edu.ucar.gdex::d789019 eng; USA utf-8 dataset NSF NCAR Geoscience Data Exchange datahelp@ucar.edu https://gdex.ucar.edu NSF NCAR Geoscience Data Exchange The Geoscience Data Exchange (GDEX), managed by the Computational and Information Systems Laboratory (CISL) at NSF NCAR, contains a large collection of meteorological, atmospheric composition, and oceanographic observations, and operational and reanalysis model outputs, integrated with NSF NCAR High Performance Compute services to support atmospheric and geosciences research. download pointOfContact 2025-06-18T19:43:21Z ISO 19115 Geographic Information - Metadata ISO19115:2003/Cor 1 2006 https://doi.org/10.5065/7jms-yd38 https://doi.org/10.5065/7jms-yd38 https Related Resource #1 ICARUS Dataset at UC-Davis ICARUS Chamber Experiment: 2014 FIXCIT Study_20140124_4-hydroxy-3-nitrooxy ISOPN/Methyl nitrite/nitric oxide/_Hydroxyl radical_Ammonium sulfate_4,3-isoprene hydroxynitrate + OH, high NO, 50% RH, (NH4)2SO4 seed d789019 2021-10-12 publication Wennberg, Paul O. author Seinfeld, John H. author Crounse, John D. author Nguyen, Tran B. author NSF National Center for Atmospheric Research publisher Goals: To observe the products of 4-OH-3-ONO2-ISOPN + OH oxidation in the presence of wet ammonium sulfate seeds. In particular, we would like to achieve a constraint on the yield of the dihydroxydinitrate (DHDN) product. In addition to DHDN, expected products include C4-hydroxy-carbonyl nitrate (MVKN, MW = 149), formaldehyde, hydroxyacetone, and glycolaldehyde. We also explored GTHOS OH interference at the end of the experiment. We conclusively saw increasing interference once NO was titrated out of the bag, and significant amounts of ozone were present. It scaled with ozone addition. Summary: John Crounse successfully separated most of the hexanes/ethyl acetate from a synthesized sample of 4,3 ISOPN. RH was added to the bag to 55%. GHTOS managed to grab a humid background, which is key. Isoprene hydroxy nitrate was successfully added to the bag. No impurities were noticed on the GC from the 4,3 ISOPN standard. Lights were turned on (we should do it off-hour so that NO-CL can measure right when lights turn on/off). Mostly the methylvinylketone nitrate (MVKN, MW = 149) was made. AMS noticed about 4 ug/m^3 of organic mass, and TD-LIF reported ~70ppt of aerosol particles. After about 2 hours, oxidation significantly slowed down. When 100% lights on, oxidation sped up a bit, but leveled off, as did NO concentration, indicating a lack of OH. Potentially significant photolysis of M-234 was noticed. When lights were turned off, everything stabilized. There was enough NO to completely titrate the roughly 20ppb O3 that had formed during the experiment. After lights off, multiple levels of O3 were added to the bag to explore the OH interference question. Organization: 2014 FIXCIT Study Lab Affiliation: California Institute of Technology Chamber: Seinfeld chambers Experiment Category: Gas phase chemical reaction, Aerosol formation Oxidant: Hydroxyl radical Reactants: 4-hydroxy-3-nitrooxy ISOPN, Methyl nitrite, nitric oxide Reaction Type: Photooxidation Relative Humidity: 52 Temperature: 26 Seed Name: Ammonium sulfate Pressure: 750 Torr completed datahelp@ucar.edu pointOfContact notPlanned dataset https://gdex.ucar.edu/images/ds_logos/default_200_200.png Logo thumbnail from URL png ASCII dataset Resource Type 2021-03-30 revision 4.4 DataCite Metadata Working Group orginator resourceTypeGeneral LABORATORY > LABORATORY U.S. National Aeronautics and Space Administration Global Change Master Directory GCMD 2026-02-27 revision 23.4 NASA Global Change Master Directory orginator Valids List: Platforms ICARUS > Integrated Chamber Atmospheric data Repository for Unified Science U.S. National Aeronautics and Space Administration Global Change Master Directory GCMD 2026-02-27 revision 23.4 NASA Global Change Master Directory orginator Valids List: Projects EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > TRACE GASES/TRACE SPECIES U.S. National Aeronautics and Space Administration Global Change Master Directory GCMD 2026-02-27 revision 23.4 NASA Global Change Master Directory orginator Valids List: Science and Services Keywords Creative Commons Attribution 4.0 International License None eng utf-8 environment 2014-01-24 2014-01-24 NSF NCAR Geoscience Data Exchange datahelp@ucar.edu https://gdex.ucar.edu distributor 2.619 https://gdex.ucar.edu/datasets/d789019/ https Dataset Description Related Link information https://gdex.ucar.edu/datasets/d789019/dataaccess/ https Data Access Related Link download none asNeeded