HR: 17:00h
AN: A44B-05    [Abstracts]
TI: Preliminary Results of Aerosol Chemical Composition Measurements Above the Northeastern U. S. with an Aerodyne Aerosol Mass Spectrometer
AU: * Middlebrook, A M
EM: Ann.M.Middlebrook@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, R/AL7, Boulder, CO 80305-3328 United States
AU: Matthew, B M
EM: Brendan.Matthew@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, R/AL7, Boulder, CO 80305-3328 United States
AU: Matthew, B M
EM: Brendan.Matthew@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Campus Box 216, Boulder, CO 80309-0216 United States
AU: Brock, C A
EM: Charles.A.Brock@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, R/AL7, Boulder, CO 80305-3328 United States
AU: Brock, C A
EM: Charles.A.Brock@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Campus Box 216, Boulder, CO 80309-0216 United States
AU: Wollny, A G
EM: Adam.Wollny@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, R/AL7, Boulder, CO 80305-3328 United States
AU: Wollny, A G
EM: Adam.Wollny@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Campus Box 216, Boulder, CO 80309-0216 United States
AU: DeGouw, J A
EM: jdegouw@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, R/AL7, Boulder, CO 80305-3328 United States
AU: DeGouw, J A
EM: jdegouw@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Campus Box 216, Boulder, CO 80309-0216 United States
AU: Warneke, C
EM: Carsten.Warneke@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, R/AL7, Boulder, CO 80305-3328 United States
AU: Warneke, C
EM: Carsten.Warneke@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Campus Box 216, Boulder, CO 80309-0216 United States
AU: Fehsenfeld, F C
EM: Fred.C.Fehsenfeld@noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, R/AL7, Boulder, CO 80305-3328 United States
AU: Fehsenfeld, F C
EM: Fred.C.Fehsenfeld@noaa.gov
AF: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Campus Box 216, Boulder, CO 80309-0216 United States
AU: Peltier, R
EM: rpeltier@eas.gatech.edu
AF: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340 United States
AU: Weber, R
EM: rweber@eas.gatech.edu
AF: School of Earth and Atmospheric Sciences, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332-0340 United States
AB: The Aerodyne Aerosol Mass Spectrometer (AMS), which measures non-refractory components of aerosol particles with aerodynamic diameters between roughly 40 nm and 1.5 microns, provides mass spectra as well as organic, sulfate, ammonium, and nitrate mass distributions. Preliminary results will be shown from the Intercontinental Transport and Chemical Transformation - New England Air Quality Study (ITCT-NEAQS 2004) during July-August 2004, where an AMS was deployed aboard the NOAA WP-3D aircraft above the northeastern United States and 30-second averaged samples were collected. For the first time, a pressure controlled inlet was used to maintain a constant mass flow rate into the AMS for airborne sampling. By comparing the AMS total mass loadings to aerosol volume from optical measurements, the AMS aerodynamic focusing lens appeared to have significantly lower particle transmission efficiencies for particles with vacuum aerodynamic diameters larger than 700 nm (or around 500 nm optical diameter). A wide variety of air masses were sampled during the intensive period, including clean continental, fresh and aged urban, biomass burning, and power plant plumes. In general, the total AMS mass loadings were less than 10 micrograms per cubic meter and the composition was mostly organic and sulfate with lesser amounts of ammonium and nitrate. Furthermore, most of the organic material was oxidized, which is consistent with the organic material being aged and secondary in nature. In some power plant plumes, fresh particle formation was observed in both the sulfate mass and particle volume distributions. Variations in the relative amounts of sulfate and organic material were also measured in many sulfate plumes and the possibility of acid-catalyzed organic reactions of gas phase organic compounds with acidic sulfate particles will be explored.
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: 0368 Troposphere--constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2004 AGU Fall Meeting