HR: 16:50h
AN: A24C-04 [Abstracts]
TI: Chemical Transformation and Optical Properties of Aerosols From Urban Areas During the TexAQS/GoMACCS Study
AU: * Middlebrook, A M
EM: Ann.M.Middlebrook@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Bahreini, R
EM: Roya.Bahreini@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Bahreini, R
EM: Roya.Bahreini@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Dunlea, E J
EM: Edward.Dunlea@colorado.edu
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: DeCarlo, P D
EM: Peter.DeCarlo@colorado.edu
AF: University of Colorado Dept of Chemistry, PO Box 0215, Boulder, CO 80309, United States
AU: Jimenez, J L
EM: Jose.Jimenez@colorado.edu
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Jimenez, J L
EM: Jose.Jimenez@colorado.edu
AF: University of Colorado Dept of Chemistry, PO Box 0215, Boulder, CO 80309, United States
AU: Baynard, T
EM: Tahllee.Baynard@comcast.net
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Baynard, T
EM: Tahllee.Baynard@comcast.net
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Spackman, J R
EM: Ryan.Spackman@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Spackman, J R
EM: Ryan.Spackman@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Schwarz, J P
EM: Joshua.P.Schwarz@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Schwarz, J P
EM: Joshua.P.Schwarz@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Watts, L A
EM: Laurel.A.Watts@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Watts, L A
EM: Laurel.A.Watts@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Thomson, D S
EM: David.S.Thomson@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Thomson, D S
EM: David.S.Thomson@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Wollny, A G
EM: Adam.Wollny@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Wollny, A G
EM: Adam.Wollny@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Gallar, C
EM: Carlos.Gallar@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Gallar, C
EM: Carlos.Gallar@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Brock, C A
EM: Charles.A.Brock@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Holloway, J S
EM: John.S.Holloway@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Holloway, J S
EM: John.S.Holloway@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: de Gouw, J A
EM: Joost.deGouw@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: de Gouw, J A
EM: Joost.deGouw@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Warneke, C
EM: Carsten.Warneke@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Warneke, C
EM: Carsten.Warneke@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Ryerson, T B
EM: Thomas.B.Ryerson@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Trainer, M
EM: Michael.Trainer@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Fehsenfeld, F C
EM: Fred.C.Fehsenfeld@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AU: Fehsenfeld, F C
EM: Fred.C.Fehsenfeld@noaa.gov
AF: University of Colorado CIRES, PO Box 0216, Boulder, CO 80309, United States
AU: Meagher, J F
EM: James.F.Meagher@noaa.gov
AF: NOAA ESRL, 325 Broadway, Boulder, CO 80305, United States
AB:
Size-resolved, non-refractory (NR) aerosol composition was measured on a 10-second basis and with high
sensitivity aboard the NOAA WP-3D aircraft using an Aerodyne Compact Time-of-Flight Aerosol Mass
Spectrometer (C-ToF AMS) during the 2006 Texas Air Quality Study/Gulf of Mexico Atmospheric Composition and
Climate Study (TexAQS/GoMACCs). Fine features in the C-ToF AMS data were highly correlated with independent
measurements of submicron aerosol volume and dry extinction. There are emissions of several secondary
aerosol precursors in the Houston area: sulfur dioxide (SO2) from industrial facilities and isolated power plants
as well as volatile organic compounds (VOCs) from industrial facilities mainly along the ship channel and from
other urban sources. Downwind of Houston, there is a clear progression of increasing aerosol mass as a
function of distance, with both sulfate and organic material being formed. However, the complexity of the Houston
area sources produces an inhomogeneous composition of the aerosol downwind, also depending on the
upwind source. Since the sources of SOA (secondary organic aerosol) precursors cover a large area whereas
SO2 is emitted from point sources, the urban area generally produces broadly distributed SOA with narrow, high
mass concentrations of sulfate aerosol in the first several hours downwind. In contrast, Dallas is more typical of
urban areas with VOCs from mobile emissions as the main precursor of secondary aerosol. Hence, downwind
of Dallas the aerosol is more homogeneous in composition and primarily organic. The hygroscopic and optical
properties of the aerosol, as it is transformed downwind of both urban areas, will also be discussed.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0360 Radiation: transmission and scattering
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting