AAAR 35th Annual Conference October 17 - October 21, 2016 Oregon Convention Center Portland, Oregon, USA
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Metal Composition and Source Identification of Particulate Matter around a Shrinking, Saline Lake (Salton Sea) via Pb Isotope and Metal Ratio Analysis
ALEXANDER FRIE, Justin Dingle, Samantha Ying, Roya Bahreini, University of California Riverside
Abstract Number: 67 Working Group: Remote and Regional Atmospheric Aerosols
Abstract The composition and source of ambient particulate matter(PM) were investigated at the Salton Sea, California. Understanding PM composition around the Salton Sea is particularly important as water inputs into the sea decrease and playa is exposed, potentially greatly increasing playa-sourced dust emissions in the Salton Sea Basin. Size-resolved day and night PM samples were collected via a Micro Orifice Uniform Deposit Impactor(MOUDI) in August of 2015 and February of 2016 at Salton City, CA, and in August 2015 at Bombay Beach, CA. Soil samples from exposed playa and non-playa soils were collected in August 2015. PM and soil samples were acid-digested and analyzed for total Ca, Na, As, Al, Cr, Cu, Fe, Mn, Ni, Zn, V, Ba, Cd, Co, Se, Sn, Ti, K, Th and for Pb207, Pb206, and Pb208 isotopes via Q-ICP-MS. Pb isotopic ratios, metal concentrations relative to Fe, and metal covariability will be used to examine the relative importance of exposed playa and arid soils as dust sources in the region. Variation in these parameters will be investigated in relation to ambient relative humidity, average wind speed and direction, and winter/summer seasonality.