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The inter-comparison of SCIAMACHY and radar cloud top heights

The inter-comparison of SCIAMACHY and radar cloud top heights Alexander A. Kokhanovsky(1), C. Naud(2), A. Devasthale(3) (1)Institute of Remote Sensing, Bremen University Bremen, Germany (2) NASA GISS, New York, USA (3) Max Planck Institute for Meteorology, Hamburg, Germany

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The inter-comparison of SCIAMACHY and radar cloud top heights

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  1. The inter-comparison of SCIAMACHY and radar cloud top heights Alexander A. Kokhanovsky(1), C. Naud(2), A. Devasthale(3) (1)Institute of Remote Sensing, Bremen University Bremen, Germany (2) NASA GISS, New York, USA (3) Max Planck Institute for Meteorology, Hamburg, Germany alexk@iup.physik.uni-bremen.de

  2. CONTENTS • Rationale • Cloud retrievals using SACURA: the accuracy of the forward model • Inter-comparison study • Conclusions

  3. Rationale: The validation of satellite-derived cloud top heights is needed to establish the accuracy of a given technique for the CTH determination. This can be done either using highly accurate lidar or radar systems in space or on ground.

  4. CLOUD RETRIEVALS USING SACURA: THE ACCURACY OF THE FORWARD MODEL and the physical principles behind retrievals

  5. The cloud optical thickness determination: the physical principle Symbols-SCIATRAN

  6. The effective radius determination from a satellite

  7. The cloud top height determination from a satellite The physical principle behind the retrieval

  8. Teh cloud geometrical thickness/bottom height determination from a satellite Preliminary results !

  9. Inter-comparisons ARM SGP site USA 36.6N; 97.5W

  10. Radar: 35-GHz Millimeter wave Cloud Radar 25min 0.5deg ARM (USA): 36.6N; 97.5W

  11. Low clouds scia scia CF CF radar

  12. Low clouds scia scia CF CF radar

  13. High Clouds

  14. High Clouds

  15. The inter-comparisons of CTHs derived using SCIAMACHY, MODIS, and MERIS satellite radar

  16. Table 1. Cloud top heights (in km) of low-level clouds derived from radar and satellite data Table 1. Cloud top heights (in km) of low-level clouds derived from radar and satellite data Table 2. Cloud top heights (in km) of high-level clouds derived from radar and satellite data

  17. Statistical data: average CTH (km)

  18. Conclusions • The max error of the cloud top height retrievals for low clouds (below 2km) is in the range [-0.5km; 0.5km] • The max error for high clouds(10-12km) is in the range [-3km;+3km].

  19. AcknowledgementsJ. P. BurrowsW. von Hoyningen-HueneV. V. Rozanov, H. Bovensmann, M. Vountas, W. Lotz ESA, DLR

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