ICARUS Chamber Experiment: Caltech Atmospheric Chamber_20150130_METHACROLEIN/Methyl nitrite/10102-44-0_Hydroxyl radical_Ammonium sulfate_RH40%

Goals: This experiment was done to study the Methacrolein high NO2 photooxidation in the presence of wet ammonium sulfate (AS) seeds at RH 40%, since the other experiments were done at low RH and without seed particles. The hypothesis is that particle liquid water will decrease SOA formation because water will hydrolyze HMML instead of allowing it to oligomerize on the particle surface. This liquid water is also hypothesized to liberate 2-methylgycleric acid (2MGA) from the aerosol to the gas phase. Summary: Interestingly, gas-phase 2MGA is not significantly enhanced and aerosol mass is not significantly decreased in the 40% RH experiment (Experiment #12) compared to the dry experiments. It is possible that the liquid water content under these conditions (30% by volume) is not high enough to dominate the reaction with HMML or there is a barrier to 2MGA volatilization. We do see the hypothesis confirmed in the fully deliquesced particle in the 85% RH experiment (150208) Organization: Caltech Atmospheric Chamber Lab Affiliation: California Institute of Technology, Pasadena, CA Chamber: Near/Far Bag 2012-2015 (Tran) Experiment Category: Gas phase chemical reaction, Aerosol formation Oxidant: Hydroxyl radical Reactants: METHACROLEIN, Methyl nitrite, 10102-44-0 Reaction Type: Photooxidation Relative Humidity: 40 Temperature: 25 Seed Name: Ammonium sulfate Pressure: 750 Torr

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Temporal Range

  • Begin:  2015-01-30
    End:  2015-01-30

Keywords

Resource Type dataset
Temporal Range Begin 2015-01-30
Temporal Range End 2015-01-30
Temporal Resolution N/A
Bounding Box North Lat N/A
Bounding Box South Lat N/A
Bounding Box West Long N/A
Bounding Box East Long N/A
Spatial Representation N/A
Spatial Resolution N/A
Related Links

Related Resource #1 : Icarus Dataset at UC-Davis
Additional Information N/A
Resource Format ASCII
Standardized Resource Format ASCII
Asset Size 176.243 MB
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Creative Commons Attribution 4.0 International License
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Resource Support Email datahelp@ucar.edu
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Distributor NSF NCAR Geoscience Data Exchange
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Metadata Contact Email datahelp@ucar.edu
Metadata Contact Organization NSF NCAR Geoscience Data Exchange

Author Seinfeld, John H.
Publisher NSF National Center for Atmospheric Research
Publication Date 2023-08-23
Digital Object Identifier (DOI) https://doi.org/10.5065/b9xa-zt95
Alternate Identifier d789109
Resource Version N/A
Topic Category environment
Progress completed
Metadata Date 2025-10-09T01:35:38Z
Metadata Record Identifier edu.ucar.gdex::d789109
Metadata Language eng; USA
Suggested Citation Seinfeld, John H.. (2023). ICARUS Chamber Experiment: Caltech Atmospheric Chamber_20150130_METHACROLEIN/Methyl nitrite/10102-44-0_Hydroxyl radical_Ammonium sulfate_RH40%. NSF National Center for Atmospheric Research. https://doi.org/10.5065/b9xa-zt95. Accessed 11 October 2025.

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