HR: 0830h
AN: A51F-0752    [PDF]
TI: Detection of the mixing state of individual organic carbon and elemental carbon particles from 50 nm up to 3 micrometers
AU: * Spencer, M
EM: mtspence@chem.ucsd.edu
AF: University of California, San Diego, 9500 Gilman Dr., Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Sipin, M
EM: msipin@chem.ucsd.edu
AF: University of California, San Diego, 9500 Gilman Dr., Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Su, Y
EM: yxsu@chem.ucsd.edu
AF: University of California, San Diego, 9500 Gilman Dr., Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Guazzotti, S
EM: serad@chem.ucsd.edu
AF: University of California, San Diego, 9500 Gilman Dr., Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Qin, S
EM: xqin@chem.ucsd.edu
AF: University of California, San Diego, 9500 Gilman Dr., Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AU: Prather, K A
EM: kprather@ucsd.edu
AF: University of California, San Diego, 9500 Gilman Dr., Dept. of Chemistry and Biochemistry, Scripps Institution of Oceanography, La Jolla, CA 92093-0314 United States
AB: Current semi-continuous methods for organic carbon and elemental carbon rely on an operational definition when distinguishing between the relative fractions of these species in ambient samples. Aerosol time-of-flight mass spectrometry (ATOFMS) measures the aerodynamic size and chemical composition of individual particles, providing information on elemental carbon and organic carbon in atmospheric particles using unique mass spectral signatures. In ambient and source characterization datasets, organic carbon, elemental carbon, and combinations of these species are detected in multiple locations including the Sea of Japan, California, New York, and Georgia. The temporal variability of these species with 30-60 minute resolution has been examined. Furthermore, ATOFMS can be used to monitor partitioning of polycyclic aromatic hydrocarbons over time as a function of temperature and relative humidity. This presentation will discuss how these single particle mass spectral signatures can be used to understand the transformations as well as origins of carbonaceous particles in the atmosphere. A comparison will be made between carbonaceous particles detected in ultrafine (less than 100 nm) versus fine (100 nm to 3 microns) particles.
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