HR: 09:30h
AN: A51A-07    [PDF]
TI: Aircraft Observations of the Tampa Urban Plume during BRACE: Transport, Photochemical, and Depositional Processes
AU: * Luke, W
EM: Winston.Luke@noaa.gov
AF: NOAA/Air Resources Laboratory, SSMC3, Rm. 3316 1315 East West Hwy., Silver Spring, MD 20910 United States
AU: Arnold, J
EM: Arnold.Jeff@epamail.epa.gov
AF: NOAA/Air Resources Laboratory, SSMC3, Rm. 3316 1315 East West Hwy., Silver Spring, MD 20910 United States
AU: Watson, T
EM: Tom.Watson@noaa.gov
AF: NOAA/Air Resources Laboratory, SSMC3, Rm. 3316 1315 East West Hwy., Silver Spring, MD 20910 United States
AU: Gunter, L
EM: gunter@atdd.noaa.gov
AF: NOAA/Air Resources Laboratory, SSMC3, Rm. 3316 1315 East West Hwy., Silver Spring, MD 20910 United States
AU: Wellman, D
EM: Dennis.L.Wellman@noaa.gov
AF: NOAA/Air Resources Laboratory, SSMC3, Rm. 3316 1315 East West Hwy., Silver Spring, MD 20910 United States
AU: Dasgupta, P
EM: sandy.dasgupta@ttu.edu
AF: Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409 United States
AU: Li, J
EM: Jianzhong.Li@ttu.edu
AF: Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, TX 79409 United States
AU: Riemer, D
EM: d.riemer@miami.edu
AF: University of Miami/RSMAS, 4600 Rickenbacker Causeway, Miami, FL 33149 United States
AB: Staff from NOAA's Air Resources Laboratory conducted airborne measurements of trace gases and aerosols in the Bay Region Atmospheric Chemistry Experiment (BRACE) using the NOAA Twin Otter. The Twin Otter flew more than 90 hours in 21 flights in and around the Tampa metropolitan region in May, 2002, at altitudes of 60-3000 m MSL. Flights were conducted over rural and suburban areas, over the centers of Tampa and St. Petersburg, and over Tampa Bay and the Gulf of Mexico. The overall objective of the aircraft measurements in BRACE was to study the emission, transport, and photochemical transformations of nitrogen and other ozone precursors in the Tampa area. Continuous instrumentation was used to measure NO, NOX, NOY, HNO3, CO, SO2, O3, CH2O, and H2O2. A semi-continuous GC technique with luminol detection was used to measure PAN. Filter packs were used to make integrated measurements of nitric acid and inorganic aerosols in both fine and bulk aerosol size fractions. Stainless steel grab cans were filled during flight for post-flight analysis of NMHCs by GC/FID/MS. The urban plume was sampled under a variety of meteorological regimes, as it was advected by the prevailing winds over the Florida peninsula (with continuing input of natural and anthropogenic precursors along the advection path) and, in other cases, over the Gulf of Mexico, where additional chemical inputs were negligible and the plume was relatively unaffected by turbulent deposition processes. Case studies will be used to compare and contrast the photochemical processes in the plume under these different regimes. The observed relationships and variations of trace gas concentrations will be used to determine the efficiency of ozone production, as well as instances of NOX or VOC limitation. Sampling the plume at varying downwind distances, over both land and water, allows the determination of overall rates of photochemical ozone production, NOX and SOX oxidation, and estimates of depositional losses of trace species.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0312 Air/sea constituent fluxes (3339, 4504)
DE: 0315 Biosphere/atmosphere interactions
DE: 0345 Pollution--urban and regional (0305)
DE: 0365 Troposphere--composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting