Biomass Burning Plumes in the Vicinity of the California Coast: Airborne Characterization of Physicochemical Properties, Heating Rates, and Spatiotemporal Features
AuthorMardi, Ali Hossein
MacDonald, Alexander B.
Braun, Rachel A.
Thorsen, Tyler J.
Coggon, Matthew M.
Fenn, Marta A.
Ferrare, Richard A.
Hair, Johnathan W.
Woods, Roy K.
Jonsson, Haflidi H.
Flagan, Richard C.
Seinfeld, John H.
AffiliationUniv Arizona, Dept Chem & Environm Engn
Univ Arizona, Dept Hydrol & Atmospher Sci
MetadataShow full item record
PublisherAMER GEOPHYSICAL UNION
CitationMardi, A. H., Dadashazar, H., MacDonald, A. B., Braun, R. A., Crosbie, E., Xian, P., et al. ( 2018). Biomass burning plumes in the vicinity of the California coast: Airborne characterization of physicochemical properties, heating rates, and spatiotemporal features. Journal of Geophysical Research: Atmospheres, 123, 13,560– 13,582. https://doi.org/10.1029/2018JD029134
Rights©2018. American Geophysical Union. All Rights Reserved.
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AbstractThis study characterizes in situ airborne properties associated with biomass burning (BB) plumes in the vicinity of the California coast. Out of 231 total aircraft soundings in July-August 2013 and 2016, 81 were impacted by BB layers. A number of vertical characteristics of BB layers are summarized in this work (altitude, location relative to cloud top height, thickness, number of vertically adjacent layers, interlayer distances) in addition to differences in vertical aerosol concentration profiles due to either surface type (e.g., land or ocean) or time of day. Significant BB layer stratification occurred, especially over ocean versus land, with the majority of layers in the free troposphere and within 100m of the boundary layer top. Heating rate profiles demonstrated the combined effect of cloud and BB layers and their mutual interactions, with enhanced heating in BB layers with clouds present underneath. Aerosol size distribution data are summarized below and above the boundary layer, with a notable finding being enhanced concentrations of supermicrometer particles in BB conditions. A plume aging case study revealed the dominance of organics in the free troposphere, with secondary production of inorganic and organic species and coagulation as a function of distance from fire source up to 450km. Rather than higher horizontal and vertical resolution, a new smoke injection height method was the source of improved agreement for the vertical distribution of BB aerosol in the Navy Aerosol Analysis and Prediction System model when compared to airborne data.
Note6 month embargo; published online: 31 October 2018
VersionFinal published version
SponsorsOffice of Naval Research [N00014-10-1-0811, N00014-11-1-0783, N00014-10-1-0200, N00014-04-1-0118, N00014-16-12567]; NASA [NNX14AP75G]