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 photoxidation 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 (Exp. #12) compared to the dry experiments. It is possible that the liquid water content under these conditions (?30 vol%) 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

To Access Resource:

Questions? Email Resource Support Contact:

  • Kong, Stephanie
    wkong@caltech.edu
    Caltech Atmospheric Chamber

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

Publication : Mechanism of the hydroxyl radical oxidation of methacryloyl peroxynitrate (MPAN) and its pathway toward secondary organic aerosol formation in the atmosphere
Additional Information N/A
Resource Format Compressed Archive File (application/zip)
Standardized Resource Format Archive
Asset Size N/A
Legal Constraints

Creative Commons Attribution 4.0 International License.
Access Constraints These data are openly accessible by all registered users. Accounts are available free of charge following the registration of user information with a valid email address.
Software Implementation Language N/A

Resource Support Name Kong, Stephanie
Resource Support Email wkong@caltech.edu
Resource Support Organization Caltech Atmospheric Chamber
Distributor N/A
Metadata Contact Name GDEX Curator
Metadata Contact Email gdex@ucar.edu
Metadata Contact Organization UCAR/NCAR - GDEX

Author Seinfeld, John
Publisher ICARUS Community
Publication Date 2023-08-23
Digital Object Identifier (DOI) https://doi.org/10.5065/b9xa-zt95
Alternate Identifier N/A
Resource Version N/A
Topic Category N/A
Progress N/A
Metadata Date 2023-08-23T02:25:51-06:00
Metadata Record Identifier edu.ucar.gdex::242f2a86-eb0a-4191-9f0f-e4aced70689f
Metadata Language eng; USA
Suggested Citation Seinfeld, John. (2023). ICARUS Chamber Experiment: Caltech Atmospheric Chamber_20150130_METHACROLEIN/Methyl nitrite/10102-44-0_Hydroxyl radical_Ammonium sulfate_RH40%. ICARUS Community. https://doi.org/10.5065/b9xa-zt95. Accessed 10 January 2025.

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