgang Steinbrecht<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-dad91b7d\" class=\"msi-has-tooltip\" data-abstract=\"Ground-based NDACC instruments are providing some of the longest ozone profile records. The ozone lidar at Haute Provence, for example, provides routine ozone profile data starting in July 1985. Many NDACC ozone time series start in the 1990s, when stratospheric ozone depletion was near its maximum. FTIR ozone profile\u2026\">Ozone profile time series from NDACC lidars, microwave radiometers, FTIRs, Umkehr, and sondes<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A04<\/td><td class=\"msi-presenter\">Eliane Maillard Barras<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-87c6eeaf\" class=\"msi-has-tooltip\" data-abstract=\"Ozonesondes measure atmospheric in-situ ozone concentration from ground up to 30 km. ENSCI ECC sondes are launched three times a week from Payerne (46.82\u00b0N - 6.92\u00b0E), forming one of the very valuable datasets of NDACC. The timeseries has been processed according to the recommendations of ASOPOS2.0: the pump flow is\u2026\">Processing of the Payerne ozonesonde timeseries with the time response correction (TRC) method: validation and post-2000 trend estimation.<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A05<\/td><td class=\"msi-presenter\">Sophie Godin-Beekmann<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-168bf9a0\" class=\"msi-has-tooltip\" data-abstract=\"The Observatoire Haute Provence (OHP) station is one of the few long-term measuring stations for vertical ozone profiles in southern Europe. Since 1991, vertical ozone distribution has been monitored by the OHP weekly electrochemical concentration cell (ECC) ozone soundings. In this study, we present a correction made\u2026\">Correction of the Observatoire Haute Provence electrochemical concentration cell (ECC) ozonesonde data record<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A06<\/td><td class=\"msi-presenter\">Matt Tully<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-8dfecf74\" class=\"msi-has-tooltip\" data-abstract=\"The Bureau of Meteorology operates three long-term ozonesonde stations in the southern hemisphere, Broadmeadows (37.69\u00b0 S, 144.95\u00b0 E), Macquarie Island (54.50\u00b0 S, 158.95\u00b0 E) and Davis (68.58\u00b0 S, 77.97\u00b0 E). The NDACC site Broadmeadows (a suburb of Melbourne) continues the program previously located at Aspendale\u2026\">Comparison of Science Pump Corporation and EnSci Ozonesondes at Broadmeadows<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A07<\/td><td class=\"msi-presenter\">Voltaire A. Velazco<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-656283ef\" class=\"msi-has-tooltip\" data-abstract=\"The Meteorological Observatory Hohenpeissenberg (MOHp) of the German Weather Service (DWD) maintains one of the longest continuous records of ground-based total ozone column (TOC) measurements, with Dobson and Brewer observations dating back to 1967 and 1984, respectively. This contribution presents recent efforts to\u2026\">From Legacy to Future: Advancing Long-Term Total Ozone Column Observations at Hohenpeissenberg<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A08<\/td><td class=\"msi-presenter\">Christof Janssen<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-ea32a35e\" class=\"msi-has-tooltip\" data-abstract=\"Accurate ozone measurements in the atmosphere depend heavily on spectroscopic data, particularly in the UV range. Recently, the ozone absorption cross section at 253.65 nm - used in standard reference photometers (SRPs) for calibrating ambient ozone instruments - was re-evaluated, with a newly recommended value\u2026\">Towards new laser based UV absorption cross sections around 308 nm for traceable atmospheric remote sensing of ozone<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A09<\/td><td class=\"msi-presenter\">Yann Poltera<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-9017edc5\" class=\"msi-has-tooltip\" data-abstract=\"Measurements of water vapor, ozone and aerosol are of pivotal importance for the study of dynamical, microphysical and chemical processes in the upper troposphere and lower stratosphere (UT\/LS). In particular, measuring water vapor is most challenging in that region, requiring high SNR and high accuracy at low air\u2026\">Observations of water vapor in the UT\/LS of unprecedented accuracy with nonequilibrium corrected low-GWP frost point hygrometers<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A10<\/td><td class=\"msi-presenter\">Simone Brunamonti<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-4773e5bd\" class=\"msi-has-tooltip\" data-abstract=\"Water vapor (H2O) in the upper troposphere-lower stratosphere (UTLS) is of great importance to the Earth&#039;s radiative balance, yet accurate measurements of H2O in this region (~8-25 km altitude) are still highly challenging. We developed ALBATROSS, a compact (&lt; 3.5 kg) laser spectrometer for balloon-borne\u2026\">ALBATROSS &#8211; a laser spectrometer for balloon-borne measurements of UTLS water vapor<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A11<\/td><td class=\"msi-presenter\">Pierre Fogal<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-c156e5f5\" class=\"msi-has-tooltip\" data-abstract=\"The atmosphere above the polar regions continues to be largely under-sampled in comparison to that at mid-latitudes. The harsh local conditions, coupled with at best sparse populations, makes it difficult to support substantial measurement programs. In the Arctic, the most northerly available sites are found on\u2026\">PEARL: The Polar Environment Atmospheric Research Laboratory &#8211; A platform for ground-based measurements of the High Arctic Atmosphere and Environs<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A12<\/td><td class=\"msi-presenter\">Tomoo Nagahama<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-24cb364d\" class=\"msi-has-tooltip\" data-abstract=\"Hydrocarbons in the atmosphere during the daytime produce tropospheric ozone, an air pollutant, through chemical reaction processes with nitrogen oxides. Most hydrocarbons are emitted as volatile organic compounds, and approximately one-third is isoprene. Therefore, it is essential to assess the distribution of\u2026\">Long-term variation in isoprene column amount retrieved from the NDACC high-resolution FTIR dataset measured in Rikubetsu, Japan<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A13<\/td><td class=\"msi-presenter\">Hideaki Nakajima<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-19092d43\" class=\"msi-has-tooltip\" data-abstract=\"After the discovery of the Antarctic ozone hole in 1980s, artificial CFCs and HCFCs were banned by the Montreal protocol, and their replacement HFCs were started to use for refrigerants and forming agents. The major HFCs currently in use are: R-404A (HFC-143a (52%) + HFC-125 (44%) + HFC-134a (4%)), R-410A (HFC-32\u2026\">First retrieval of HFC-125 by ground-based FTIR in Tsukuba, Japan<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A14<\/td><td class=\"msi-presenter\">Christof Janssen<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-57456f4c\" class=\"msi-has-tooltip\" data-abstract=\"The European megacity of Paris, home to 11 million residents, provides a unique platform for atmospheric and air quality research. Since 2011, our team has been operating a high-resolution Fourier-Transform infrared Spectrometer (FTS-Paris) to monitor the atmospheric composition over the city centre of Paris, France.\u2026\">A new NDACC-IRWG site at Paris: More than 10-year measurements of ethane and carbon monoxide over a European megacity.<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A15<\/td><td class=\"msi-presenter\">Gennadi Milinevsky<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-f6d7c2e9\" class=\"msi-has-tooltip\" data-abstract=\"The design and measurements of the ground-based microwave radiometer RSO3CO-120-1 developed for long-term monitoring of O3\/CO (110.8\/115.3 GHz) in the upper stratosphere and mesosphere are presented. Installed in Changchun (43.85\u00b0N, 125.33\u00b0E), northeastern China, this instrument fills a critical gap in atmospheric\u2026\">The simultaneous atmospheric ozone and carbon monoxide measurements by microwave 110\/115 GHz radiometer in Changchun, northeast China<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A16<\/td><td class=\"msi-presenter\">Chaonan Lv<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-755850d7\" class=\"msi-has-tooltip\" data-abstract=\"Our research team at the Anhui Institute of Optics and Fine Mechanics (AIOFM), Hefei Institutes of Physical Science, Chinese Academy of Sciences, has deployed a ground-based Stereoscopic monitoring network within China using independently developed 2D MAX-DOAS (Multi-Axis Differential Optical Absorption Spectroscopy)\u2026\">2D MAX-DOAS Observation Network in China<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A17<\/td><td class=\"msi-presenter\">Weiwei Hu<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-21ea9804\" class=\"msi-has-tooltip\" data-abstract=\"Nitrous acid (HONO) plays a key role in the atmospheric oxidation process, which significantly affects air quality and climate change. In this study, we carried out long-term observations of the vertical distribution of HONO, NO2 and aerosols in typical areas such as rural, urban, highland, plain and coastal areas,\u2026\">Spatiotemporal distribution and formation mechanisms of HONO based on long-term observations from the MAX-DOAS network in China<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_A18<\/td><td class=\"msi-presenter\">Alexis Merlaud<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-305d7046\" class=\"msi-has-tooltip\" data-abstract=\"Bromine monoxide (BrO) is one of the main drivers of stratospheric ozone depletion. BrO has been measured from the ground at several stations across the globe using its absorption in the UV spectral range. Zenith spectra taken at twilight are analyzed with the Differential Optical Absorption Spectroscopy (DOAS)\u2026\">Towards centralised stratospheric BrO profile retrieval within the FRM4DOAS system<\/a><\/td><\/tr><\/tbody><\/table><\/div><h2 class=\"msi-session-heading\">Session B: Validating atmospheric measurements from satellites and from other platforms<\/h2><div class=\"msi-schedule\"><table class=\"wp-list-table widefat striped msi-table\"><colgroup><col class=\"msi-col-id\"><col class=\"msi-col-presenter\"><col class=\"msi-col-title\"><\/colgroup><thead><tr><th class=\"msi-id\">ID<\/th><th class=\"msi-presenter\">Presenter<\/th><th>Title<\/th><\/tr><\/thead><tbody><tr class=\"data-row\"><td class=\"msi-id\">K_B01<\/td><td class=\"msi-presenter\">Daan Hubert &amp; Tijl Verhoelst<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-aac870df\" class=\"msi-has-tooltip\" data-abstract=\"Since its establishment in 1991, the Network for the Detection of Stratospheric Change (NDSC) \/ Network for the Detection of Atmospheric Composition Change (NDACC) has provided high-quality, long-term ground-based measurements that play a critical role in the validation of atmospheric composition data from satellites.\u2026\">A journey towards 50 years of NDACC cooperation with the atmospheric composition satellites<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_B01<\/td><td class=\"msi-presenter\">Jiansheng Zou<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-86d440f3\" class=\"msi-has-tooltip\" data-abstract=\"ACE-FTS is a Fourier Transform Spectrometer (FTS) aboard the Canadian SCISAT satellite and, as the primary payload for the Atmosphere Chemistry Experiment (ACE) mission, it has been routinely measuring vertical profiles of over 70 atmospheric molecules and isotopologues using solar occultation since February 2004. To\u2026\">Validation of ACE-FTS v5.3 ozone data with NDAAC ground-based instruments<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_B02<\/td><td class=\"msi-presenter\">Nigel Richards<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-10e92541\" class=\"msi-has-tooltip\" data-abstract=\"The Ozone Mapping and Profiler Suite (OMPS) Limb Profiler (LP) performs limb measurements of scattered solar radiation in the ultraviolet and visible wavelengths, which allow for the retrieval of high vertical resolution ozone profiles from 12.5km to 57.5km with full global coverage. The first LP was launched on board\u2026\">Validation of OMPS Limb Profiler Ozone Retrievals Using Ground-Based Correlative Data<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_B03<\/td><td class=\"msi-presenter\">Jun Wang<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-1829401b\" class=\"msi-has-tooltip\" data-abstract=\"series is widely regarded as one of the most accurate methods for remotely sensing atmospheric composition in the upper troposphere and stratosphere (UTS). Its high accuracy stems from the direct application of Beer&#039;s Law and the use of the solar disk as an intense, stable, and spatially homogeneous illumination\u2026\">SAGE III\/ISS: an Anchor Standard for Monitoring Atmospheric Composition in the Upper Troposphere and Stratosphere<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_B04<\/td><td class=\"msi-presenter\">Juseon Bak<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-275acfa3\" class=\"msi-has-tooltip\" data-abstract=\"This study assesses the performance of the GEMS ozone profile product, focusing on the improvements introduced in the reprocessed version 3.0. The retrieval operates in the 310-330 nm spectral range and yields total degrees of freedom for ozone ranging from 1.5 to 3. Although the vertical sensitivity is limited and\u2026\">GEMS ozone profile retrieval: impact and validation of version 3.0 improvements<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_B05<\/td><td class=\"msi-presenter\">Arno Keppens<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-e059835a\" class=\"msi-has-tooltip\" data-abstract=\"Several families of satellite sounders provide tropospheric ozone observations, motivated by the need to monitor its impact on human health, vegetation and ecosystems (as a harmful agent) and climate (as a greenhouse gas). However, tropospheric ozone is highly variable over a wide range of spatial and temporal scales\u2026\">A constellation approach to the validation of tropospheric ozone observations from space<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_B06<\/td><td class=\"msi-presenter\">Niko Fedkin<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-4200f371\" class=\"msi-has-tooltip\" data-abstract=\"The Outer Continental Shelf (OCS) of the Gulf of America is a highly developed offshore region for oil and natural gas (ONG) production. Among the emissions produced by ONG operations is nitrogen dioxide (NO2), an air quality pollutant that is precursor to surface ozone. Monitoring NO2 from space is particularly vital\u2026\">Assessment of TEMPO NO2 columns for monitoring emissions from oil and gas operations using comparisons with Pandora and SCOAPE-II campaign data<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_B07<\/td><td class=\"msi-presenter\">Zachary Fasnacht<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-41055700\" class=\"msi-has-tooltip\" data-abstract=\"Satellite based observations of trace gases such as nitrogen dioxide (NO2) and ozone (O3) are important for monitoring air quality, atmospheric correction of surface reflectance including ocean color (OC) retrievals and improving chemistry transport models. Over the past few decades, trace gas instruments in low earth\u2026\">Validating High Spatial Resolution Trace Gas Retrievals from the PACE Ocean Color Instrument<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_B08<\/td><td class=\"msi-presenter\">Thierry Marbach<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-b22808f1\" class=\"msi-has-tooltip\" data-abstract=\"Cal\/Val has been an essential activity for all successful EO missions since the early 1960s. At EUMETSAT, a mission&#039;s Cal\/Val activities are directly linked to a its End-User Requirements Document (EURD) and provide the characterization and uncertainties to help determine if the goals set out in the EURD are met over\u2026\">EUMETSAT&#8217;s approach to Cal\/Val Gap Analyses and Fiducial Reference Measurements<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B01<\/td><td class=\"msi-presenter\">Tijl Verhoelst<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-0e308add\" class=\"msi-has-tooltip\" data-abstract=\"The NDACC network of zenith-scattered-light DOAS (ZSL-DOAS) instruments produces high-quality stratospheric NO2 column data records since the 1980s. These multi-decadal datasets, supported by standardized protocols and harmonized retrievals, span diverse observational and geophysical conditions enabling robust trend\u2026\">NDACC ZSL-DOAS instruments: the backbone of satellite stratospheric NO2 data record validation<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B02<\/td><td class=\"msi-presenter\">Meike K. Rotermund<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-c17b89a3\" class=\"msi-has-tooltip\" data-abstract=\"We present surface volume mixing ratios (VMRs) and tropospheric vertical column densities (VCDs) of NO2 and HCHO from an EnviMes MAX-DOAS instrument located on a roof at the Environment and Climate Change Canada (ECCC) Downsview headquarters near the northern boundary of Toronto. This newly NDACC-affiliated dataset is\u2026\">Validating MAX-DOAS Surface VMRs and Tropospheric Columns of NO2 and HCHO in Toronto, Canada<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B03<\/td><td class=\"msi-presenter\">Karin Kreher<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-2b637ad0\" class=\"msi-has-tooltip\" data-abstract=\"The third Cabauw Intercomparison of UV-Vis DOAS Instruments, CINDI-3, took place from 21 May to 24 June 2024 at the Cabauw Experimental Site for Atmospheric Research (CESAR), a semi-rural observation facility located between the cities of Rotterdam and Utrecht in the Netherlands. One of its key objectives was to\u2026\">CINDI-3 (3rd Cabauw Intercomparison of UV-Vis DOAS Instruments): Overview and Campaign Highlights<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B04<\/td><td class=\"msi-presenter\">Fernanda Cabello<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-1bf9d048\" class=\"msi-has-tooltip\" data-abstract=\"The estimation of the atmospheric energy budget in current modelling presents considerable uncertainty over the Southern Ocean and Antarctica. The lack of cloud phase measurements in this region is considered one of the causes of this bias. In this research, we aim to estimate the predominant thermodynamic phase in\u2026\">Estimating the cloud thermodynamic phase over King George Island during austral summer with MicroPulseLidar measurements.<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B05<\/td><td class=\"msi-presenter\">Corinne Vigouroux<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-2c4ec00f\" class=\"msi-has-tooltip\" data-abstract=\"Ground-based Fourier Transform Infrared (FTIR) instruments from NDACC provide long-term measurements of many trace gases at over 20 stations. This network is already used in S5P validation of CO, CH4 (Sha et al., 2021), HCHO (Vigouroux et al., 2020), and NO2 (https:\/\/mpc-vdaf.tropomi.eu\/). Ozone is a key FTIR species,\u2026\">Validation of all S5P ozone products (total columns, profiles, and tropospheric columns) using the FTIR NDACC network<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B06<\/td><td class=\"msi-presenter\">Gaia Pinardi<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-504d01fc\" class=\"msi-has-tooltip\" data-abstract=\"MAX-DOAS, direct sun DOAS and FTIR measurements are increasingly used as fiducial reference measurements (FRM) for validating HCHO satellite observations. Understanding their strengths and limitations, and assessing their consistency is crucial for robust and consolidated validation results. In this study, we take\u2026\">Intercomparison of MAX-DOAS, FTIR and direct sun DOAS HCHO retrievals in Xianghe (China)<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B07<\/td><td class=\"msi-presenter\">Mary Cate McKee<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-2021b4f1\" class=\"msi-has-tooltip\" data-abstract=\"Spatiotemporal collocation of measurements between instruments is an essential yet challenging component of the data validation process. Traditional methods of collocation may simply consider length of time and physical distance between measurements. However, the distribution of atmospheric constituents may change\u2026\">SAGE III\/ISS Validation methods<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B08<\/td><td class=\"msi-presenter\">Kaley A. Walker<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-e80a2ac1\" class=\"msi-has-tooltip\" data-abstract=\"Ground-based measurements provide critical data to validate satellite retrievals of atmospheric trace gases and to assess the long-term stability of these measurements. As of February 2025, the Canadian-led Atmospheric Chemistry Experiment (ACE) satellite mission has been making measurements of the Earth&#039;s atmosphere\u2026\">More than Two Decades of the Canadian Arctic ACE\/OSIRIS Validation Project at PEARL<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B09<\/td><td class=\"msi-presenter\">David E. Flittner<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-3753d59d\" class=\"msi-has-tooltip\" data-abstract=\"The Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III\/ISS) has been observing Earth&#039;s stratosphere and upper troposphere since June 2017 with the solar\/lunar occultation technique, to enhance our understanding of ozone layer recovery and other processes impacting chemistry and\u2026\">The &#8220;Comparisons&#8221; tab: a public avenue to view SAGE III\/ISS data against NDACC observations.<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B10<\/td><td class=\"msi-presenter\">Daan Hubert<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-5869ae30\" class=\"msi-has-tooltip\" data-abstract=\"The Ozone Essential Climate Variable has been integral to ESA&#039;s Climate Change Initiative (CCI) and the EU&#039;s Copernicus Climate Change Service (C3S, https:\/\/climate.copernicus.eu) since their inception. These programmes collaborate to develop, mature, generate and sustain harmonised, consistent and validated\u2026\">Ground-based observations : a treasure trove to assess stratospheric ozone observations by nadir and limb-viewing sensors<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B11<\/td><td class=\"msi-presenter\">Gordon J. Labow<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-8aaaca8d\" class=\"msi-has-tooltip\" data-abstract=\"Pandora instruments have been taking total column ozone measurements at NASA&#039;s Goddard Space Flight Center since 2018. These data have been compared to a reference Brewer Double Spectrophotometer located nearby (within 200 meters). Performance of the Pandora instruments will be evaluated. Comparisons were made as a\u2026\">Pandora Total Column Ozone Measurements Compared to Measurements from a Brewer Spectrophotometer.<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B12<\/td><td class=\"msi-presenter\">Jonguk Park<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-2f2ba7d2\" class=\"msi-has-tooltip\" data-abstract=\"Nitrogen dioxide (NO2) and formaldehyde (HCHO) are the two key elements constituting the ozone (O3) pollution, as they can effectively represent NOx and volatile organic compound reactivity in the atmosphere. The ground-based ultraviolet-visible Pandora spectrometer measures vertical column densities (VCDs) of these\u2026\">Variabilities of NO2 and HCHO from Pandora observations and the assessment of their surface concentrations using ground-based in-situ observations<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B13<\/td><td class=\"msi-presenter\">Jean-Christopher Lambert<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-1fbb5688\" class=\"msi-has-tooltip\" data-abstract=\"Launched in October 2017 on an early afternoon polar orbit, Sentinel-5 Precursor (S5P) is the first atmospheric composition mission of the Copernicus Earth Observation programme. Its payload TROPOspheric Monitoring Instrument (TROPOMI) measures on a daily basis and at unprecedented horizontal resolution the global\u2026\">A Decade of NDACC Support to the Sentinel-5P TROPOMI Operational Validation Facility<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_B14<\/td><td class=\"msi-presenter\">Thomas F Hanisco<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-000fc60e\" class=\"msi-has-tooltip\" data-abstract=\"Since 2019 the NASA Pandora and ESA Pandonia projects have been collaborating to coordinate and facilitate the expansion of a global network of ground-based spectrometers to support space-based measurements of trace gases relevant to air quality (NO2, O3, HCHO, SO2, ...). This network of standardized, calibrated\u2026\">Validation and support of space-based measurements with the Pandonia Global Network of ground-based spectrometers<\/a><\/td><\/tr><\/tbody><\/table><\/div><h2 class=\"msi-session-heading\">Session C: NDACC synergistic environment in support of field campaigns and other chemistry and climate- observing networks<\/h2><div class=\"msi-schedule\"><table class=\"wp-list-table widefat striped msi-table\"><colgroup><col class=\"msi-col-id\"><col class=\"msi-col-presenter\"><col class=\"msi-col-title\"><\/colgroup><thead><tr><th class=\"msi-id\">ID<\/th><th class=\"msi-presenter\">Presenter<\/th><th>Title<\/th><\/tr><\/thead><tbody><tr class=\"data-row\"><td class=\"msi-id\">K_C01<\/td><td class=\"msi-presenter\">Sergey Khaykin<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-5f6040a3\" class=\"msi-has-tooltip\" data-abstract=\"The eruption of the submarine Hunga volcano on 15 January 2022 was associated with a powerful blast that injected water and sulfur throughout the stratospheric layer, leading to an unprecedented increase in the global stratospheric water mass by 13% as compared to climatological levels and a 5-fold increase in the\u2026\">Assessing the impact of Hunga eruption on the global stratospheric composition using a synergy of NDACC, GRUAN and satellite observations<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_C01<\/td><td class=\"msi-presenter\">Roeland Van Malderen<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-aa941d3b\" class=\"msi-has-tooltip\" data-abstract=\"Within the framework of the second phase of the Tropospheric Ozone Assessment Report (TOAR-II), the HEGIFTOM focus working group aimed at harmonizing (tropospheric) ozone profile measurements from 5 different ground-based techniques: ozonesondes, Lidar, FTIR, Dobson Umkehr (all belonging to NDACC), and In-service\u2026\">Harmonization, Evaluation, and Trend Estimation of Ground-based Tropospheric Ozone Measurements from NDACC and IAGOS instruments.<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_C02<\/td><td class=\"msi-presenter\">Stephen Montzka<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a24b5059\" class=\"msi-has-tooltip\" data-abstract=\"Carbonyl sulfide (OCS) is an important reservoir of atmospheric sulfur and a key player in multiple bio-geo-chemical processes that influence stratospheric ozone and climate. Atmospheric measurements of OCS from multiple platforms have revealed seasonal variations and atmospheric gradients different from many other\u2026\">Carbonyl sulfide from different angles; investigating how combining results from both NDACC and NOAA enhances our understanding of its atmospheric distributions, seasonalities, and trends<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_C03<\/td><td class=\"msi-presenter\">Bianca Baier<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-bb77d0e9\" class=\"msi-has-tooltip\" data-abstract=\"The balloon-borne AirCore sampling system passively captures a continuous, high-resolution air sample from the lower stratosphere (~25 km) to the Earth&#039;s surface. Cavity ring-down spectroscopy measurements of AirCores result in profiles of carbon dioxide (CO2), methane (CH4), carbon monoxide (CO) and - circa 2019,\u2026\">Cross-network engagement opportunities between NDACC and NOAA&#8217;s AirCore Program<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_C04<\/td><td class=\"msi-presenter\">Alexandre Baron<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a65a57de\" class=\"msi-has-tooltip\" data-abstract=\"Stratospheric aerosols play a crucial role in the climate system, but uncertainties persist in understanding the chemical, dynamical, and microphysical processes governing their distribution and variability. The chemical and radiative impacts of stratospheric aerosols hinge on particle size distribution. However,\u2026\">The NOAA Balloon Baseline Stratospheric Aerosol Profiles &#8211; In situ insight on the stratospheric aerosol layer<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_C05<\/td><td class=\"msi-presenter\">Pawan Gupta<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-39459061\" class=\"msi-has-tooltip\" data-abstract=\"Three Decades of Atmospheric Aerosols Measurements from AERONET Pawan Gupta, Elena Lind, Brent Holben, Philippe Goloub , Carlos Toledano, Africa Barreto, Ihab Abboud, Ian Lau, and Sheng-Hsiang Wang, Huizheng Che, Yu Zheng The AERONET program is a federation of ground-based sun-photometer networks and operates in\u2026\">Three Decades of Atmospheric Aerosols Measurements from AERONET<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_C06<\/td><td class=\"msi-presenter\">Anne M. Thompson<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-47e0087b\" class=\"msi-has-tooltip\" data-abstract=\"The IGAC\/TOAR II activity (Tropospheric Ozone Assessment Report, 2021-; dozens of publications at https:\/\/bg.copernicus.org\/ articles\/special_issue10_1256.html) includes analyses of tropospheric ozone over the past 20-30 years based on satellite estimates and ozone data from NDACC-affiliated ground-based (GB)\u2026\">Tropospheric Ozone Trends in the Tropics (1998-2023): An Overview of Observational and Statistical Perspectives<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_C07<\/td><td class=\"msi-presenter\">Steven Compernolle<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-cc8dbef5\" class=\"msi-has-tooltip\" data-abstract=\"The retrieval of tropospheric trace gases data products from satellite observations requires accurate knowledge of several intermediate quantities. A typical example is the retrieval of the tropospheric nitrogen dioxide (NO2) column which requires the intermediate retrieval of the total and of the stratospheric NO2\u2026\">Towards end-to-end validation of TROPOMI tropospheric data: A cross-network approach<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_C08<\/td><td class=\"msi-presenter\">Ruud Dirksen<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-41a92d60\" class=\"msi-has-tooltip\" data-abstract=\"The GCOS Reference Upper Air Network (GRUAN) consists of approximately 30, globally distributed measurement sites that provide long-term reference observations of essential climate variables such as temperature and water vapour for the purpose of climate monitoring. For this purpose sites employ in situ (radiosondes,\u2026\">GRUAN: the road to long-term reference observations<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C01<\/td><td class=\"msi-presenter\">Nis Jepsen<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-6f2b62f7\" class=\"msi-has-tooltip\" data-abstract=\"We present a novel approach to atmospheric sounding that enables the autonomous retrieval of radiosondes using a lightweight, AI-assisted glider platform - referred to as the meteoglider system. In this system, the sounding equipment is lifted by a weather balloon. Upon balloon burst at high altitude, the meteoglider\u2026\">Autonomous Retrieval of Atmospheric Sounding Systems Using the Meteoglider Platform<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C02<\/td><td class=\"msi-presenter\">Kimberly Strong<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-ccb8d22f\" class=\"msi-has-tooltip\" data-abstract=\"The Polar Environment Atmospheric Research Laboratory (PEARL) at Eureka, Nunavut is located at 80N, 1100 km from the North Pole. Eureka has been home to an Environment and Climate Change Canada Weather Station since 1947, and the Arctic Stratospheric Ozone Observatory (AStrO), built in 1992, was a component of the\u2026\">Synergistic Network Measurements of the Arctic Atmosphere at the Polar Environment Atmospheric Research Laboratory<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C03<\/td><td class=\"msi-presenter\">Joseph Hung<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-0a5ec437\" class=\"msi-has-tooltip\" data-abstract=\"Trace gases in the High Arctic play an important role in the energy balance of the region, particularly in relation to the prolonged periods of darkness and daylight. This interaction is especially important in the far- and mid-infrared spectrum, where the terrestrial emission is significant. At the Polar Environment\u2026\">Filling the polar night gap in High Arctic FTIR trace gas measurements<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C04<\/td><td class=\"msi-presenter\">B\u00e4rbel Vogel<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-2c6ca1f8\" class=\"msi-has-tooltip\" data-abstract=\"The Asian summer monsoon has a strong convectional component with which aerosols are able to be lifted up into the lower stratosphere. Due to usually long lifetimes and long-range transport aerosols remain there much longer than in the troposphere and are also able to be advected around the globe. Our aim of this\u2026\">Does the Asian summer monsoon play a role in the stratospheric aerosol budget of the Arctic?<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C05<\/td><td class=\"msi-presenter\">Martine De Mazi\u00e8re<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-f52de29f\" class=\"msi-has-tooltip\" data-abstract=\"The overarching goal of the Horizon Europe project &#039;Cooperation and AgReements enhancing Global interOperability for Aerosol, Cloud and Trace gas research infrastructures&#039; (CARGO-ACT) project is to deliver a clear roadmap for sustainable global cooperation between key organizations around the globe to provide all\u2026\">NDACC showcases global interoperability for trace gas and aerosol remote sensing in the CARGO-ACT project.<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C06<\/td><td class=\"msi-presenter\">Tuukka Pet\u00e4j\u00e4<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-beb737b5\" class=\"msi-has-tooltip\" data-abstract=\"ACTRIS (Aerosol, Clouds and Trace Gases Research Infrastructure) is a European environmental research infrastructure that provides high-quality data, services, and access to facilities for studying short-lived atmospheric constituents - mainly aerosols, clouds, and trace gases - and their role in climate and air\u2026\">ACTRIS &#8211; High Quality Atmospheric data to All Users<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C07<\/td><td class=\"msi-presenter\">Thierry Leblanc<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-8fcb4714\" class=\"msi-has-tooltip\" data-abstract=\"For decades, NDACC and other groundbased networks have struggled to provide consistent, standardized products, easy to access, understand and use, tailored to all users, eventually enabling unambiguous scientific interpretation. The path to the ideal network data product is challenging: data providers must adapt to\u2026\">Centralized Data Processing as an added value to multi-network data integration: From standardized uncertainty budget to traceability and consistency, lessons learned from the development of the Global Lidar data Analysis Software Suite (GLASS)<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C08<\/td><td class=\"msi-presenter\">Debra E. Kollonige<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-094f3744\" class=\"msi-has-tooltip\" data-abstract=\"The Southern Hemisphere Additional Ozonesondes (SHADOZ) network, jointly operated by NASA-Goddard Space Flight Center (GSFC), NOAA&#039;s Global Monitoring Lab (GML) and international partners, collects and archives ozonesonde-radiosonde data records for 16 operating stations in the tropics and subtropics. There are now\u2026\">Southern Hemisphere Additional Ozonesondes (SHADOZ) Network Updates: 2025 Activities and Ozone Trends Analysis<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C09<\/td><td class=\"msi-presenter\">Herman G.J. Smit<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-3db0e270\" class=\"msi-has-tooltip\" data-abstract=\"Ozonesondes are balloone borne small electrochemical sensors which are widely used by 60 stations in the global observation networks of GAW and NDACC, having made accurate measurements of ozone from the ground to 35 km for more than 50 years. The high resolution data are used extensively for trend analyses and for\u2026\">Quality Assurance of the Global Ozonesonde Network: A Continuous Process of Reporting and Assessing the Sondes Measurement Quality on their Consistency and Uncertainties<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C10<\/td><td class=\"msi-presenter\">Katherine R. Wolff<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-fde52192\" class=\"msi-has-tooltip\" data-abstract=\"The NASA Wallops Flight Facility (WFF; Wallops Island, VA., USA; 37.9N, 75.5W) is the longest continuously operating ozonesonde station in the continental United States (since 1970) and the SHADOZ Natal station (Natal, Brazil; 5.4S, 35.4W) is the longest running ozonesonde measurement station in the tropics (since\u2026\">High Quality Ozonesonde Datasets for Ozone Trends Studies: Using NASA Wallops Flight Facility and SHADOZ Dual Soundings and Long-term Records for Demonstration<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C11<\/td><td class=\"msi-presenter\">Ryan Stauffer<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-134e08af\" class=\"msi-has-tooltip\" data-abstract=\"Seven years ago, the Department of Interior&#039;s BOEM (Bureau of Ocean Energy Management), the Agency with Air Quality (AQ) jurisdiction over the offshore waters off the Louisiana (US) Gulf coast, asked NASA to determine the feasibility of using satellite data to measure offshore emissions in a region of concentrated oil\u2026\">Satellite, Ship, and Aircraft-based Views of US Gulf Coast Air Quality: The June and October 2024 SCOAPE-II Project<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C12<\/td><td class=\"msi-presenter\">Christian Rolf<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-cb2f6ebc\" class=\"msi-has-tooltip\" data-abstract=\"Variations in the chemical composition of the UTLS region crucially impact on the Earth&#039;s radiation budget, atmospheric circulation and surface climate. In particular, increases in stratospheric water vapor cause strong radiative effects and a positive climate feedback. The most critical region for these radiative\u2026\">Investigation of water vapour transport processes in the extratropical lowest stratosphere with the JUelich Modular Balloon Observatory (JUMBO)<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C13<\/td><td class=\"msi-presenter\">Maurice Roots<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-fb3e671f\" class=\"msi-has-tooltip\" data-abstract=\"As part of the 2023 AGES+ field initiative, a collaborative effort involving AEROME, STAQS, CUPiDS, and other partner campaigns, this study highlights the combined deployments and coordination of TOLNet tropospheric ozone profiles observations over the New York City Metropolitan region. Leveraging ground-based lidars,\u2026\">Synergistic Tropospheric Ozone Observations from Ground-Based, Airborne, and Balloon Platforms during the 2023 AGES+ Campaign<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_C14<\/td><td class=\"msi-presenter\">Jason St. Clair<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a6327632\" class=\"msi-has-tooltip\" data-abstract=\"The utility of ground-based remote sensing of CO2 and CH4 has been well established by the Total Column Carbon Observing Network (TCCON), with its data used for satellite validation, inverse model ground-truthing, and carbon cycle scientific studies. Because TCCON sites are expensive and physically large, their number\u2026\">A new US network for ground-based remote sensing of carbon dioxide, methane, and CO<\/a><\/td><\/tr><\/tbody><\/table><\/div><h2 class=\"msi-session-heading\">Session D: Synergistic use of models with NDACC and its Cooperating Networks\u2019 data to interpret observations and support model development and verification<\/h2><div class=\"msi-schedule\"><table class=\"wp-list-table widefat striped msi-table\"><colgroup><col class=\"msi-col-id\"><col class=\"msi-col-presenter\"><col class=\"msi-col-title\"><\/colgroup><thead><tr><th class=\"msi-id\">ID<\/th><th class=\"msi-presenter\">Presenter<\/th><th>Title<\/th><\/tr><\/thead><tbody><tr class=\"data-row\"><td class=\"msi-id\">K_D01<\/td><td class=\"msi-presenter\">Martyn Chipperfield<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-3b7d20ac\" class=\"msi-has-tooltip\" data-abstract=\"The Network for the Detection of Atmospheric Composition Change (formerly NDSC) has obtained and curated an impressive multi-decadal record of trace gas and aerosol observations from around the globe. The importance of these datasets grows as the continuous timeseries extend and they reveal more information about\u2026\">Combining NDACC data and global 3-D modelling to understand processes, variability and trends in stratospheric composition<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_D01<\/td><td class=\"msi-presenter\">Daniele Minganti<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-21fa8b2a\" class=\"msi-has-tooltip\" data-abstract=\"The Brewer-Dobson Circulation (BDC) is characterized by tropospheric air rising into the stratosphere in the Tropics, moving poleward and descending in the middle and high latitudes. Since the BDC cannot be measured directly, stratospheric long-lived traces (e.g., nitrous oxide, N2O) are used to infer BDC changes. We\u2026\">Understanding stratospheric circulation changes using FTIR measurements<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_D02<\/td><td class=\"msi-presenter\">Ivan Ortega<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-65c46d80\" class=\"msi-has-tooltip\" data-abstract=\"Accurate measurement of atmospheric methane (CH4) and nitrous oxide (N2O) is crucial for understanding their sources, sinks, and environmental significance. High-resolution Fourier Transform Infrared (FTIR) observations, as part of the NDACC\/IRWG network, play a pivotal role in reliable global profiles of these gases.\u2026\">Advancing NDACC\/IRWG FTIR CH4 and N2O retrieval strategies to strengthen atmospheric composition analyses and the evaluation of model simulations and satellite observations<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_D03<\/td><td class=\"msi-presenter\">Beatriz Herrera<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-c40e1353\" class=\"msi-has-tooltip\" data-abstract=\"Atmospheric NH3 is involved in several chemical reactions, including PM formation, with direct consequences for the environment and human health. This work presents the seasonal and diurnal variability and the long-term trends of NH3 total columns retrieved from solar absorption measurements performed at 21\u2026\">NH3 trends and model comparisons at 21 FTIR sites<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_D04<\/td><td class=\"msi-presenter\">Christian Rolf<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-169e4c17\" class=\"msi-has-tooltip\" data-abstract=\"Recent research has shown evidence for water vapor variations in the upper troposphere and lower stratosphere (UTLS) to crucially affect atmospheric circulation and climate. Hence, it is the trends in the UTLS which dominate the climate effect, but water vapor in this region has not been under focus in past research\u2026\">Project overview about the ISSI International Team on upper tropospheric and stratospheric water vapor<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_D05<\/td><td class=\"msi-presenter\">Daniel Rauter<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-1e8c575c\" class=\"msi-has-tooltip\" data-abstract=\"Throughout Europe, long-term ground-based UV irradiation measurements show large regional variations, Solar ultraviolet radiation plays a critical role in human health and ecosystems, with its variability closely linked to changes in atmospheric ozone and other environmental factors. In this study, we analyze nearly\u2026\">Spectral UV Irradiance and Total Ozone Trends in the Austrian Alps and Lowlands: A Multi-Decadal Analysis<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_D06<\/td><td class=\"msi-presenter\">Megan Lickley<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-25e1b8ee\" class=\"msi-has-tooltip\" data-abstract=\"Trends in the atmospheric lifetimes of ozone depleting substances (ODSs) arise from the disequilibrium between ODS mole fractions at the surface relative to those in the loss region. As mole fractions at the surface reach equilibrium, this disequilibrium leads to a decreasing trend in global atmospheric lifetimes of\u2026\">Bias in the use of atmospheric lifetimes for 1-box emissions inference of ozone depleting substances measured at the surface<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_D07<\/td><td class=\"msi-presenter\">Ralf Sussmann<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-29f4a3d0\" class=\"msi-has-tooltip\" data-abstract=\"Solar absorption Fourier transform infrared (FTIR) spectrometry is one of the few techniques that allows for continuous sampling of NOx vertical distributions as a function of the time of the day. Thereby, this kind of observations can help to improve our understanding of daytime photochemistry, validate\u2026\">On daytime increase of stratospheric NOx: New insights from FTIR measurements and photochemistry modeling<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_D01<\/td><td class=\"msi-presenter\">Hyungyu Kang<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-55f4ccd2\" class=\"msi-has-tooltip\" data-abstract=\"This study investigates an ozone intrusion event observed during Pre-Asian Summer Monsoon Chemical &amp; Climate Impact Project (Pre-ACCLIP) in 2021 using consecutive daily ozonesonde measurements. A pronounced enhancement in total column ozone was observed between August 17 and 19, and ozonesonde data revealed that\u2026\">Comparison of Daily Ozonesonde Measurements and Chemical Reanalyses over South Korea Based on 2021 Pre-ACCLIP Data: An Ozone Intrusion Case<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_D02<\/td><td class=\"msi-presenter\">Teaghan Knox<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-b61adba4\" class=\"msi-has-tooltip\" data-abstract=\"The tropopause is the dynamic boundary between the troposphere and stratosphere. It has a wide range of quantitative definitions based on inflection points in temperature and chemical composition. Ozone is abundant in the stratosphere, where it provides important UV shielding, as compared to the troposphere where it\u2026\">Tropopause Trends Over Boulder, Colorado and the Potential Impact on Upper Tropospheric\/Lower Stratospheric Ozone Trends<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_D03<\/td><td class=\"msi-presenter\">Erin McGee<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a00243c0\" class=\"msi-has-tooltip\" data-abstract=\"Short-lived climate forcers, atmospheric species with climate impacts and lifetimes shorter than that of CO2, were a main topic of interest of the 2021 Assessment Report on Impacts of Short-lived Climate Forcers on Arctic Climate, Air Quality, and Human Health by the Arctic Monitoring and Assessment Programme (AMAP).\u2026\">Using NDACC and TCCON to evaluate short-lived climate forcers in the Arctic<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_D04<\/td><td class=\"msi-presenter\">Sieglinde Callewaert<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-c4b7d4c3\" class=\"msi-has-tooltip\" data-abstract=\"High-quality reference observations from networks such as NDACC and TCCON are essential for interpreting atmospheric variability and evaluating the performance of atmospheric models. In this presentation, we highlight recent and ongoing work using WRF-GHG model simulations to investigate methane (CH4) variability over\u2026\">WRF-GHG Simulations of methane (CH\u00e2\u0082\u0084): comparing column-averaged and profile observations over East Asia<\/a><\/td><\/tr><\/tbody><\/table><\/div><h2 class=\"msi-session-heading\">Session E: Linking changes in atmospheric composition, climate, and air quality<\/h2><div class=\"msi-schedule\"><table class=\"wp-list-table widefat striped msi-table\"><colgroup><col class=\"msi-col-id\"><col class=\"msi-col-presenter\"><col class=\"msi-col-title\"><\/colgroup><thead><tr><th class=\"msi-id\">ID<\/th><th class=\"msi-presenter\">Presenter<\/th><th>Title<\/th><\/tr><\/thead><tbody><tr class=\"data-row\"><td class=\"msi-id\">K_E01<\/td><td class=\"msi-presenter\">Susann Tegtmeier<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-6f400f77\" class=\"msi-has-tooltip\" data-abstract=\"Stratospheric trace gases like HCl and N2O show a hemispheric asymmetry, with trends over the last decades having opposing signs in the Northern Hemisphere (NH) and Southern Hemisphere (SH). Some of this difference is due to hemispherically asymmetric changes in the rate of transport by the Brewer-Dobson circulation\u2026\">Long-term changes of the Brewer-Dobson circulation and their impact on stratospheric composition<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_E01<\/td><td class=\"msi-presenter\">Paul A. Newman<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a8f280ce\" class=\"msi-has-tooltip\" data-abstract=\"The Antarctic ozone hole is caused by man-made substances that lead to substantial ozone depletion in the Austral August-October period. Ozone depletion is shut-down as the polar vortex warms during the September-October period. The ozone hole eventually breaks up in the November-December period when total column\u2026\">On the Breakup of the Antarctic Ozone Hole<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_E02<\/td><td class=\"msi-presenter\">Simone Tilmes<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-f5de31d0\" class=\"msi-has-tooltip\" data-abstract=\"With global surface temperatures reaching unprecedented highs and with these continuously increasing detrimental impacts on the Earth system, research on approaches complementary to mitigation and adaptation is required. Stratospheric aerosol injection (SAI) is at the moment one of the more effective technologies\u2026\">The effects of solar climate interventions on the ozone layer, benefits, risks, and uncertainties<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_E03<\/td><td class=\"msi-presenter\">Xin Zhou<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-17ca3e25\" class=\"msi-has-tooltip\" data-abstract=\"The January 2022 eruption of the Hunga volcano (20\u00b0S) injected ~150 Tg of water vapour (~10% of background) into the stratosphere - unprecedented in the satellite era. We use the TOMCAT 3-D chemical transport model, driven by ERA5 reanalyses, to assess the residence time of excess H2O. Simulations with and without\u2026\">Stratospheric Water Vapour Perturbation from the 2022 Hunga Tonga Eruption: Transport and Removal<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_E04<\/td><td class=\"msi-presenter\">Hannah Clark<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-0a518594\" class=\"msi-has-tooltip\" data-abstract=\"For thirty years, the European Research Infrastructure IAGOS (formerly known as MOZAIC) has been equipping commercial aircraft with instruments to monitor the composition of the atmosphere on long-haul flights around the world. Five European aircraft initally measured ozone, and water vapour along with meteorological\u2026\">Long-term measurements of ozone and water vapour from IAGOS aircraft for air-quality and climate<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_E05<\/td><td class=\"msi-presenter\">Sarah Strode<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-fda81d2a\" class=\"msi-has-tooltip\" data-abstract=\"Multiple processes influence the interannual variability and ENSO response of tropospheric ozone and other constituents. These include dynamical changes such as shifts in convection as well as chemical changes due to changes in lightning NOx production and biomass burning emissions. Long time series of ozonesonde data\u2026\">Evaluating Tropospheric Ozone Variability in GEOS-GMI with Ozonesonde Data and Quantifying its Drivers<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_E06<\/td><td class=\"msi-presenter\">Peter Effertz<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-cc9d2c9d\" class=\"msi-has-tooltip\" data-abstract=\"Stratospheric ozone levels have been closely monitored since the signing of the Montreal Protocol which banned ozone-depleting substances (ODS). To assess the effectiveness of the Protocol in driving positive ozone trends, Multiple Linear Regression (MLR) analysis statistical models (i.e. LOTUS,\u2026\">Updated Total Column Ozone trends from Ground-based and satellite records derived using an optimized LOTUS regression model.<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_E07<\/td><td class=\"msi-presenter\">Victoria Flood<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-8e03b349\" class=\"msi-has-tooltip\" data-abstract=\"The University of Toronto Atmospheric Observatory (TAO), has been operating since 2002 and is a member of the Network for the Detection of Atmospheric Composition Change (NDACC). TAO reports partial columns and profiles of 16 trace gases (C2H2, C2H6, CH3OH, CH4, CHF2Cl, CO, H2CO, HCl, HCN, HCOOH, HF, HNO3, N2O, NH3,\u2026\">Utilizing over 20 years of measurements by the University of Toronto Atmospheric Observatory NDACC FTIR to assess air quality and composition<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_E08<\/td><td class=\"msi-presenter\">James Hannigan<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-575e634e\" class=\"msi-has-tooltip\" data-abstract=\"Carbonyl sulfide (OCS) is a non-hygroscopic trace species in the free troposphere and consequently the largest sulfur reservoir maintained by both direct oceanic, geologic, biogenic, and anthropogenic emissions and the oxidation of other sulfur-containing source species. With a relatively long tropospheric lifetime of\u2026\">Revised Long Term Global Carbonyl Sulfide Trends from the NDACC IRWG<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E01<\/td><td class=\"msi-presenter\">Irina Petropavlovskikh<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a07e4dfb\" class=\"msi-has-tooltip\" data-abstract=\"The TOAR-II Harmonization and Evaluation of Ground-based Instruments for Free-Tropospheric Ozone Measurements (HEGIFTOM) project evaluated changes in partial tropospheric ozone columns (&lt;300 hPa) using 2000-2022 globally distributed ozone records using Quantile Regression (QR) and Multiple Linear Regression (MLR)\u2026\">Tropospheric ozone trends at Boulder (2000-2022): Insights from multiple NDACC instruments<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E02<\/td><td class=\"msi-presenter\">Sachiko Okamoto<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-66010164\" class=\"msi-has-tooltip\" data-abstract=\"Since the mid-1980s, stratospheric ozone has been monitored at Observatoire de Haute-Provence (OHP) by a variety of instruments: ozone total column measurements are provided by Dobson and SAOZ spectrometers and ozone vertical distributions are provided by lidar, ozonesonde, and Umkehr measurements. This study provides\u2026\">Ozone trends from ground -based measurements and merged satellite datasets at Observatoire Haute Provence (OHP)<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E03<\/td><td class=\"msi-presenter\">Caroline Jonas<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-e4ec1c64\" class=\"msi-has-tooltip\" data-abstract=\"Polar regions are strategic in the study of stratospheric long-term ozone trends as they are highly impacted by the effective-chlorine levels. The ozone recovery expected from the reduced emissions of ozone depleting substances (Montreal Protocol) should thus be observed most easily there. However, contrary to the\u2026\">Looking for ozone recovery in the Arctic<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E04<\/td><td class=\"msi-presenter\">Abby Scharf<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-79b503af\" class=\"msi-has-tooltip\" data-abstract=\"Ozonesonde observations from the Syowa and the South Pole stations over more than 60 years are described and intercompared. Observations from the two sites reveal remarkable agreement, supporting and extending the understanding gained from either individually. Both sites exhibit extensive Antarctic ozone losses in a\u2026\">Six decades of ozonesonde measurements over Antarctica<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E05<\/td><td class=\"msi-presenter\">Jian Guan<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=human-influence-on-the-ozone-layer-detectable-by-the-1960s\" class=\"msi-has-tooltip\" data-abstract=\"The Antarctic ozone hole was first reported in 1985, and small ozone losses at the global scale were also observed in the late 1980s. The combination of field and laboratory measurements, together with modelling, quickly established anthropogenic chlorofluorocarbons (CFCs) as the cause of both the Antarctic and global\u2026\">Human Influence on the Ozone Layer Detectable by the 1960s<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E06<\/td><td class=\"msi-presenter\">Ja-Ho Koo<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-e812d36b\" class=\"msi-has-tooltip\" data-abstract=\"In this study, we compared ozone vertical profile measured by multiple platforms in the ASIA-AQ campaign: ozonesonde and aircraft (DC-8) in-situ and lidar measurements. In addition, ozone profiles from the satellite dataset (GEMS), chemical transport model (GEOS-Chem), and reanalysis dataset (MERRA-2) were also\u2026\">Wintertime ozone vertical profile patterns in South Korea from multiple data obtained in the ASIA-AQ campaign<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E07<\/td><td class=\"msi-presenter\">Reem Hannun<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-365b4cd1\" class=\"msi-has-tooltip\" data-abstract=\"Tropospheric ozone is a greenhouse gas and air pollutant harmful to human and ecosystem health. While vegetation serves as an important sink for ozone via the process of dry deposition, ozone uptake into the leaf stomata induces oxidative stress that can weaken vegetation carbon assimilation, with cascading impacts on\u2026\">Evaluating Ozone Deposition to Sensitive Ecosystems Using a Fast, High Precision Ozone Instrument<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E08<\/td><td class=\"msi-presenter\">Kevin Joshy<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-338ed916\" class=\"msi-has-tooltip\" data-abstract=\"Since 1999, UV-visible spectroscopic measurements have been made at Eureka, Nunavut, Canada (80.05\u00b0N, 86.42\u00b0W), initially at Environment and Climate Change Canada&#039;s Arctic Stratospheric Ozone Observatory, and since 2005 at the Polar Environment Atmospheric Research Laboratory (PEARL) Ridge Lab. Two UV-visible grating\u2026\">25+ Years of NDACC UV-Visible Measurements at 80\u00b0N<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E09<\/td><td class=\"msi-presenter\">Petra Duff<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-fec279d7\" class=\"msi-has-tooltip\" data-abstract=\"The Polar Environment Atmospheric Research Laboratory (PEARL) at Eureka, Nunavut (80N, 86W) is an NDACC site that has housed a Bruker 125HR Fourier transform infrared (FTIR) spectrometer since 2006. Vertical profiles and columns for twenty trace gases are retrieved using the SFIT4 algorithm. This presentation will\u2026\">NDACC FTIR Measurements of Tropospheric Composition in the Canadian High Arctic<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E10<\/td><td class=\"msi-presenter\">Edgardo I. Sepulveda Araya<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-e923b8a4\" class=\"msi-has-tooltip\" data-abstract=\"Aerosols impact solar radiation in the atmosphere, both directly through attenuation of radiation, and indirectly, by inducing cloud formation. Moreover, studying aerosols in mountainous regions is key due to aerosol deposition and impact on snowpack albedo. For example, deposition of black carbon (BC) transported\u2026\">Characterizing aerosol impact on surface radiation over the Southern Andes, East of Santiago, Chile<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_E11<\/td><td class=\"msi-presenter\">Akriti Masoom<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a0b8041f\" class=\"msi-has-tooltip\" data-abstract=\"NO2 exhibits high spatiotemporal variations having shorter lifetime, with regional confinement near its source. We analyzed the climatological variation of NO2 tropospheric and stratospheric vertical column density (TVCD and SVCD, respectively) using Ozone Monitoring Instrument (OMI) from 2004-2023 and Global Ozone\u2026\">The climatological variation of NO2, its underlying cause and effect on aerosol properties measurements<\/a><\/td><\/tr><\/tbody><\/table><\/div><h2 class=\"msi-session-heading\">Session F: Oases in the desert: Measurements that address the impending gaps in atmospheric data<\/h2><div class=\"msi-schedule\"><table class=\"wp-list-table widefat striped msi-table\"><colgroup><col class=\"msi-col-id\"><col class=\"msi-col-presenter\"><col class=\"msi-col-title\"><\/colgroup><thead><tr><th class=\"msi-id\">ID<\/th><th class=\"msi-presenter\">Presenter<\/th><th>Title<\/th><\/tr><\/thead><tbody><tr class=\"data-row\"><td class=\"msi-id\">K_F01<\/td><td class=\"msi-presenter\">Ross J. Salawitch<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-6705deaa\" class=\"msi-has-tooltip\" data-abstract=\"Data from the ACE-FTS on the Canadian Space Agency SCISAT-1 satellite and MLS instrument on the NASA Aura satellite have played an important role in advancing our understanding of stratospheric composition and the impact of human activity on Earth&#039;s protective ozone layer. Aura will be decommissioned no later than the\u2026\">The Need For Data from NDACC During the Upcoming Satellite-Based, Data Desert of Stratospheric Observations<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_F01<\/td><td class=\"msi-presenter\">Nathaniel J. Livesey<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-dc62f570\" class=\"msi-has-tooltip\" data-abstract=\"The Microwave Limb Sounder (MLS) instrument on NASA&#039;s Aura satellite, launched in 2004, makes daily, near-global, vertically resolved measurements of a range of trace gases from the upper troposphere to the mesosphere, along with observations of temperature, geopotential height, and cloud properties. MLS observations\u2026\">Two decades of observations and science from the Aura Microwave Limb Sounder (MLS)<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_F02<\/td><td class=\"msi-presenter\">Peter Bernath<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-15373686\" class=\"msi-has-tooltip\" data-abstract=\"The ACE satellite (http:\/\/www.ace.uwaterloo.ca\/) [1] is measuring atmospheric composition by solar occultation from low Earth orbit. The primary ACE instrument is an infrared Fourier transform spectrometer (ACE-FTS). The current version of ACE-FTS processing (v5.3) measures 46 molecules including all major species\u2026\">Atmospheric Chemistry Experiment (ACE): Overview<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_F03<\/td><td class=\"msi-presenter\">Martin Mlynczak<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-905256c3\" class=\"msi-has-tooltip\" data-abstract=\"In this presentation, we will introduce the NASA Heliophysics Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) measurements. TIMED mission was launched in 2001 and SABER started continuous measurements in January 2002.\u2026\">NASA SABER\/TIMED measurements in the stratosphere<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_F04<\/td><td class=\"msi-presenter\">Nigel Richards<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a63ea5f9\" class=\"msi-has-tooltip\" data-abstract=\"The Ozone Mapping and Profiler Suite (OMPS) represents the next generation of the U.S. ozone monitoring system and includes current missions (Suomi NPP, NOAA-20, NOAA-21) as well as upcoming ones (JPSS-3 and JPSS-4). The OMPS instrument suite comprises three ozone-measuring sensors - Nadir Mapper (NM), Nadir Profiler\u2026\">Filling the Gap: OMPS LP Ozone Profiles as a Successor to Aura MLS Observations<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_F05<\/td><td class=\"msi-presenter\">Katrin M\u00fcller<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-506b0ad8\" class=\"msi-has-tooltip\" data-abstract=\"The Tropical Western Pacific (TWP) is a critical region for atmospheric chemistry and dynamics, yet continuous ground-based observations have been sparse . As a major entry point for air into the stratosphere during boreal winter, and a region of low tropospheric oxidizing capacity, the TWP plays a key role in\u2026\">The Palau Atmospheric Observatory: A Decade of Monitoring in the Tropical Western Pacific<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_F06<\/td><td class=\"msi-presenter\">Holger V\u00f6mel<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-15f49ca0\" class=\"msi-has-tooltip\" data-abstract=\"Water vapor is one of the most important trace gases in the tropical upper troposphere and stratosphere. Satellite observations provide near global coverage but have low vertical resolution and rely on validation by in situ observations. Only a small number of stations routinely launch sondes that measure\u2026\">20 years of tropical upper tropospheric and stratospheric water vapor monitoring at Costa Rica<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_F07<\/td><td class=\"msi-presenter\">Lyatt Jaegl\u00e9<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-7a760ccc\" class=\"msi-has-tooltip\" data-abstract=\"We will present the Stratosphere Troposphere Response using Infrared Vertically-resolved light Explorer (STRIVE) mission concept, which was recently selected for a competitive Phase A Concept Study within NASA&#039;s 2023 Earth System Explorers Program. STRIVE fills a critical need for high vertical resolution profiles of\u2026\">The STRIVE Earth System Explorer Mission Concept<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">O_F08<\/td><td class=\"msi-presenter\">Ken Jucks<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-a7415191\" class=\"msi-has-tooltip\" data-abstract=\"The atmospheric science community is well aware of the impending end of life for many of the satellites that have formed the backbone of scientific study in the stratosphere. The Aura mission, which contains the Microwave Limb Sounder (MLS), launched in 2004 and will end somewhere in the 2026 to 2028 time period,\u2026\">NDACC after MLS and ACE<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F01<\/td><td class=\"msi-presenter\">Pamela Wales<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-55cbac5f\" class=\"msi-has-tooltip\" data-abstract=\"The MERRA-2 Stratospheric Composition REanalysis with Aura MLS (M2-SCREAM; Wargan et al., 2023) assimilates stratospheric trace gas profiles of O3, N2O, HCl, HNO3, and H2O from the Microwave Limb Sounder (MLS) onboard the Aura satellite. This reanalysis has the benefit of providing vertically resolved fields on a\u2026\">Continuing the Goddard Earth Observing System (GEOS) Composition Reanalysis Beyond Aura MLS<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F02<\/td><td class=\"msi-presenter\">Richard Querel<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-091d76f9\" class=\"msi-has-tooltip\" data-abstract=\"Established in 1961, the Lauder atmospheric research station has continued to evolve over decades.\u00a0 Lauder started with auroral and ionospheric research, and slowly the region of interest moved down in the atmosphere to include stratospheric composition, and UV and solar radiation, and now tropospheric and even\u2026\">Past, present, and future of New Zealand&#8217;s Lauder atmospheric research station<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F03<\/td><td class=\"msi-presenter\">Thierry Leblanc<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-9712dbe5\" class=\"msi-has-tooltip\" data-abstract=\"The initial validation of SMOL-X took place at its home institution (JPL Table Mountain Facility, California) during the NDACC-sponsored campaign STOIC-2024, showing that SMOL-X can measure ozone throughout the lower and mid-stratosphere (up to 36 km) with a precision better than 10% for a time resolution of a few\u2026\">Validation of the Small Mobile Ozone Lidar with eXtended Capability (SMOL-X) measurements during the instrument&#8217;s first NDACC Deployment in Lauder, New Zealand<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F04<\/td><td class=\"msi-presenter\">Justus Notholt<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-989f7ff3\" class=\"msi-has-tooltip\" data-abstract=\"In 1992, the University of Bremen began trace gas observations as part of the NDACC, at that time named NDSC. Currently, we operate four sites, in Bremen (Germany), Ny-\u00c5lesund (Spitsbergen), Orl\u00e9ans (France), and Nicosia (Cyprus). For several years, we have also maintained sites in Paramaribo (Suriname) and Bia\u0142ystok\u2026\">FTIR and microwave trace gas observations by the University of Bremen<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F05<\/td><td class=\"msi-presenter\">Michael D. Himes<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-f9ded96a\" class=\"msi-has-tooltip\" data-abstract=\"Since May 2024, stratospheric water vapor (SWV) measurements have been spatiotemporally limited due to the Aura Microwave Limb Sounder (MLS) SWV product&#039;s reduced coverage to around 6 days per month. Following Aura&#039;s expected decommission next year, SWV measurements will be primarily continued by the Stratospheric\u2026\">A machine learning approach to continue the stratospheric water vapor record using OMPS LP measurements<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F06<\/td><td class=\"msi-presenter\">Henry B. Selkirk<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-e401f87b\" class=\"msi-has-tooltip\" data-abstract=\"Balloonsonde measurements of water vapor with frostpoint hygrometers have been critical for validation of measurements of water vapor from space, and long-term records such as the 40+ year NOAA program at Boulder serve as critical transfer standards between spaceborne instruments. They also are pressed into service to\u2026\">The Role of Frostpoint Measurements of Stratospheric Water Vapor in the Impending Stratospheric &#8216;Data Desert&#8217;<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F07<\/td><td class=\"msi-presenter\">Elizabeth Asher<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-ca86e4f0\" class=\"msi-has-tooltip\" data-abstract=\"Monitoring the abundance of upper tropospheric and lower stratospheric (UTLS) water vapor is vital because its changes on intra-decadal timescales can have radiative impacts of comparable magnitude to increases carbon dioxide, affecting surface temperatures. Yet impending temporal and spatial data gaps in UTLS water\u2026\">Balloon measurements can help address impending UTLS water vapor data gaps<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F08<\/td><td class=\"msi-presenter\">Gerald Nedoluha<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-14e28440\" class=\"msi-has-tooltip\" data-abstract=\"We present H2O measurements of the upper stratosphere and mesosphere since the early 1990&#039;s from NDACC sites in New Zealand, Hawaii, and California. From 1992 to 2005 the ground-based H2O measurements were ~10% higher than the HALOE H2O measurements, but the bias between Aura MLS v5 and the ground-based measurements\u2026\">33 years of ground-based microwave measurements of H2O in the middle atmosphere<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F09<\/td><td class=\"msi-presenter\">Robin Wing<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-9c594a30\" class=\"msi-has-tooltip\" data-abstract=\"Since 2021, the emergence of &quot;Space Age 2.0&quot; has been marked by the rapid deployment of commercial satellite mega-constellations in Low Earth Orbit (LEO). These small, mass-produced satellites are designed for short operational lifetimes and typically re-enter Earth&#039;s atmosphere within 2 to 5 years. Consequently, the\u2026\">Using Resonance Fluorescence Lidars to Monitor Space Debris in the Upper Mesosphere and Lower Thermosphere, Case Study Falcon 9 Re-entry on 19 February 2025<\/a><\/td><\/tr><tr class=\"data-row\"><td class=\"msi-id\">P_F10<\/td><td class=\"msi-presenter\">Jeannette D. Wild<\/td><td><a href=\"https:\/\/ndacc.cas.hamptonu.edu\/?meeting_item=ndacc-c021f05c\" class=\"msi-has-tooltip\" data-abstract=\"The Data Host Facility for the Network for the Detection of Stratospheric Change began operations in 1991, and has offered continuing service for the Network for the Detection of Atmospheric Composition Change. The associated website began in 1994. This poster explores the challenges and successes of serving the\u2026\">The NDACC Database and Web Pages &#8211; 35 years of operations<\/a><\/td><\/tr><\/tbody><\/table><\/div>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This page enables registered attendees to view posters and send and answer questions about presentations. The first time you click on a presentation title, you will be required to login. Those desiring to submit a paper to the NDACC Special issue, send an email using the Symposium contact form with subject &#8216;Scientific Program Committee&#8217;.\u00a0<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":13,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-858","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/ndacc.cas.hamptonu.edu\/index.php?rest_route=\/wp\/v2\/pages\/858","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ndacc.cas.hamptonu.edu\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/ndacc.cas.hamptonu.edu\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/ndacc.cas.hamptonu.edu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ndacc.cas.hamptonu.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=858"}],"version-history":[{"count":16,"href":"https:\/\/ndacc.cas.hamptonu.edu\/index.php?rest_route=\/wp\/v2\/pages\/858\/revisions"}],"predecessor-version":[{"id":4143,"href":"https:\/\/ndacc.cas.hamptonu.edu\/index.php?rest_route=\/wp\/v2\/pages\/858\/revisions\/4143"}],"up":[{"embeddable":true,"href":"https:\/\/ndacc.cas.hamptonu.edu\/index.php?rest_route=\/wp\/v2\/pages\/13"}],"wp:attachment":[{"href":"https:\/\/ndacc.cas.hamptonu.edu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=858"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}