Computer Science
Scientific paper
Aug 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006esasp.619...37s&link_type=abstract
Proceedings of the 3rd MSG RAO Workshop (ESA SP-619). 15 June 2006, Helsinki, Finland. Editor: D. Danessy, p.37
Computer Science
1
Scientific paper
Cloud amount and cloud properties are key parameters of the climate system. They need to be adequately monitored. A promising way of improving cloud property retrieval, is the combined use of new ensemble of data based on different measurement techniques. In the present study we focus on the comparison of cloud pressure distributions derived from four types of measurements: (1) the SEVIRI passive infrared measurements provided by the SAFNWC (Satellite Application Facility in support to NoWCasting ), (2) spectral polarization measurements, and (3) absorption measurements in the oxygene A-band from the passive radiometer POLDER2 (POLarization and Directionality of the Earth's Reflectances) on board the ADEOS2 platform and (4) measurements from the space lidar GLAS (Geoscience Laser Altimeter System) on board the ICESAT platform. The October 2003 period is selected as both data from POLDER2 and GLAS are available at this period. The SAFNWC SEVIRI cloud top pressure, the POLDER Rayleigh cloud top pressure and the POLDER Oxygene cloud pressure distributions show the same global features and differences than those observed in a first SEVIRI/POLDER comparison for severals days in June 2003. However, compared to the June 2003 results, for the October 2003 period, low cloud top pressure in the new version 1.2 of the SAFNWC SEVIRI products are closer to the POLDER Oxygene pressure. For high thick clouds, the SEVIRI and Rayleigh pressure are close. The more striking results of the preliminary comparison of the SEVIRI and space lidar GLAS cloud top pressure is that the cloud pressure distribution shapes are very similar over ocean as well as over land. As part of the A-train satellite constellation, PARASOL/POLDER has been launched in December 2004, the CALIPSO lidar and the CLOUDSAT radar have joined PARASOL and the A- Train in May 2006. Study of the relation between cloud properties observed from SEVIRI, POLDER and active measurements will be continued in this frame.
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