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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/amt-2020-256
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2020-256
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  13 Jul 2020

13 Jul 2020

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This preprint is currently under review for the journal AMT.

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

Jörn Ungermann1,2, Irene Bartolome1, Sabine Grießbach3, Reinhold Spang1, Christian Rolf1, Martina Krämer1, Michael Höpfner4, and Martin Riese1 Jörn Ungermann et al.
  • 1IEK-7, Forschungszentrum Jülich GmbH, Germany
  • 2JARA, Forschungszentrum Jülich GmbH, Germany
  • 3Jülich Supercomputing Centre, Forschungszentrum Jülich GmbH, Germany
  • 4IMK, Karlsruher Institut für Technologie, Germany

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.

Jörn Ungermann et al.

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Jörn Ungermann et al.

Jörn Ungermann et al.

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Short summary
This study examines the potential of new IR limb imager instruments and tomographic methods for cloud detection purposes. Simple colour-ratio based methods are examined and compared against more involved non-linear convex optimization. In a second part, 3-D measurements of the air-borne limb sounder GLORIA taken during the Wave-driven ISentropic Exchange campaign are used to exemplary derive the location and extent of small-scale cirrus clouds with high spatial accuracy.
This study examines the potential of new IR limb imager instruments and tomographic methods for...
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