2014 Progress Report: Understanding regional oxidation capacity by comprehensive observations to constrain hydroxyl radical sources and sinks during the Southern Oxidant Aerosol Study (SOAS)

EPA Grant Number: R835400
Title: Understanding regional oxidation capacity by comprehensive observations to constrain hydroxyl radical sources and sinks during the Southern Oxidant Aerosol Study (SOAS)
Investigators: Kim, Saewung
Institution: University of California - Irvine
EPA Project Officer: Hunt, Sherri
Project Period: April 1, 2013 through March 31, 2016
Project Period Covered by this Report: April 1, 2014 through April 30,2015
Project Amount: $299,895
RFA: Anthropogenic Influences on Organic Aerosol Formation and Regional Climate Implications (2012) RFA Text |  Recipients Lists
Research Category: Air Quality and Air Toxics , Global Climate Change , Climate Change , Air

Objective:

  • Providing high-resolution datasets of OH, HO2+RO2, H2SO4, NOx, and OH reactivity to the SOAS study participants and the entire scientific community. 
  • Constraining OH sources including photolytic and recycling sources and OH chemical sinks by measurements.
  • Understanding HOx budget and implications for SOA production by comparing measured OH ([OH]MEA), measurement constrained steady-state model calculated OH ([OH]SS) and University of Washington Chemical Mechanism (UWCM), which embedded the near-explicit chemical mechanism (MCM 3.2) calculated OH ([OH]UWCM) to assess our current HOx and SOA modeling capacity in isoprene rich environments for various NOx levels. 

Progress Summary:

  • Intercomparing OH observations with the Brune group at Penn State using a laser induced fluorescence (LIF) technique.
  • Intercomparing OH reactivity observations with the Brune group at Penn State using a LIF technique.
  • Evaluating VOC datasets from different analytical techniques (e.g., GC-­MS and PTR-ToF-­MS) to quantitatively interpret missing OH reactivity.
  • Establishing a box-model framework to evaluate importance of stabilized Criegee radical reaction channel in gas-phase H2SO4 production.

Future Activities:

  • Working on a collaborative publication with the Brune group to examine OH level in the Southeastern U.S.
  • Working on a collaborative publication to comprehensively evaluate the source for missing OH reactivity including potential bias between the OH reactivity techniques and among the trace gas observational techniques especially for VOCs.
  • Working on a collaborative publication to quantitatively examine gas phase H2SO4 production channel in the Southeastern U.S. 


Journal Articles on this Report : 1 Displayed | Download in RIS Format

Other project views: All 5 publications 1 publications in selected types All 1 journal articles
Type Citation Project Document Sources
Journal Article Lee BH, Mohr C, Lopez-Hilfiker FD, Lutz A, Hallquist M, Lee L, Romer P, Cohen RC, Iyer S, Kurten T, Hu W, Day DA, Campuzano-Jost P, Jimenez JL, Xu L, Ng NL, Guo H, Weber RJ, Wild RJ, Brown SS, Koss A, de Gouw J, Olson K, Goldstein AH, Seco R, Kim S, McAvey K, Shepson PB, Starn T, Baumann K, Edgerton ES, Liu J, Shilling JE, Miller DO, Brune W, Schobesberger S, D'Ambro EL, Thornton JA. Highly functionalized organic nitrates in the southeast United States: contribution to secondary organic aerosol and reactive nitrogen budgets. Proceedings of the National Academy of Sciences of the United States of America 2016;113(6):1516-1521. R835400 (2014)
R835400 (Final)
R835403 (2015)
R835403 (Final)
R835407 (Final)
R835410 (2013)
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  • Supplemental Keywords:

    ambient air, tropospheric OH, SOA, observation, Southeast 

    Progress and Final Reports:

    Original Abstract
    2013 Progress Report
    Final Report