HR: 0800h
AN: A51C-0072    [Abstracts]
TI: Nighttime Lagrangian aircraft measurements of trace gases and aerosols in urban plumes: A tale of two cities
AU: * Zaveri, R A
EM: Rahul.Zaveri@pnl.gov
AF: Pacific Northwest National Laboratory, MSIN K9-30, P.O. Box 999, Richland, WA 99352 United States
AU: Berkowitz, C M
EM: Carl.Berkowitz@pnl.gov
AF: Pacific Northwest National Laboratory, MSIN K9-30, P.O. Box 999, Richland, WA 99352 United States
AU: Hubbe, J M
EM: John.Hubbe@pnl.gov
AF: Pacific Northwest National Laboratory, MSIN K9-30, P.O. Box 999, Richland, WA 99352 United States
AU: Voss, P B
EM: pvoss@umass.geo.edu
AF: Smith College, Picker Engineering Program 51 College Lane, North Hampton, MA 01063 United States
AU: Hartley, T
EM: thartley@email.smith.edu
AF: Smith College, Picker Engineering Program 51 College Lane, North Hampton, MA 01063 United States
AU: Fortner, E
EM: edfortner@neo.tamu.edu
AF: Texas A&M University, 1204 Eller Bldg., 3150 TAMU, College Station, TX 77843 United States
AU: Zhang, R
EM: renyi-zhang@neo.tamu.edu
AF: Texas A&M University, 1204 Eller Bldg., 3150 TAMU, College Station, TX 77843 United States
AU: Valente, R J
EM: rjvalente@tva.gov
AF: Tennessee Valley Authority, Chemical Engineering Lab 745, Muscle Shoals, AL 35662 United States
AU: Pelt, V v
EM: vjvanpelt@tva.gov
AF: Tennessee Valley Authority, Chemical Engineering Lab 745, Muscle Shoals, AL 35662 United States
AU: Luria, M
EM: luria@vms.huji.ac.il
AF: The Hebrew University of Jerusalem, Environmental Sciences Division, Givat Ram, Jerusalem, 91904 Israel
AU: Springston, S R
EM: srs@bnl.gov
AF: Brookhaven National Laboratory, Building 815E, 75 Rutherford Drive, Upton, NY 11973 United States
AB: Overnight transport and chemical processing of urban plumes are expected to play important roles in controlling the concentrations of trace gases and aerosols several hundreds of kilometers downwind of the source area. However, these processes are still rather poorly understood due to limited nighttime measurements of the key species in urban plumes as they are advected downwind. We report here on the results from two Lagrangian aircraft campaigns to study the nighttime transport and chemistry of trace gases and aerosols downwind of Boston, MA, in July 2002, and Houston, TX, in July 2005. Both studies used Lagrangian balloons to `tag' parcels of air as they moved downwind from these urban areas. These tagged volumes of air were then repeatedly sampled with instrumented aircraft from dusk to dawn to characterize the meteorological and chemical processes. Analysis of the Boston dataset suggests an unexplained loss of ozone in the presence of aerosols at a rate of about 2% per hour. Preliminary analysis of the Houston dataset provides clear evidence of nighttime transport of Houston pollution over about 300 km. Implications of overnight dispersion and chemical processing of the reactive species on the following day's chemistry in the downwind region will be discussed.
DE: 0305 Aerosols and particles (0345, 4801, 4906)
DE: 0317 Chemical kinetic and photochemical properties
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0368 Troposphere: constituent transport and chemistry
DE: 3360 Remote sensing
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005