HR: 0830h
AN: A11E-0024    [PDF]
TI: Dust, Aerosol Ions and Their Interactions with Gaseous Species in East Asia During Spring 2001: A three-dimensional model Study
AU: * Tang, Y
EM: ytang@cgrer.uiowa.edu
AF: Center for Global and Regional Environmental Research, University of Iowa 402 IATL, Iowa City, IA 52242 United States
AU: Carmichael, G R
EM: gcarmich@engineering.uiowa.edu
AF: Center for Global and Regional Environmental Research, University of Iowa 402 IATL, Iowa City, IA 52242 United States
AU: Seinfeld, J H
EM: seinfeld@caltech.edu
AF: Department of Chemical Engineering, California Institute of Technology, California Institute of Technology, Pasadena, CA 91125 United States
AU: Dabdub, D
EM: ddabdub@uci.edu
AF: Department of Mechanical and Aerospace Engineering, University of California at Irvine, Irvine, CA 92697 United States
AU: Weber, R J
EM: tweber@eas.gatech.edu
AF: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332 United States
AU: Huebert, B
EM: huebert@hawaii.edu
AF: School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822 United States
AU: Clarke, A D
EM: tclarke@soest.hawaii.edu
AF: School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822 United States
AU: Guazzotti, S A
EM: serad@chem.ucsd.edu
AF: Department of Chemistry and Biochemistry, University of California at San Diego, San Diego, CA 92093 United States
AU: Prather, K A
EM: kprather@ucsd.edu
AF: Department of Chemistry and Biochemistry, University of California at San Diego, San Diego, CA 92093 United States
AU: Sodeman, D A
EM: dsodeman@chem.ucsd.edu
AF: Department of Chemistry and Biochemistry, University of California at San Diego, San Diego, CA 92093 United States
AU: Uno, I
EM: iuno@riam.kyushu-u.ac.jp
AF: Research Institute for Applied Mechanics, Kyushu University, Fukuoka, 816-8580 Japan
AU: Woo, J
EM: woojh21@cgrer.uiowa.edu
AF: Center for Global and Regional Environmental Research, University of Iowa 402 IATL, Iowa City, IA 52242 United States
AU: Streets, D G
EM: dstreets@anl.gov
AF: Decision and Information Sciences Division, Argonne National Laboratory, Argonne, IL 60439 United States
AU: Quinn, P
EM: quinn@pmel.noaa.gov
AF: NOAA Pacific Marine Environmental Laboratory, 7600 Sand Point Way NE, Seattle, WA 98115 United States
AU: Johnson, J E
EM: johnson@pmel.noaa.gov
AF: NOAA Pacific Marine Environmental Laboratory, 7600 Sand Point Way NE, Seattle, WA 98115 United States
AU: Song, C
EM: cs222@mail.gatech.edu
AF: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332 United States
AU: Anderson, T L
EM: tadand@atmos.washington.edu
AF: Department of Atmospheric Science, University of Washington, Seattle, WA 98195 United States
AU: Sandu, A
EM: asandu@mtu.edu
AF: Department of Computer Science, Michigan Technological University, Houghton, MI 49931 United States
AU: Talbot, R W
EM: robert.talbot@unh.edu
AF: Department of Earth Sciences, University of New Hampshire, Durham, NH 03824 United States
AU: Dibb, J E
EM: jack.dibb@unh.edu
AF: Department of Earth Sciences, University of New Hampshire, Durham, NH 03824 United States
AB: A comprehensive regional chemical transport model is developed to study the aerosol-related issues for TRACE-P and ACE-ASIA experiments, which includes on-line thermodynamic module SCAPE II and on-line photolysis-rate calculation TUV, and explicitly considers dust heterogeneous reactions and chemical-aging process. The Asian outflow during March and April of 2001 is heavy polluted with high aerosol loading. Under cation-limited condition, SO$_{2}$ oxidation and ammonium availability determined the nitrate size and gas-aerosol distributions. Dust was one of most important aerosol outflow during this period, which brought significant influences on other aerosols and gaseous species. A main role of dust in the equilibrium process is through the enhancement of the aerosol calcium concentration, which shifts the equilibrium balance to an anion-limited status. This status benefits the uptake of sulfate and nitrate, but repels ammonium. Dust influence on secondary aerosols and their size distributions is also determined by dust mass, size distribution and fresh ratio. The impacts of heterogeneous reactions on fresh dust involving O$_{3}$, NO$_{2}$, SO$_{2}$ and HNO$_{3}$ are studied by incorporating these reactions into the analysis. These reactions have significant influence on regional chemistry. For examples, the low O$_{3}$ concentrations in the C-130 flight 6 can be explained only by the influence of heterogeneous reactions. Dust appearance significantly increased optical depth, and the radiative influence of dust can also affect the photochemical system. For example, OH levels can decrease by 20% near surface. All these dust impacts is sensitive to the dust mass, its size distribution, assumptions about its mixing state (internal vs. external), and the fraction of the aerosol mass available for heterogeneous reactions and equilibrium process.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0317 Chemical kinetic and photochemical properties
DE: 0365 Troposphere--composition and chemistry
DE: 0368 Troposphere--constituent transport and chemistry
DE: 3337 Numerical modeling and data assimilation
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting