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Measurement of tropospheric/stratospheric transmission at 10–35 GHz for H2O retrieval in low Earth orbiting satellite links
Department of Radio and Space Science, Chalmers University of Technology, Göteborg, Sweden
Department of Radio and Space Science, Chalmers University of Technology, Göteborg, Sweden
Department of Radio and Space Science, Chalmers University of Technology, Göteborg, Sweden
Department of Radio and Space Science, Chalmers University of Technology, Göteborg, Sweden
Institute of Environmental Physics, University of Bremen, Bremen, Germany
Institute of Environmental Physics, University of Bremen, Bremen, Germany
Active microwave limb sounding is a possible technique for measuring water vapor in the upper troposphere and lower stratosphere, and here a first assessment of the retrieval capabilities of transmission measurements in the range 10–35 GHz is presented. The proposed observing system consists of a constellation of low Earth orbiters measuring atmospheric transmission at the frequencies 10.3, 17.2, and 22.6 GHz. The use of these relatively long wavelengths guarantees a minimal, for being a remote sensing technique, influence from scattering. The original objective of the measurements was to derive water vapor profiles, but the potential to retrieve the liquid water content of clouds was also identified during the study. Retrieval errors due to thermal noise, gain instability, and spectroscopic uncertainties were considered. With the assumed instrument characteristics a measurement precision for water vapor in the upper troposphere of 5–10% is obtained, with capability to observe through ice clouds and clouds with a low water content.
Received 5 March 2002; accepted 20 August 2002; published 13 June 2003.
Citation: (2003), Measurement of tropospheric/stratospheric transmission at 10–35 GHz for H2O retrieval in low Earth orbiting satellite links, Radio Sci., 38(4), 8069, doi:10.1029/2002RS002638.
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