HR: 09:45h
AN: A11E-08 [Abstracts]
TI: Effects of Ageing on Aerosol Composition and Size Distribution Based on Regional Scale Aircraft
Observations During the 2002 and 2004 ICARTT Campaigns
AU: * Kleinman, L
EM: kleinman@bnl.gov
AF: Brookhaven National Laboratory, Atmospheric Sci. Div., Upton, NY 11973
United States
AU: Daum, P
EM: phdaum@bnl.gov
AF: Brookhaven National Laboratory, Atmospheric Sci. Div., Upton, NY 11973
United States
AU: Springston, S
EM: srs@bnl.gov
AF: Brookhaven National Laboratory, Atmospheric Sci. Div., Upton, NY 11973
United States
AU: Lee, Y
EM: ynlee@bnl.gov
AF: Brookhaven National Laboratory, Atmospheric Sci. Div., Upton, NY 11973
United States
AU: Wang, J
EM: jian@bnl.gov
AF: Brookhaven National Laboratory, Atmospheric Sci. Div., Upton, NY 11973
United States
AB:
In the summers of 2002 and 2004 the DOE G-1 aircraft was used to sample aerosols and aerosol precursors in the Midwest and
Eastern U.S. We present data on the spatial distribution of aerosols and their physical and chemical properties. Most of
the sub-micron size aerosol consists of organics and sulfate. Only a minor fraction of the organic aerosol can be attributed
to primary emissions. Formation of secondary organic aerosol is observed as an increase in the organic to CO ratio as a
function of photochemical age. Organic aerosol is measured using an Aerodyne Aerosol Mass Spectrometer (AMS). We present
comparisons between the AMS and a PCASP, DMA, and nephelometer - as this bears upon our conclusions.
Production of aerosol sulfate can likewise be observed as a change in the sulfate to CO ratio but is more easily studied by
following the time evolution of a point source plume such as was done for the Homer and Keystone power plants, located east
of Pittsburgh. Concomitant with the addition of aerosol mass are changes in size spectra and optical properties.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005