HR: 08:45h
AN: A11E-04    [Abstracts]
TI: Characterization of Submicron Aerosol Organic Fraction by FTIR Spectrometry at Four ICARTT Platforms
AU: * Gilardoni, S
EM: sgilardoni@ucsd.edu
AF: Scripps Institution of Oceanography, University of California San Diego, 9500 Gillman Drive mail code 0221, La Jolla, CA 92093 United States
AU: Russell, L M
EM: lmrussell@ucsd.edu
AF: Scripps Institution of Oceanography, University of California San Diego, 9500 Gillman Drive mail code 0221, La Jolla, CA 92093 United States
AU: Bates, T S
EM: tim.bates@noaa.gov
AF: NOAA Pacific Marine Environmental Laboratory, 7600 Sand Point Way N.E., Seattle, WA 98115 United States
AU: Quinn, P K
EM: patricia.k.quinn@noaa.gov
AF: NOAA Pacific Marine Environmental Laboratory, 7600 Sand Point Way N.E., Seattle, WA 98115 United States
AU: Seinfeld, J H
EM: seinfeld@caltech@edu
AF: Chemistry and Chemical Engineering Department, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 United States
AU: Flagan, R C
EM: flagan@caltech.edu
AF: Chemistry and Chemical Engineering Department, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 United States
AU: Sorooshian, A
EM: armin@caltech.edu
AF: Chemistry and Chemical Engineering Department, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125 United States
AU: Sive, B C
EM: bcs@ccrc.sr.unh.edu
AF: Institute for the Study of Earth, Oceans and Space, University of New Hampshire, 39 College Road, Durham, NH 03824 United States
AU: Varner, R K
EM: ruth.varner@unh.edu
AF: Institute for the Study of Earth, Oceans and Space, University of New Hampshire, 39 College Road, Durham, NH 03824 United States
AB: FTIR spectrometry has been employed to investigate organic fraction composition of atmospheric aerosol samples collected during the ICARTT project in summer 2004. Four different platforms have been studied. Sampling has been performed by a Twin Otter plane, flying over power plant areas in Ohio, and on board of a ship (the research vessel Ronald H. Brown) along the coast of New England. In addition two ground sampling sites have been investigated: Chebogue Point (Nova Scotia, Canada) and Appledore Island (New Hampshire). Alkanes, alkenes, aromatic compounds, ammonia, nitrates, sulfates, organo-sulfur compounds, carbonyl and hydroxyl functional groups have been detected in all the sampling sites. Ammine absorption signal has been observed only in samples collected at Chebogue Point and Appledore Island. Organo-sulfur compounds signal has been observed only in a few samples and correlation of sulfur species presence and meteorological conditions has been studied. The ratio of unsaturated hydrocarbon (alkenes and aromatic compounds) relative to saturated hydrocarbon (alkanes) absorption has been investigated. At Chebogue Point, wind backtrajectory data have been used to distinguish samples affected by air masses coming from different polluted regions in Ohio and urban New England. Similar unsaturated/saturated hydrocarbon ratios have been found in Nova Scotia and in the source regions. Oxygenated functional group (carboxyl and hydroxyl) absorption is indicative of oxidation processes and aerosol aging. Carbonyl and hydroxyl groups show stronger signals in samples collected downwind of anthropogenic aerosol sources (Appledore Island and Nova Scotia). Twin Otter samples show a weaker contribution from carboxylic group absorption relative to the other three sampling platforms. Differences observed among sampling sites, other than being related to different local sources, illustrate the role of mixing and aging of atmospheric aerosol, associated with transport of air masses.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005