HR: 1340h
AN: A33B-1181    [Abstracts]
TI: Quantifying the influence of particulate sulfate in a variety of marine environments: from coastal California to the tropical Atlantic
AU: Thiemens, M H
EM: mthiemens@ad.ucsd.edu
AF: University of California, San Diego, Dept. of Chemistry and Biochemistry 9500 Gilman Dr., La Jolla, CA 92093-0356, United States
AU: Jackson, T
EM: tjackson@ucsd.edu
AF: University of California, San Diego, Dept. of Chemistry and Biochemistry 9500 Gilman Dr., La Jolla, CA 92093-0356, United States
AU: Barnett, B
EM: barnettkid1@yahoo.com
AF: University of California, San Diego, Dept. of Chemistry and Biochemistry 9500 Gilman Dr., La Jolla, CA 92093-0356, United States
AU: Nguyen, B
EM: blnguyen@ucsd.edu
AF: University of California, San Diego, Dept. of Chemistry and Biochemistry 9500 Gilman Dr., La Jolla, CA 92093-0356, United States
AU: Corbin, A
EM: ahill@ucsd.edu
AF: University of California, San Diego, Dept. of Chemistry and Biochemistry 9500 Gilman Dr., La Jolla, CA 92093-0356, United States
AU: Prospero, J M
EM: jprospero@rsmas.miami.edu
AF: University of California, San Diego, Dept. of Chemistry and Biochemistry 9500 Gilman Dr., La Jolla, CA 92093-0356, United States
AU: Prospero, J M
EM: jprospero@rsmas.miami.edu
AF: RSMAS/MAC, University of Miami 4600 Rickenbacker Causeway, Miami, FL 33149, United States
AU: * Dominguez, G
EM: gdominguez@ucsd.edu
AF: University of California, San Diego, Dept. of Chemistry and Biochemistry 9500 Gilman Dr., La Jolla, CA 92093-0356, United States
AB: We present measurements of oxygen isotopes in aerosol nitrate and sulfate in a variety of marine environments. Our measurements of aerosol sulfate in Southern California, when measured as a function of size, reveal significant differences in the isotopic composition of aerosol sulfate found in sub-micron and super-micron sized aerosols. In general we found that sulfate in aerosols less than 1 micron have lower Δ¹⁷O values than that found in aerosols greater than 1 micron in size. Isotopic measurements of particulate sulfate from ship stacks reveals that these have a specific and unique isotopic composition in δ¹⁸O and Δ¹⁷O space. We present evidence for the influence of particulate sulfate sources in both Southern California and on the islands of Bermuda and Izana off the coast of Africa and examine probable sources of particulate sulfate in these locations.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0330 Geochemical cycles (1030)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting