Atmos. Chem. Phys. Discuss., 8, 1635-1671, 2008
www.atmos-chem-phys-discuss.net/8/1635/2008/
doi:10.5194/acpd-8-1635-2008
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Validation of stratospheric water vapour measurements from the airborne microwave radiometer AMSOS
S. C. Müller1, N. Kämpfer1, D. G. Feist2, A. Haefele1, M. Milz3,*, N. Sitnikov4, C. Schiller5, C. Kiemle6, and J. Urban7
1University of Bern, Bern, Switzerland
2Max-Planck-Institute for Biogeochemistry, Jena, Germany
3Institut für Meteorologie und Klimaforschung, Karlsruhe, Germany
4Central Aerological Observatory, Moscow Region, Russia
5Forschungszentrum Jülich GmbH, Jülich, Germany
6DLR, Institut fuer Physik der Atmosphaere, Oberpfaffenhofen, Germany
7Chalmers University of Technology, Göteborg, Sweden
*now at: Luleå Technical University, Kiruna, Sweden

Abstract. We present the validation of a water vapour dataset obtained by the Airborne Microwave Stratospheric Observing System AMSOS, a passive microwave radiometer operating at 183 GHz. Vertical profiles are retrieved from spectra by an optimal estimation method. The useful vertical range lies in the upper troposphere up to the mesosphere with an altitude resolution of 8 to 16 km and a horizontal resolution of about 57 km. Flight campaigns were performed once a year from 1998 to 2006 measuring the latitudinal distribution of water vapour from the tropics to the polar regions. The obtained profiles show clearly the main features of stratospheric water vapour in all latitudinal regions. Data are validated against a set of instruments comprising satellite, ground-based, airborne remote sensing and in-situ instruments. It appears that AMSOS profiles have a dry bias of 3–20%, when compared to satellite experiments. A good agreement with a difference of 3.3% was found between AMSOS and in-situ hygrosondes FISH and FLASH and an excellent matching of the lidar measurements from the DIAL instrument in the short overlap region in the upper troposphere.

Citation: Müller, S. C., Kämpfer, N., Feist, D. G., Haefele, A., Milz, M., Sitnikov, N., Schiller, C., Kiemle, C., and Urban, J.: Validation of stratospheric water vapour measurements from the airborne microwave radiometer AMSOS, Atmos. Chem. Phys. Discuss., 8, 1635-1671, doi:10.5194/acpd-8-1635-2008, 2008.
 
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