A33L-0377
African Dust Concentrations in the Caribbean Island of Puerto Rico
Wednesday, 16 December 2015
Poster Hall (Moscone South)
Olga L Mayol-Bracero1, Flavia Morales-Garcia1,2, Gilmarie Santos-Figueroa1,3, Lillian Custals4, M Izaguirre4, Joseph M Prospero4 and William H McDowell2, (1)University of Puerto Rico Rio Piedras Campus, Department of Environmental Science, San Juan, PR, United States, (2)University of New Hampshire, Durham, NH, United States, (3)University of Puerto Rico Rio Piedras Campus, Department of Chemistry, San Juan, PR, United States, (4)University of Miami, RSMAS, Miami, FL, United States
Abstract:
African dust carried to the Tropical Atlantic and Caribbean was measured during the summer months of 2015. Atmospheric particles during dust events were collected at Cape San Juan, Puerto Rico on stacked-filter units and a high-volume sampler for the fine and coarse fractions and on a low-pressure impactor for size-resolved characterization. The filter ash gravimetric method was used to determine bulk dust mass concentrations for the first time in Puerto Rico. The method was validated analyzing same filter portions at CIAM/ACAR University of Puerto Rico and at RSMAS/MAC University of Miami. Filter's extracts were analyzed for ionic species measured by ion chromatography. The water-soluble organic carbon (WSOC) was determined with a total organic carbon (TOC) analyzer. Mineral dust concentrations in Puerto Rico were compared to those reported at Miami during summer periods. Comparison between dust concentration and regional PM10 data and results on size-resolved dust concentration will also be presented.
