HR: 1340h
AN: A43A-0878 [Abstracts]
TI: OH Background Measurements and Their Significance
AU: * Mauldin, L
EM: mauldin@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa, Boulder, CO 80303, United
States
AU: * Mauldin, L
EM: mauldin@ucar.edu
AF: Dept. of Atmospheric and Oceanic Sciences - University of Colorado, UCB 311, Boulder,
CO 80308-311, United States
AU: Kosciuch, E
EM: kosciuch@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa, Boulder, CO 80303, United
States
AU: Josh, M
EM: mcgrath@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa, Boulder, CO 80303, United
States
AU: Josh, M
EM: mcgrath@ucar.edu
AF: Dept. of Atmospheric and Oceanic Sciences - University of Colorado, UCB 311, Boulder,
CO 80308-311, United States
AB:
The hydroxyl radical, OH is known to be the primary gas phase oxidant in most tropospheric environments,
however other species can contribute to the total overall oxidizing capacity. Our CIMS technique for the
measurement of OH involves both a signal and a background measurement. The signal measurement is a
measure of all species that react with SO2 to produce H2SO4 (which presumably is mainly OH),
while the background accounts for all species that can convert SO2 into H2SO4, yet do not react
with propane. This background measurement while necessary for the determination of OH, is also a measure of
other strong oxidants and can be quite large even in the absence of OH (as determined via the CIMS technique).
Here we will focus on OH background data obtained in marine, urban, and remote continental conditions.
Correlation of these measurements with other species such as NO and SO2 will be presented.
Atmospheric implications will also be discussed.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0325 Evolution of the atmosphere (1610, 8125)
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0394 Instruments and techniques
SC: Atmospheric Sciences [A]
MN: 2007 Fall Meeting