Cirrus cloud shape detection by tomographic extinction retrievals from infrared limb emission sounder measurements

Ungermann, Jörn; Bartolome, Irene; Griessbach, Sabine; Spang, Reinhold; Rolf, Christian; Krämer, Martina; Höpfner, Michael; Riese, Martin

An improved cloud-index-based method for the detection of clouds in limb sounder data is presented that exploits the spatial overlap of measurements to more precisely detect the location of (optically thin) clouds. A second method based on a tomographic extinction retrieval is also presented. Using CALIPSO data and a generic advanced infrared limb imaging instrument as examples for a synthetic study, the new cloud index method has a better horizontal resolution in comparison to the traditional cloud index and has a reduction of false positive cloud detection events by about 30 %. The results for the extinction retrieval even show an improvement of 60 %. In a second step, the extinction retrieval is applied to real 3-D measurements of the airborne Gimballed Limb Observer for Radiance Imaging in the Atmosphere (GLORIA) taken during the Wave-driven ISentropic Exchange (WISE) campaign to retrieve small-scale cirrus clouds with high spatial accuracy.

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Ungermann, Jörn / Bartolome, Irene / Griessbach, Sabine / et al: Cirrus cloud shape detection by tomographic extinction retrievals from infrared limb emission sounder measurements. 2020. Copernicus Publications.

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Rechteinhaber: Jörn Ungermann et al.

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