First near-global retrievals of OH rotational temperatures from satellite-based Meinel band emission measurements

Physics

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Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Pressure, Density, And Temperature, Atmospheric Composition And Structure: Instruments And Techniques, Global Change: Atmosphere (0315, 0325), Global Change: Remote Sensing

Scientific paper

For the first time near-global retrievals of mesopause OH rotational temperatures from satellite-borne Meinel band emission measurements are presented. The measurements of the OH (3-1) Meinel band near 1.5 micron were performed with the SCIAMACHY instrument on the European Space Agency's environmental satellite Envisat. The derived OH (3-1) rotational temperatures are shown to be in reasonable agreement with the CIRA (1986) atmosphere temperatures for the seasons and latitudes considered. The derived temperatures are in good agreement with ground-based measurements of the OH rotational temperature performed with a CEDAR Mesospheric Temperature Mapper (MTM) at Maui, Hawaii (21°N/204°E), with the GRound based Infrared P-branch Spectrometer I (GRIPS-I) at Hohenpeißenberg (47°N/11°E) and with GRIPS-II at Wuppertal (51°N/7°E). The SCIAMACHY limb nighttime observations provide a unique data set of near-global OH rotational temperature to study seasonal and geographical variations, dynamical processes and possibly long-term temperature trends, if an extended data set becomes available in the future.

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