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Surface Matters: Limitations of Calipso V3 Aerosol Typing in Coastal Regions : Volume 7, Issue 2 (11/02/2014)

By Kanitz, T.

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Book Id: WPLBN0004000108
Format Type: PDF Article :
File Size: Pages 33
Reproduction Date: 2015

Title: Surface Matters: Limitations of Calipso V3 Aerosol Typing in Coastal Regions : Volume 7, Issue 2 (11/02/2014)  
Author: Kanitz, T.
Volume: Vol. 7, Issue 2
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: copernicus


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Kanitz, T., Zamorano, F., Baars, H., Casiccia, C., Wandinger, U., Althausen, D.,...Foth, A. (2014). Surface Matters: Limitations of Calipso V3 Aerosol Typing in Coastal Regions : Volume 7, Issue 2 (11/02/2014). Retrieved from

Description: Leibniz Institute for Tropospheric Research, Permoserstr. 15, 04318 Leipzig, Germany. In the CALIPSO data analysis the surface type (land/ocean) is used to augment the aerosol characterization. However, this surface-dependent aerosol typing prohibits a correct classification of sea-breeze-related marine aerosol over land. This might result in a systematic overestimation of the particle extinction coefficient and of the aerosol optical thickness (AOT) of up to a factor of 3.5 over land in coastal areas. We present a long-term comparison of CALIPSO and ground-based lidar observations of the aerosol conditions in the coastal environment of southern Latin America (Punta Arenas, Chile, 53° S), performed in December 2009–April 2010. Punta Arenas is almost entirely influenced by marine particles throughout the year, indicated by a rather low AOT of 0.02–0.04. However, we found an unexpectedly high fraction of continental aerosol in the aerosol types inferred by means of CALIOP observations and, correspondingly, too high particle extinction values. Similar features of the CALIOP data analysis are presented for four other coastal areas around the world. Since CALIOP data serve as important input for global climate models, the influence of this systematic error was estimated by means of simplified radiative-transfer calculations.

Surface matters: limitations of CALIPSO V3 aerosol typing in coastal regions

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