HR: 09:18h
AN: A21G-06    [Abstracts]
TI: In-situ Ground-Based and Airborne Formaldehyde Measurements in the Houston Area During TexAQS-II
AU: * Rappenglueck, B
EM: brappenglueck@uh.edu
AF: University of Houston, 4800 Calhoun Rd, Houston, TX 77204, United States
AU: Byun, D
EM: Daewon.Byun@mail.uh.edu
AF: University of Houston, 4800 Calhoun Rd, Houston, TX 77204, United States
AU: Alvarez, S
EM: Sergio_Alvarez@baylor.edu
AF: Baylor University, One Bear Place #97413, Waco, TX 76798, United States
AU: Buhr, M
EM: marty@airqualitydesign.com
AF: Air Quality Design Inc, 801 Brickyard Circle, Golden, CO 80403, United States
AU: Coarfa, V
EM: Violeta.Coarfa@mail.uh.edu
AF: University of Houston, 4800 Calhoun Rd, Houston, TX 77204, United States
AU: Czader, B
EM: Beata.Czader@mail.uh.edu
AF: University of Houston, 4800 Calhoun Rd, Houston, TX 77204, United States
AU: Dasgupta, P
EM: dasgupta@uta.edu
AF: University of Texas at Arlington, 701 South Nedderman Drive, Arlington, TX 76019, United States
AU: Estes, M
EM: MESTES@tceq.state.tx.us
AF: Texas Commission on Environmental Quality, 12100 Park 35 Circle, Austin, TX 78753, United States
AU: Kim, S
EM: Soon.Kim@mail.uh.edu
AF: University of Houston, 4800 Calhoun Rd, Houston, TX 77204, United States
AU: Leuchner, M
EM: mleuchner@uh.edu
AF: University of Houston, 4800 Calhoun Rd, Houston, TX 77204, United States
AU: Luke, W
EM: Winston.Luke@noaa.gov
AF: NOAA-ARL, 1315 East-West Highway, Silver Spring, MD 20910, United States
AU: Shauck, M
EM: Maxwell_Shauck@baylor.edu
AF: Baylor University, One Bear Place #97413, Waco, TX 76798, United States
AU: Zanin, G
EM: Grazia_Zanin@baylor.edu
AF: Baylor University, One Bear Place #97413, Waco, TX 76798, United States
AB: Formaldehyde is considered to play a significant role in summertime photochemistry in the Houston area, in particular it is considered an important source for radicals. Secondary formation seems to be the most important fraction of ambient HCHO. Enhanced nighttime values may indicate primary sources. Potential sources may include mobile sources such as traffic exhaust, in particular not well maintained Diesel engines. Other possible sources may include point sources such as coffee roasting and flares from refineries. In this study we focused on the TexAQS-II continuous in-situ formaldehyde data set based on Hantzsch reaction which was obtained in the Ship Channel area (HRM3 and Lynchburg Ferry site) and at the Moody Tower for several weeks. We also include in-situ HCHO measurements obtained with the same technique aboard the Baylor aircraft during TexAQS-II flight missions. Formaldehyde data was compared to several trace gases that are supposed to be coemitted including CO (traffic), ethylene (flares), and SO2 (industry). In order to keep photochemical processes at a minimum special focus was on nighttime data. Case studies will be discussed where meteorological conditions including recirculation and boundary layer developments seem to play a major role in the redistribution of HCHO. Observations will be compared to CMAQ model studies.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting