New insights on OH: Measurements around and in clouds

Physics

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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.

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