ICARUS Chamber Experiment: 2014 FIXCIT Study_20140113_ALPHA-PINENE/nitric oxide/OZONE/formaldehyde_Nitrate radical_Ammonium sulfate_HO2 fate, dry RH, seed added at end

Goals:
Study alpha-pinene + NO3 chemistry by injecting 150 ppb NO2 & 75 ppb O3, plus HCHO. Run the experiment so as to optimize for the formation of the nitrooxyhydroperoxide (MW = 231), which we detected during SOAS and to prevent the dominance of RO2 + RO2 reactions. We will see if we can better understand the gas phase nitrate yields from alpha-pinene nighttime chemistry when we run the experiment in a more atmospherically relevant way than has been done in the past. We will also inject ammonium sulfate seed at the end of the experiment to see, which and to what degree, the gas phase nitrates partition into the particle phase.

Summary:
We formed a very high yield of nitrooxyhydroperoxide. In fact most of the other masses detected by the CF3O- CIMS were significantly smaller. After the nitrooxyhydroperoxide signal began to level out, we ramped the temperature to determine if any species came off the walls. The signal for the nitrooxyhydroperoxide and other signals did increase, but not substantially. We then cooled the chamber and injected seed. There was uptake seen by the AMS (~10 ug/m^3). At the very end we turned on lights, and saw the nitrooxyhydroperoxide signal increase instead of decay. There was still alpha-pinene left unreacted at this point as confirmed via the PTR-MS. O3 increased to around ~500 ppb over only 30 minutes after lights turned on, so likely this provided enough NO3 to be competitive with OH.

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

Experiment Category: Gas phase chemical reaction
Oxidant: Nitrate radical
Reactants: ALPHA-PINENE, nitric oxide, OZONE, formaldehyde
Reaction Type: Dark oxidation
Relative Humidity: 5
Temperature: 25
Seed Name: Ammonium sulfate
Pressure: 755

DOI

https://doi.org/10.5065/bj92-0x12

ICARUS Experiment Details

https://icarus.ucdavis.edu/experiment/95

Temporal Range

2014-01-13 to 2014-01-13

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

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.

Full Metadata

DIF XML
ISO19139 XML
OAI DC
JSON-LD

Version History

20211012-015052

20210930-015029

20210923-015013

20210921-015011

20210919-015009

20210824-015011

20210805-015011

20210802-015011

20210731-015011

20210730-015011

20210729-015011

20210725-015010

20210720-015018

20210717-015010

20201204-171954