First measurements of lower mesospheric wind by airborne microwave radiometry

Details First measurements of lower mesospheric wind by airborne microwave radiometry First measurements of lower mesospheric wind by airborne microwave radiometry

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3519802f&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 19, CiteID L19802

Physics

1

Atmospheric Processes: Mesospheric Dynamics, Atmospheric Processes: Remote Sensing, Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: General Circulation (1223)

Scientific paper

The Institute of Applied Physics operates an airborne microwave radiometer that measures the rotational transition line of water vapor at 183.3 GHz. A narrowband digital FFT spectrometer is used for the detection of the atmospheric signal with a channel resolution of 12 kHz. For the first time we measure lower mesospheric wind using the wind induced Doppler shift of the spectral line at its center. The Doppler frequency shift is calculated by the center of mass method allowing to retrieve the wind speed in the layer 55-70 km with a precision of 14 m/s. A good agreement with ECMWF operational reanalysis is found. We show that microwave remote sensing is an appropriate technique to fill the current experimental data gap in lower mesospheric winds. Precise wind measurements are of need to improve atmosphere circulation models and medium range weather forecasts.

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