ICARUS Chamber Experiment: Nguyen Group_20220520_Nitrogen Dioxide/Ammonium Sulfate/Ozone/Hydrogen Peroxide/alpha-Pinene_Nitrate radical_Ammonium sulfate

Goals:
To quantify SOA yield and gas-phase product yields (particularly of C10 nitrooxy-hydroperoxide and other organonitrates) from humid nighttime RO2+HO2-dominated NO3-initiated chemistry of a-pinene.

Summary:
The chamber was humidified, after which H2O2, NO2, and O3 were injected in the chamber and allowed to equilibrate, forming NO3 and HO2. Ammonium sulfate seed particles were injected. Then a-pinene was injected and decayed by simultaneous reaction with ozone and NO3. Gas phase organics were monitored by CF3O- CIMS (units: normalized counts), particle formation was monitored by SMPS, and RH/T/O3/NOx were monitored throughout.

O3/NOx data sometimes require post-correction not applied here, including subtraction of an ozone interference from H2O2 (1 ppm H2O2 is detected as about 12 ppb ozone) and correction for an in-line HEPA filter (see timeline for applicable timing) that scrubs about 10% of NO2 and 45% of ozone.

CIMS was periodically stopped during this experiment to retune.

Organization: Nguyen Group
Lab Affiliation: UC Davis
Chamber: Tran's big bag of air

Experiment Category: Gas phase chemical reaction, Aerosol formation
Oxidant: Nitrate radical
Reactants: Nitrogen Dioxide, Ammonium Sulfate, Ozone, Hydrogen Peroxide, alpha-Pinene
Reaction Type: Dark oxidation
Relative Humidity: 66
Temperature: 22
Seed Name: Ammonium sulfate
Pressure: approx 1 atm

DOI

https://doi.org/10.5065/tehv-st82

ICARUS Experiment Details

https://icarus.ucdavis.edu/experiment/870

Temporal Range

2022-05-20 to 2022-05-20

Related Links

N/A

GCMD Science Keywords

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

GCMD Instruments

• In Situ/Laboratory Instruments > Chemical Meters/Analyzers

File Media Types

• application/zip

Support Contact

Bates, Kelvin
Nguyen Group
kelvinhbates@gmail.com

Data Curator

GDEX Curator
UCAR/NCAR - GDEX
gdex@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.

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