ICARUS Chamber Experiment: 2014 FIXCIT Study_20140106_Isoprene/Ozone/Water_Hydroxyl radical_No Seed_Isoprene + OH + O3, low NO, dry, no seeds

Goals: Explore OH yield, product formation (carbonyls, peroxides, organic acids, and others), and Ozone-related GTHOS interference. Investigate any instrumental interferences of high ozone levels.

Summary: Experiment went well, lots of products were made, both by OH and O3 + isoprene chemistry. A significant amount of the isoprene mass was converted to hydroxymethylhydroperoxide (HMHP) at this RH, as expected based on previous CIT measurements. Experiment time was shorter than hoped, due to bag volume depleting too quickly. LIF OHR instrument was taken off bag at 1.5 h mark to conserve bag volume. The "end" of the experiment was when CF3O- CIMS saw that product formation stabilized and when PTRMS and GC-FID saw that isoprene was all gone - this happened at approximately 16:15. At reaction end (although it's technically still going in the bag), we did a test for some instruments to see if sampling directly from a port into the chamber gives the same answer as from a common sampling line. For I/A CIMS, CF3O- CIMS, and PTRMS, there does not appear to be significant differences. For O3/NOx, there appears to be a difference in the beginning of sampling, and these instruments now will be on their own line when O3 measurements are more critical. AMS reports losing ~ 30% of particle mass through a longer inlet. GC-FID tested out trapping methods, with limited success but will continue to work on it. The flow rate through LIF OHR was higher than expected, but this will be worked on tomorrow when this instrument will be off. At the end of the experiment, UV lights were also turned on at 100% for ~40 min. Photolysis of some species seen by CF3O- CIMS was observed. CRM OHR was not on the bag today, but at the end of the day reported success in measuring OHR of pyrrole and expects to be on tomorrow. Preparations for upcoming experiment, starting this evening, started approximately 19:00.

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

Experiment Category: Gas phase chemical reaction Oxidant: Hydroxyl radical Reactants: Isoprene, Ozone, Water Reaction Type: Photooxidation Relative Humidity: 5 Temperature: 25 Seed Name: No Seed Pressure: 750 Torr

To Access Resource:

Questions? Email Resource Support Contact:

  • Nguyen, Tran
    tbn@ucdavis.edu
    2014 FIXCIT Study

Temporal Range

  • Begin:  2014-01-06
    End:  2014-01-06

Keywords

Resource Type dataset
Temporal Range Begin 2014-01-06
Temporal Range End 2014-01-06
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 : Overview of the Focused Isoprene eXperiment at the California Institute of Technology (FIXCIT): mechanistic chamber studies on the oxidation of biogenic compounds

Publication : Atmospheric fates of Criegee intermediates in the ozonolysis of isoprene

Publication : Can Isoprene Oxidation Explain High Concentrations of Atmospheric Formic and Acetic Acid over Forests?
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Resource Format Compressed Archive File (application/zip)
Standardized Resource Format Archive
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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.
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Resource Support Name Nguyen, Tran
Resource Support Email tbn@ucdavis.edu
Resource Support Organization 2014 FIXCIT Study
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Metadata Contact Name GDEX Curator
Metadata Contact Email gdex@ucar.edu
Metadata Contact Organization UCAR/NCAR - GDEX

Author Wennberg, Paul
Seinfeld, John
Crounse, John
Nguyen, Tran
Publisher ICARUS Community
Publication Date 2023-08-23
Digital Object Identifier (DOI) https://doi.org/10.5065/pfd3-mp33
Alternate Identifier N/A
Resource Version N/A
Topic Category N/A
Progress N/A
Metadata Date 2023-08-23T01:51:36-06:00
Metadata Record Identifier edu.ucar.gdex::12fa7f0e-f1bd-4ea9-ba40-1ce9b0803f19
Metadata Language eng; USA
Suggested Citation Wennberg, Paul, Seinfeld, John, Crounse, John, Nguyen, Tran. (2023). ICARUS Chamber Experiment: 2014 FIXCIT Study_20140106_Isoprene/Ozone/Water_Hydroxyl radical_No Seed_Isoprene + OH + O3, low NO, dry, no seeds. ICARUS Community. https://doi.org/10.5065/pfd3-mp33. Accessed 10 January 2025.

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