Characterization of water-soluble brown carbon chromophores from wildfire plumes in the western USA using size-exclusion chromatography
Lisa Azzarello,Rebecca A. Washenfelder,Michael A. Robinson,Alessandro Franchin,Caroline C. Womack,Christopher D. Holmes,Steven S. Brown,Ann Middlebrook,Tim Newberger,Colm Sweeney,and Cora J. Young
Lisa Azzarello
Department of Chemistry, York University, Toronto, ON M3J 1P3, Canada
Rebecca A. Washenfelder
Chemical Sciences Laboratory, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, CO 80305, USA
We present a molecular size-resolved offline analysis of water-soluble brown carbon collected on an aircraft during FIREX-AQ. The smoke plumes were aged 0 to 5 h, where absorption was dominated by small molecular weight molecules, brown carbon absorption downwind did not consistently decrease, and the measurements differed from online absorption measurements of the same samples. We show how differences between online and offline absorption could be related to different measurement conditions.
We present a molecular size-resolved offline analysis of water-soluble brown carbon collected on...