TY  - JOUR
AU  - Ungermann, Jörn
AU  - Bartolome, Irene
AU  - Grießbach, Sabine
AU  - Spang, Reinhold
AU  - Rolf, Christian
AU  - Krämer, Martina
AU  - Höpfner, Michael
AU  - Riese, Martin
TI  - Cirrus cloud shape detection by tomographic extinction retrievals from infrared limb emission sounder measurements
JO  - Atmospheric measurement techniques discussions
VL  -  
SN  - 1867-8610
CY  - Katlenburg-Lindau
PB  - Copernicus
M1  - FZJ-2020-03174
SP  - 2020-256
PY  - 2020
AB  - Abstract. 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 example for a synthetic study, the new cloud index method is better in detecting the horizontal cloud extent 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 show even an improvement of 60 %. In a second step, the extinction retrieval is applied to real 3-D measurements of the air-borne limb sounder GLORIA taken during the Wave-driven ISentropic Exchange (WISE) campaign to retrieve small-scale cirrus clouds with high spatial accuracy.
LB  - PUB:(DE-HGF)16
DO  - DOI:10.5194/amt-2020-256
UR  - https://juser.fz-juelich.de/record/884282
ER  -