10th International Aerosol Conference September 2 - September 7, 2018 America's Center Convention Complex St. Louis, Missouri, USA
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Observed Below-cloud Aerosol Chemical and Physical Properties on Whiteface Mountain, New York during August 2017
JIE ZHANG, Sara Lance, Richard Brandt, Joseph P. Marto, Matthew Ninneman, James Schwab, University at Albany, SUNY
Abstract Number: 62 Working Group: Aerosol Chemistry
Abstract A pilot study took place at Whiteface Mountain (WFM) in the Adirondacks of upstate NY during the summer of 2017 to study the chemical processing of organics within clouds. The below-cloud submicron aerosols were characterized in real-time from onboard the ASRC Sprinter van using an Aerodyne High Resolution Time-of-Flight Aerosol Mass Spectrometer (HR-TOF-AMS), a TSI Scanning Mobility Particle Sizer Spectrometer (SMPS), a DMT Cloud Condensation Nuclei counter (CCNc), and a TSI Condensation Particle Counter (CPC). The HR-TOF-AMS measurements are used to analyze chemical composition of below-cloud aerosols focusing on different organic factors, which are then compared with offline HR-TOF-AMS measurements of bulk cloud water samples collected at the summit during the same time period. Aerosol size distribution and CCN activation efficiency measurements at the summit are compared to the below-cloud measurements as well (using the same instruments). Differences in the measurements under clear and cloudy conditions are explored to probe the potential influence of aqueous chemical reactions on secondary organic aerosol formation.