ICARUS Chamber Experiment: 2014 FIXCIT Study_20140110_ALPHA-PINENE/hydrogen peroxide_Hydroxyl radical_No Seed_Alpha-pinene + OH, low NO, dry, (NH4)2SO4 seed at end

Goals:
To observe the low NOx oxidation products from OH + alpha-pinene for comparison to signals which were observed during the SOAS field campaign. Major first generation products should include the hydroxy hydroperoxide of alpha pinene, and pinonaldehyde.

Summary:
The experiment appeared to go well. There was a bit of a SNAFU at the beginning, as it was realized that the chamber exhaust line was still connected about 2-3 minutes after the addition of the alpha-pinene had been started. It was disconnected at this point, however, some of the alpha-pinene may have been lost to the exhaust. However, observations after the alpha-pinene addition was complete and before adding the H2O2, (PTRMS reported 28 ppbv levels of alpha-pinene and CRM OHR reported ~50 s-1 OH reactivity) implied little of the alpha-pinene was lost to the exhaust. Thus, the experiment proceeded as planned. Particle nucleation was observed after about 1.5 hrs of oxidation by the AMS. Peak organic aerosol levels of 25 ug/m^3 were reached after about 3 hrs of oxidation. After ~5hrs of oxidation the lights were turned off, and ammonium sulfate seeds were added to the bag. This caused an increase in OA observed by the AMS.

Organization: 2014 FIXCIT Study
Lab Affiliation: California Institute of Technology
Chamber: Seinfeld chambers

Experiment Category: Gas phase chemical reaction
Oxidant: Hydroxyl radical
Reactants: ALPHA-PINENE, hydrogen peroxide
Reaction Type: Photooxidation
Relative Humidity: 5
Temperature: 27
Pressure: 755

DOI

https://doi.org/10.5065/m1xr-1v29

ICARUS Experiment Details

https://icarus.ucdavis.edu/experiment/396

Temporal Range

2014-01-10 to 2014-01-10

Related Links

Publication - Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds Publication - Mechanism of the hydroxyl radical oxidation of methacryloyl peroxynitrate (MPAN) and its pathway toward secondary organic aerosol formation in the atmosphere Publication - Can Isoprene Oxidation Explain High Concentrations of Atmospheric Formic and Acetic Acid over Forests?

GCMD Science Keywords

• Atmosphere > Aerosols
• Atmosphere > Atmospheric Chemistry > Trace Gases/Trace Species

GCMD Platform Types

• Other > Physical Models > Laboratory > Laboratory

GCMD Instruments

• In Situ/Laboratory Instruments > Chemical Meters/Analyzers

File Media Types

• application/zip

Support Contact

Nguyen, Tran
2014 FIXCIT Study
tbn@ucdavis.edu

Data Curator

GDEX Curator
UCAR/NCAR - GDEX
datahelp@ucar.edu

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Creative Commons Attribution 4.0 International License.

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