HR: 08:35h
AN: A31E-03 [Abstracts]
TI: Volatile Organic Compounds (VOCs) measured aboard the Ronald H. Brown during TexAQS 2006 and their OH reactivity.
AU: * Gilman, J B
EM: jessica.gilman@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, United
States
AU: * Gilman, J B
EM: jessica.gilman@noaa.gov
AF: CIRES, UCB 215, Boulder, CO 80304, United States
AU: Kuster, W C
EM: william.c.kuster@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, United
States
AU: Goldan, P D
EM: paul.d.goldan@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, United
States
AU: Goldan, P D
EM: paul.d.goldan@noaa.gov
AF: CIRES, UCB 215, Boulder, CO 80304, United States
AU: Warneke, C
EM: carsten.warneke@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, United
States
AU: Warneke, C
EM: carsten.warneke@noaa.gov
AF: CIRES, UCB 215, Boulder, CO 80304, United States
AU: deGouw, J A
EM: joost.degouw@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, United
States
AU: deGouw, J A
EM: joost.degouw@noaa.gov
AF: CIRES, UCB 215, Boulder, CO 80304, United States
AU: Lerner, B M
EM: brian.lerner@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, United
States
AU: Lerner, B M
EM: brian.lerner@noaa.gov
AF: CIRES, UCB 215, Boulder, CO 80304, United States
AU: Williams, E J
EM: eric.j.williams@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, United
States
AU: Williams, E J
EM: eric.j.williams@noaa.gov
AF: CIRES, UCB 215, Boulder, CO 80304, United States
AU: Brown, S S
EM: steven.s.brown@noaa.gov
AF: NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, United
States
AU: Brown, S S
EM: steven.s.brown@noaa.gov
AF: CIRES, UCB 215, Boulder, CO 80304, United States
AU: Hostoff, H
EM: hostoff@ucalgary.ca
AF: University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
AU: Herndon, S
EM: herndon@aerodyne.com
AF: Aerodyne, Inc., 45 Manning Road, Billerica, MA 01821, United States
AU: Zahniser, M
EM: mz@aerodyne.com
AF: Aerodyne, Inc., 45 Manning Road, Billerica, MA 01821, United States
AB:
Volatile Organic Compounds (VOCs) are a critical component in the photochemical production of ozone. Along
the coast of Texas there is an immense variety of industrial, urban, and biogenic sources of VOCs.
Formaldehyde measurements from a Quantum Cascade Laser-Tunable Infrared Laser Differential Absorption
Spectrometer (QCL-TILDAS) and VOC measurements from a Gas Chromatograph-Mass Spectrometer (GC-MS)
were used in an effort to characterize the VOC sources and identify the key reactive species that contribute the
most to potential ozone formation in the Houston/Galveston area. Ethane and propane had the highest median
mixing ratios at 4.7 and 3.0 ppbv, respectively, while n-butane had the highest maximum mixing ratio of 467.7
ppbv in a single sample. Ethene, propene, isoprene, formaldehyde, and acetaldehyde had the highest median
calculated OH reactivities ranging from 0.13 to 0.34 s-1, while vinyl acetate had the highest maximum contribution
to OH reactivity at 91.7 s-1 in a single sample. The data from the GC-MS shows that the total OH reactivity was
dominated by VOCs when compared to CO, CH4, and NO2 throughout the Galveston/Houston area and had
values ranging between 1-200 s-1. Diurnal profiles of the OH reactivity show the buildup of reactive VOCs in the
early morning hours just before sunrise and their subsequent photochemical processing.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting