Comparison of cloud top heights measured by airborne Lidar and TIROS-N image data |
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Authors: | KT Kriebel P Moerl ME Reinhardt R Schellhase T Koenig W Rattei |
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Institution: | 1. Institute for Atmospheric Physics 8031, Wessling, FRG;7. Applied Data Processing Division, DFVLR, Oberpfaffenhofen 8031, Wessling, FRG |
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Abstract: | The determination of the cloud top height by means of satelliteborne IR-radiometers requires the conversion of the measured radiance to an equivalent blackbody temperature and the assignment of this temperature to a geometrical height. The latter is associated with errors which add up easily to several kilometers. DFVLR did a case study to compare satellite derived cloud top heights with those from airborne Lidar measurements. The difference of the radiosonde temperature from the standard temperature profile results in a 1.8 km difference in cloud top height. The achievable accuracy using actual radiosonde temperatures is ± 0.4 km for optical thick clouds and much less for optical thin clouds. |
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