Physics – Optics
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3219815n&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 19, CiteID L19815
Physics
Optics
8
Atmospheric Processes: Remote Sensing, Atmospheric Composition And Structure: Cloud Optics, Atmospheric Composition And Structure: Instruments And Techniques
Scientific paper
This study reports on the first attempt to use cloud boundary and optical depth retrievals from the GLAS lidar to assess the accuracy of cloud-top heights obtained with MODIS (onboard NASA-TERRA and AQUA) and SEVIRI (onboard METEOSAT-8). Over the period from 25 September to 18 November 2003, MODIS-GLAS coincidences were only found in the Polar Regions, whilst SEVIRI-GLAS coincidences were available for a larger range of latitudes. For both passive instruments, cloud-top heights were overestimated by about 300-400 m when clouds were low and opaque. For high and thin clouds, MODIS and SEVIRI cloud-top heights were underestimated, and the bias increased with decreasing optical depth. For optical depths below 0.3, the number of misdetections increased significantly and the bias in cloud-top height increased from 1 to 2 km. The bias was found to be larger when lower cloud layers were present.
de Valk Paul
Müller Jan-Peter
Naud Catherine
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