Final Report: Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Cal Tech Report

EPA Grant Number: R826371C003
Subproject: this is subproject number 003 , established and managed by the Center Director under grant R826371
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).

Center: Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States
Center Director: Seinfeld, John
Title: Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Cal Tech Report
Investigators: Seinfeld, John
Institution: California Institute of Technology
EPA Project Officer: Shapiro, Paul
Project Period: April 15, 1998 through April 14, 2003
RFA: Special Opportunity in Tropospheric Ozone (1997) RFA Text |  Recipients Lists
Research Category: Air Quality and Air Toxics , Air

Objective:

This is one of the research projects conducted by the Research Consortium. The objectives of this research project were to: (1) improve the treatment of secondary organic aerosols (SOAs) in atmospheric models; (2) improve the numerical aspects of three-dimensional air quality models; (3) develop the most advanced version of a three-dimensional urban scale model for ozone and particulate matter (PM); and (4) apply that model to the South Coast Air Basin of California (SoCAB). Each of these objectives was achieved (Griffin, et al., 2002 a and b; Pun, et al., 2002).

Summary/Accomplishments (Outputs/Outcomes):

A model that predicts SOA formation based on the thermodynamic equilibrium partitioning of secondary organic oxidation products has been developed for implementation into atmospheric models (Part II). Hydrophobic secondary products are assumed to partition to an absorbing organic aerosol consisting of primary organic aerosol and other secondary hydrophobic organics, according to an equilibrium partitioning coefficient calculated iteratively for each secondary compound present.

In Part III, the California Institute of Technology’s (CIT) three-dimensional urban/regional atmospheric model was used to perform comprehensive gas- and aerosol-phase simulations of the September 8, 1993, smog episode in the SoCAB using the atmospheric chemical mechanism of Part I (Griffin, et al., 2002) and the thermodynamic module of Part II (Pun, et al., 2002). This paper primarily focuses on simulations of SOAs and determination of the species and processes that lead to this SOA. Meteorological data and a gas and particulate emissions inventory for this episode were supplied directly by the South Coast Air Quality Management District. A summer 1993 atmospheric sampling campaign provided data against which the performance of the model was evaluated. Predictions indicated that SOA formation in the SoCAB is dominated by partitioning of hydrophobic secondary products of the oxidation of anthropogenic organics. The biogenic contribution to total SOA increases in the more rural eastern portions of the region, as does the fraction of hydrophilic SOA, the latter reflecting the increasing degree of oxidation of SOA species with atmospheric residence time.


Journal Articles on this Report : 6 Displayed | Download in RIS Format

Other subproject views: All 6 publications 6 publications in selected types All 6 journal articles
Other center views: All 49 publications 46 publications in selected types All 46 journal articles
Type Citation Sub Project Document Sources
Journal Article Clegg SL, Seinfeld JH, Brimblecombe P. Thermodynamic modelling of aqueous aerosols containing electrolytes and dissolved organic compounds. Journal of Aerosol Science 2001;32(6):713-738. R826371 (Final)
R826371C003 (Final)
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  • Journal Article Griffin RJ, Dabdub D, Seinfeld JH. Secondary organic aerosol 1. Atmospheric chemical mechanism for production of molecular constituents. Journal of Geophysical Research 2002;107(D17):4332 (26 pp.). R826371 (Final)
    R826371C003 (Final)
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  • Journal Article Griffin RJ, Dabdub D, Kleeman MJ, Fraser MP, Cass GR, Seinfeld JH. Secondary organic aerosol 3. Urban/regional scale model of size-and composition-resolved aerosols. Journal of Geophysical Research: Atmospheres 2002;107(D17):4334 (14 pp.). R826371 (Final)
    R826371C003 (Final)
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  • Journal Article Pankow JF, Seinfeld JH, Asher WE, Erdakos GB. Modeling the formation of secondary organic aerosol. 1. Application of theoretical principles to measurements obtained in the α-pinene/, β-pinene/, sabinene/, Δ3-carene/, and cyclohexene/ozone systems. Environmental Science & Technology 2001;35(6):1164-1172. R826371 (Final)
    R826371C003 (Final)
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  • Journal Article Pun BK, Griffin RJ, Seigneur C, Seinfeld JH. Secondary organic aerosol 2. Thermodynamic model for gas/particle partitioning of molecular constituents. Journal of Geophysical Research-Atmospheres 2002;107(D17):4333 (15 pp.). R826371 (Final)
    R826371C003 (Final)
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  • Journal Article Seinfeld JH, Erdakos GB, Asher WE, Pankow JF. Modeling the formation of secondary organic aerosol (SOA). 2. The predicted effects of relative humidity on aerosol formation in the α-pinene-, β-pinene-, Sabinene-, Δ3-carene-, and cyclohexene-ozone systems. Environmental Science & Technology 2001;35(9):1806-1817. R826371 (Final)
    R826371C003 (Final)
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  • Supplemental Keywords:

    secondary organic aerosols, SOAs, primary organic aerosols, atmospheric models, atmospheric residence time, air quality models., RFA, Scientific Discipline, Air, Ecosystem Protection/Environmental Exposure & Risk, particulate matter, Environmental Chemistry, Monitoring/Modeling, Analytical Chemistry, tropospheric ozone, Atmospheric Sciences, secondary aerosol formation, atmospheric dispersion models, aerosol formation, atmospheric particulate matter, fine particles, three dimensional air flow modeling, secondary organic aerosols, ozone, fine particulates, airborne particulate matter, chemical composition, air sampling, air pollution models, air quality model, atmospheric aerosol particles, California, three dimensional model, aersol particles, aerosol analyzers, air quality, atmospheric chemistry, fine particle formation

    Progress and Final Reports:

    Original Abstract
  • 1998
  • 1999
  • 2000
  • 2001

  • Main Center Abstract and Reports:

    R826371    Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States

    Subprojects under this Center: (EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
    R826371C001 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Cal Tech, UC-Riverside, UC-San Diego, UC-Davis Report
    R826371C002 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Cal Tech, Carnegie Mellon, Georgia Institute, NJIT, Oregon Institute, UC-Irvine, UC-Riverside Report
    R826371C003 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Cal Tech Report
    R826371C004 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: California - Irvine Report
    R826371C005 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Carnegie Mellon Report
    R826371C006 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Carnegie Mellon Report
    R826371C007 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: UC-Riverside
    R826371C008 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: Oregon Health and Science Report
    R826371C009 Research Consortium on Ozone and Fine Particle Formation in California and in the Northeastern United States: NJIT Report