Temporal variation of aerosol properties at a rural continental site and study of aerosol evolution through growth law analysis
Author
Wang, Jian
Collins, Don
Covert, David
Elleman, Robert
Ferrare, Richard A.
Gasparini, Roberto
Jonsson, Haflidi
Ogren, John
Sheridan, Patrick
Tsay, Si-Chee
Date
2006Metadata
Show full item recordAbstract
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.
Description
Journal of Geophysical Research, Vol. 111, D18203 doi:10.1029/2005JD006704, 2006.
The article of record as published may be located at http://dx.doi.org/10.1029/2005JD006704
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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