Sponsor
This work was supported by National Science Foundation grant ATM-8615163, National Aeronautics and Space Administration grant NAG-I-697, and Environmental Protection Agency grant R81-3012.
Published In
Journal of Geophysical Research
Document Type
Article
Publication Date
6-1-1992
Subjects
Air -- Pollution -- Measurement, Air -- Pollution -- Oregon, Hydroxyl group
Abstract
Ambient HO measurements by low-pressure laser-excited fluorescence with chemical modulation, and supporting ozone and water-vapor data, are presented for periods in May and August 1987. The observed peak daytime ambient HO concentrations in Oregon are in the range (2.5 to 8) times106 molecules cm⁻³ and show small negative offsets due to photochemical interference. Direct measurements of the interference at fixed [O₃] give the dependence on ambient [H₂O] and on the modulating reagent [isobutane]. At ambient [O₃]=30 p.p.b. and 10 torr H₂O, with excitation and detection at a total pressure of 4 torr, the net interference is equal to [HO]=-1.3times10⁶ molecule cm⁻³.
Rights
Copyright 1992 by the American Geophysical Union
DOI
10.1029/91JD01664
Persistent Identifier
http://archives.pdx.edu/ds/psu/7633
Citation Details
Hard, T. M., Mehrabzadeh, A. A., Chan, C. Y., and O'Brien, R. J. (1992). FAGE measurements of tropospheric HO with measurements and model of interferences. Journal Of Geophysical Research, 97(D9), 9795-9817.
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