Derivation of OH concentration from satellite infrared mesurements of NO2 and HNO3

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Atmospheric Chemistry, Atmospheric Composition, Hydroxyl Radicals, Satellite Sounding, Stratosphere, Air Pollution, Infrared Instruments, Nimbus 7 Satellite, Nitric Acid, Nitrogen Dioxide

Scientific paper

A cross-section of middle stratospheric OH was obtained with the limb IR monitor (LIMS) on Nimbus 7. Daytime LIMS data for NO2 and HNO3 were taken for 6 days in 1979, and used to infer the OH concentrations by means of equilibrium equations. Data for 28 derived OH profiles at about 32 deg N latitude are presented and compared with available in situ measurements and numerical predictions. Good agreement was found in the upper stratosphere, while the lower stratospheric (25-35 km) numerical prediction demonstrated that a better data base on atmospheric chemistry is needed in that region. The derivation method, using the satellite data and equilibrium equations, is projected to permit global characterization of stratospheric chemistry because of the broad spatial and temporal coverage offered.

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