HR: 0800h
AN: A31C-0077    [Abstracts]
TI: Heterogeneous Chlorine Chemistry with Mineral Dust Particles in the Marine Boundary Layer: Observation, Modeling, and Potential Impacts
AU: * Guazzotti, S A
EM: serad@chem.ucsd.edu
AF: University of California, San Diego, Department of Chemistry and Biochemistry, University of California, San Diego Mail Code 0314 , La Jolla, CA 92093 United States
AU: Sodeman, D A
EM: dsodeman@chem.ucsd.edu
AF: University of California, San Diego, Department of Chemistry and Biochemistry, University of California, San Diego Mail Code 0314 , La Jolla, CA 92093 United States
AU: Tang, Y
EM: ytang@cgrer.uiowa.edu
AF: University of Iowa, Center for Global and Regional Environmental Research, 4140 Seamans Center for the Engineering Arts and Sciences, University of Iowa, Iowa City, IA 52242 United States
AU: Carmichael, G R
EM: gcarmich@engineering.uiowa.edu
AF: University of Iowa, Center for Global and Regional Environmental Research, 4140 Seamans Center for the Engineering Arts and Sciences, University of Iowa, Iowa City, IA 52242 United States
AU: Prather, K A
EM: kprather@chem.ucsd.edu
AF: University of California, San Diego, Department of Chemistry and Biochemistry, University of California, San Diego Mail Code 0314 , La Jolla, CA 92093 United States
AB: Mineral dust particles were analyzed during a major dust storm episode in the course of the Asian Pacific Regional Aerosol Chemical Characterization Experiment (ACE-Asia) using a transportable aerosol time-of-flight mass spectrometer for single particle characterization. From the chemical information for single particles, including spectral signatures and elemental ratios, the association of dust particles with chlorine was inferred. Furthermore, the analysis allowed for differentiation between the presence of chlorine in dust particles due to uptake of chlorine-containing species or coagulation between sea salt and dust particles. Significant influences on the physical and chemical properties of dust particles, radiative effects, and biogeochemical cycles can be brought about by this chlorine chemistry which needs to be considered to improve model calculations and to properly evaluate the results from field campaigns.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0317 Chemical kinetic and photochemical properties
DE: 0368 Troposphere--constituent transport and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting