edu.ucar.gdex::d789030 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 2025-06-19T17:47:07Z ISO 19115 Geographic Information - Metadata ISO19115:2003/Cor 1 2006 https://doi.org/10.5065/9awv-4t43 https://doi.org/10.5065/9awv-4t43 https Related Resource #1 ICARUS Dataset at UC-Davis ICARUS Chamber Experiment: 2014 FIXCIT Study_20140130_PINONALDEHYDE/Pinonic acid/Methyl nitrite_Hydroxyl radical_No Seed_Pinonaldehyde + OH, moderate NO, dry, no seeds d789030 2021-10-07 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: Explore the gas-phase chemistry of pinonaldehyde when HO2, NO, and NO2 are all present. Summary: Synthesized pinonaldehyde was added through a heated line for a few hours to get enough into the bag. This was the first time we had injected pinonaldehyde and learned that next time, we shouldn't heat the injection line or the bulb because that facilitates the oxidation of pinonaldehyde to pinonic acid. Thus both were injected at initial mixing ratios of ~15 ppb (with a fair amount of uncertainty) to ~10 to 20 ppb pinonic acid (also with uncertainty). The pinonic acid is expected to react with OH about 4 times slower than pinonaldehyde, although there is a channel for the production of pinonic acid from the pinonaldehyde photooxidation as well. After initiating OH oxidation by methyl nitrite photolysis, CF3O- CIMS observed that almost all of the carbon ended up as the PAN of pinonaldehyde (which Geoff calls "PiPAN"). Perhaps due to the high formation of the PiPAN, we observed high amounts of nucleated organic aerosol (~40 ug/m^3 at the end of the experiment). At the end of the experiment, most of the pinonaldehyde was gone, but more than half of the pinonic acid was left (perhaps because it's produced as well as lost through OH oxidation). We injected methyl nitrite twice, to replenish the OH. At the end, lights were turned off and the bag was flushed within 20 minutes. Organization: 2014 FIXCIT Study Lab Affiliation: California Institute of Technology Chamber: Seinfeld chambers Experiment Category: Gas phase chemical reaction Oxidant: Hydroxyl radical Reactants: PINONALDEHYDE, Pinonic acid, Methyl nitrite Reaction Type: Photooxidation Relative Humidity: 5 Temperature: 26 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 2014-01-30 2014-01-30 NSF NCAR Geoscience Data Exchange datahelp@ucar.edu https://gdex.ucar.edu distributor 1.99 https://gdex.ucar.edu/datasets/d789030/ https Dataset Description Related Link information https://gdex.ucar.edu/datasets/d789030/dataaccess/ https Data Access Related Link download none asNeeded