10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Measurements of Dry and Wet Black Carbon Deposition over a Grassland
GAVIN MCMEEKING, Ethan Emerson, Joseph Katich, Joshua P. Schwarz, Delphine Farmer, Handix Scientific
Abstract Number: 1035 Working Group: Carbonaceous Aerosol
Abstract The atmospheric lifetime of black carbon (BC), an important light-absorbing aerosol component, is controlled by wet and dry deposition, which are poorly constrained by observations. We apply a single particle soot photometer (SP2), which measures the mass of refractory BC in particles using laser-induced incandescnce, to measure surface-atmospheric exchanges of BC via eddy covariance. Measurements were performed at the DOE ARM Southern Great Plains site in Oklahoma during summer. Wet deposition measurements of BC were also performed by analyzing collected precipitation samples through a combination of nebulization followed by SP2 measurement. We report on the relative importance of dry and wet deposition processes during the study, and estimate a BC lifetime with respect to each process. Additional eddy covariance measurements performed in other locations are also discussed.