HR: 13:55h
AN: A33C-02    [Abstracts]
TI: Evidence of Soluble Sulfate Coatings on Aged Mineral Dust Particles in the East Asian Region
AU: * Perry, K D
EM: perry@met.utah.edu
AF: University of Utah, 135 S 1460 E, Rm 819, Salt Lake City, UT 84112-0110 United States
AU: Cliff, S S
EM: sscliff@ucdavis.edu
AF: University of California, Davis, One Shields Ave, Davis, CA 95616 United States
AU: Jimenez-Cruz, M P
EM: mpjimenezcruz@ucdavis.edu
AF: University of California, Davis, One Shields Ave, Davis, CA 95616 United States
AU: Wu, Y
EM: yhwu@atmos.washington.edu
AF: University of Washington, 408 ATG Building Box 351640, Seattle, WA 98195
AU: Xie, C
EM: cbxie@naol.hfcas.ac.cn
AF: Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, PO Box 1125, Hefei, 230031 China
AU: Zhou, J
EM: j-zhou@aiofm.ac.cn
AF: Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Science, PO Box 1125, Hefei, 230031 China
AB: Recently published results from the Intercontinental Transport and Chemical Transformation 2K2 experiment (Perry et al., 2004) demonstrated that the mass distribution of Asian mineral dust particles arriving at the west coast of the United States responds to changes in relative humidity. The most likely explanation for the hygroscopic behavior of the aged mineral dust is the formation of soluble coatings either within the East Asian region or during transit across the Pacific Ocean. This study will use ground-based measurements of the size-resolved aerosol elemental composition collected during the ACE-Asia experiment to determine the prevalence of soluble sulfate coatings on mineral dust within the East Asian region and along the west coast of the U.S. Measurements from Hefei, China clearly show that there are periods of coated and non-coated mineral dust. Meteorological analyses of these episodes revealed that the coarse sulfate mass was highly correlated with the transit time from the mineral dust source regions to the receptor site. Little or no coarse sulfate was observed when the transit time was less than 3 days. Simultaneous measurements from Cheju, Korea show that the prevalence and mass of the soluble sulfate coatings on the mineral dust increases as the air mass is advected downwind from China. By the time the air mass arrives at the U.S., all of the mineral dust particles have a sulfate coating. This study demonstrates that the formation of soluble sulfate coatings on the mineral dust begins within the East Asian region and continues to evolve throughout the long-range transport process.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0322 Constituent sources and sinks
DE: 0325 Evolution of the atmosphere
DE: 0345 Pollution--urban and regional (0305)
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting