Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.3033m&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 23, p. 3033-3036
Physics
21
Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Transmission And Scattering Of Radiation
Scientific paper
The first airborne measurements of OH performed in the lower free troposphere are presented. Measurements performed above clouds yielded large [OH], with values of 8-15×106moleculecm-3, compared with values of 3-5×106moleculecm-3 measured in cloud free regions. Measurements performed inside a cloud also yielded relatively high [OH], with values of 7.5×106moleculecm-3, yet a factor of 2 lower than 15×106moleculecm-3 measured just above the cloud. Steady state model calculations using Eppley scaled photolysis rates underestimate [OH] above clouds and overestimate [OH] inside clouds. Actinic fluxes of 2.5 times clear sky values (obtained from theoretical calculations) bring model values into agreement with those measured above clouds, while OH loss onto cloud droplets needs to be included for calculations inside clouds.
Eisele Fred L.
Flocke S. J.
Frost G. J.
Madronich Sasha
Mauldin R. L.
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