Extinction coefficients retrieved in deep tropical ice clouds from lidar observations using a CALIPSO-like algorithm compared to in-situ measurements from the cloud integrating nephelometer during CRYSTAL-FACE

V. Noel; D. M. Winker; T. J. Garrett; M. McGill

doi:10.5194/acp-7-1415-2007

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Extinction coefficients retrieved in deep tropical ice clouds from lidar observations using a CALIPSO-like algorithm compared to in-situ measurements from the cloud integrating nephelometer during CRYSTAL-FACE

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Extinction coefficients retrieved in deep tropical ice clouds from lidar observations using a CALIPSO-like algorithm compared to in-situ measurements from the cloud integrating nephelometer during CRYSTAL-FACE

V. Noel, D. M. Winker, T. J. Garrett and M. McGill

Atmospheric chemistry and physics, Vol.7(5), pp.1415-1422

03/08/2007

DOI: 10.5194/acp-7-1415-2007

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Abstract

@This paper presents a comparison of lidar ratios and volume extinction coefficients in tropical ice clouds, retrieved using observations from two instruments: the 532-nm Cloud Physics Lidar (CPL), and the in-situ Cloud Integrating Nephelometer (CIN) probe. Both instruments were mounted on airborne platforms during the CRYSTAL-FACE campaign and took measurements up to 17 km. Coincident observations from two cases of ice clouds located on top of deep convective systems are compared. First, lidar ratios are retrieved from CPL observations of attenuated backscatter, using a retrieval algorithm for opaque cloud similar to one used in the recently launched CALIPSO mission, and compared to results from the regular CPL algorithm. These lidar ratios are used to retrieve extinction coefficient profiles, which are compared to actual observations from the CIN in-situ probe, putting the emphasis on their vertical variability. When observations coincide, retrievals from both instruments are very similar, in the limits of colocation. Differences are generally variations around the average profiles, and general trends on larger spatial scales are well reproduced. The two instruments agree well, with an average difference of less than 11% on optical depth retrievals. Results suggest the CALIPSO Deep Convection algorithm can be trusted to deliver realistic estimates of the lidar ratio, leading to good retrievals of extinction coefficients.

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Title: Subtitle: Extinction coefficients retrieved in deep tropical ice clouds from lidar observations using a CALIPSO-like algorithm compared to in-situ measurements from the cloud integrating nephelometer during CRYSTAL-FACE
Creators: V. Noel - Laboratoire de Météorologie Dynamique
D. M. Winker - Langley Research Center
T. J. Garrett - University of Utah
M. McGill - Goddard Space Flight Center
Resource Type: Journal article
Publication Details: Atmospheric chemistry and physics, Vol.7(5), pp.1415-1422
DOI: 10.5194/acp-7-1415-2007
ISSN: 1680-7316
eISSN: 1680-7324
Publisher: Copernicus Gesellschaft Mbh
Number of pages: 8
Language: English
Date published: 03/08/2007
Academic Unit: Physics and Astronomy; Chemical and Biochemical Engineering
Record Identifier: 9984276454402771

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