Middle-atmospheric wind measurements by the ground-based passive radiometer WIRA-C

Hagen, Jonas (2020). Middle-atmospheric wind measurements by the ground-based passive radiometer WIRA-C. (Dissertation, Institute of applied Physics, Faculty of Science)

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This thesis is dedicated to the measurement of wind in the middle-atmosphere, more precisely, zonal and meridional wind in the stratosphere and lower mesosphere from 30 to 70~km altitude. Dynamics in the middle atmosphere have an impact on life on Earth, by coupling to ozone chemistry and tropospheric weather systems. Nevertheless, measurements of middle-atmospheric wind speeds are surprisingly rare and continuous observations are difficult to achieve. Doppler microwave wind radiometry is capable to deliver such measurements by measuring the tiny Doppler shift introduced to thermal emission lines of atmospheric molecules due to the movement of air as wind.

This thesis is specifically concerned with the Wind Radiometer for Campaigns, WIRA-C, a replication and improvement of the prototype Wind Radiometer WIRA. It is a highly sensitive spectrometer that is capable to measure the weak thermal emission of middle-atmospheric molecules. It is ground-based and passive, meaning that it is easy to deploy and to operate remotely, especially also over extended periods of time.

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