Comparison between ATSR-2 stereo, MOS O2-A band and ground-based cloud top heights
A new method to retrieve cloud top heights stereoscopically using the dual-view facility of the Along Track Scanning Radiometer 2 (ATSR-2) instrument is assessed. This assessment is performed through a comparison of the cloud top heights obtained from ATSR-2 stereo and those derived from a 94-GHz radar, radiosonde profiles and independently from the Modular Optoelectronic Scanner (MOS) using the O2-A band. The data for this study were collected over the United Kingdom from September 1998-March 1999. The results show that the accuracy of the ATSR-2 stereo heights is generally as predicted on theoretical grounds, with the errors in the 1.6 µm and 0.65 µm stereo heights rarely exceeding 2 km. Case study periods with disagreements between the ATSR-2 heights and the ground-based retrievals are often due to the lack of precise match-ups between the ground-based and satellite scenes, while the MOS O2-A band is shown sometimes to miss the tops of high clouds. Evidence that the 11 µm channel is more sensitive to high clouds than originally thought is given and a future application of multi-spectral stereo cloud top heights is proposed.
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Document Type: Research Article
now at Columbia University, NASA Goddard Institute for Space Studies, New York, NY 10025, USA,Department of Geomatic Engineering, University College London (UCL), London WC1E 6BT, UK
now at Mail Stop 183-601, Jet Propulsion Laboratory, Pasadena, CA, 91109-8099, USA,Department of Geomatic Engineering, University College London (UCL), London WC1E 6BT, UK
Department of Geomatic Engineering, University College London (UCL), London WC1E 6BT, UK,now at Department of Space and Climate Physics, MSSL, UCL, Dorking, Surrey, RH5 6NT, UK
Department of Meteorology, 603 Walker Building, Pennsylvania State University, University Park, PA 16802, USA
Free University of Berlin, Institut fur Weltraum-wissenschaften, D-14195 Berlin, Germany,now at Deutscher Wetterdienst (DWD), Dept. Climate and Environment, D-63067 Offenbach, Germany
Free University of Berlin, Institut fur Weltraum-wissenschaften, D-14195 Berlin, Germany
Department of Meteorology, University of Reading, Reading, Berkshire, RG6 6AH, UK
Publication date: 2007-05-01
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