HR: 11:20h
AN: A21G-04    [PDF]
TI: Integrating High Temporal Resolution Single Particle Data with Atmospheric Models
AU: * Prather, K A
EM: kprather@ucsd.edu
AF: University of California San Diego, Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Guazzotti, S
EM: serad@ucsd.edu
AF: University of California San Diego, Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Sodeman, D
EM: dsodeman@chem.ucsd.edu
AF: University of California San Diego, Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Holecek, J
EM: jholecek@ucsd.edu
AF: University of California San Diego, Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Carmichael, G R
EM: gcarmich@engineering.uiowa.edu
AF: University of California San Diego, Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Carmichael, G R
EM: gcarmich@engineering.uiowa.edu
AF: University of Iowa, Center for Global and Regional Environmental Research, Iowa City, IA 52242 United States
AU: Tang, Y
EM: ytang@cgrer.uiowa.edu
AF: University of Iowa, Center for Global and Regional Environmental Research, Iowa City, IA 52242 United States
AB: Single particle analysis can provide direct insight into the evolution of the mixing state of atmospheric particles. Information at this level can be used to gain insights into particle sources as well as atmospheric processing. There are a number of instruments which have been developed in the past decade which allow one to measure the size and chemical composition of individual particles in real time. This presentation will focus on aerosol time-of-flight mass spectrometry (ATOFMS) measurements made during ACE-Asia and other locations in the United States, focusing on the size-resolved chemical information that can be acquired with single particle mass spectrometers. The ability to use single particle signatures to distinguish between elemental carbon (EC), organic carbon (OC), and various mixtures will be demonstrated. Results will be presented showing how unique mass spectral markers can be used to discriminate between dust, sea salt, fossil fuel, and biomass particles, monitoring their relative contributions and changes in chemistry on short timescales. A discussion of how single particle measurements might be used to refine current atmospheric models by adding unique information will be presented.
DE: 0305 Aerosols and particles (0345, 4801)
DE: 0322 Constituent sources and sinks
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting