Temporal variation of aerosol properties at a rural continental site and study of aerosol evolution through growth law analysis

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Read Full Article (file size: 5882325 bytes) Cited by JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111, D18203, doi:10.1029/2005JD006704, 2006 Temporal variation of aerosol properties at a rural continental site and study of aerosol evolution through growth law analysis Jian Wang Atmospheric Science Division, Brookhaven National Laboratory, Upton, New York, USA Don Collins Department of Atmospheric Sciences, Texas A&M University, College Station, Texas, USA David Covert Department of Atmospheric Sciences, University of Washington, Seattle, Washington, USA Robert Elleman Department of Atmospheric Sciences, University of Washington, Seattle, Washington, USA Richard A. Ferrare NASA Langley Research Center, Hampton, Virginia, USA Roberto Gasparini Department of Atmospheric Sciences, Texas A&M University, College Station, Texas, USA Haflidi Jonsson Naval Postgraduate School, Monterey, California, USA John Ogren Global Monitoring Division, Earth System Research Laboratory, NOAA, Boulder, Colorado, USA Patrick Sheridan Global Monitoring Division, Earth System Research Laboratory, NOAA, Boulder, Colorado, USA Si-Chee Tsay NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Abstract Aerosol size distributions were measured by a Scanning Mobility Particle Sizer (SMPS) on board the CIRPAS Twin Otter aircraft during 16 flights at the Southern Great Plains (SGP) site in northern central Oklahoma as part of the Aerosol Intensive Operation period in May 2003. During the same period a second SMPS was deployed at a surface station and provided continuous measurements. Combined with trace gas measurements at the SGP site and back trajectory analysis, the aerosol size distributions provided insights into the sources of aerosols observed at the SGP site. High particle concentrations, observed mostly during daytime, were well correlated with the sulfur dioxide (SO₂) mixing ratios, suggesting nucleation involving sulfuric acid is likely the main source of newly formed particles at the SGP. Aerosols within plumes originating from wildfires in Central America were measured at the surface site. Vertically compact aerosol layers, which can be traced back to forest fires in East Asia, were intercepted at altitudes over 3000 m. Analyses of size-dependent particle growth rates for four periods during which high cloud coverage was observed indicate growth dominated by volume controlled reactions. Sulfate accounts for 50% to 72% of the increase in aerosol volume concentration; the rest of the volume concentration increase was likely due to secondary organic species. The growth law analyses and meteorological conditions indicate that the sulfate was produced mainly through aqueous oxidation of SO₂ in clouds droplets and hydrated aerosol particles. Received 23 September 2005; accepted 13 June 2006; published 23 September 2006. Keywords: growth law analysis; wildfires; aqueous sulfate production. Index Terms: 0305 Atmospheric Composition and Structure: Aerosols and particles (0345, 4801, 4906); 0365 Atmospheric Composition and Structure: Troposphere: composition and chemistry; 3307 Atmospheric Processes: Boundary layer processes; 3311 Atmospheric Processes: Clouds and aerosols. Read Full Article (file size: 5882325 bytes) Cited by Citation: Wang, J., D. Collins, D. Covert, R. Elleman, R. A. Ferrare, R. Gasparini, H. Jonsson, J. Ogren, P. Sheridan, and S.-C. Tsay (2006), Temporal variation of aerosol properties at a rural continental site and study of aerosol evolution through growth law analysis, J. Geophys. Res., 111, D18203, doi:10.1029/2005JD006704. Copyright 2006 by the American Geophysical Union.

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