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Influence of ice crystal shape on retrieval of cirrus optical thickness and effective radius: A case study

Eichler, Heike and Ehrlich, André and Wendisch, Manfred and Mioche, Guillaume and Gayet, Jean-Francois and Wirth, Martin and Emde, Claudia and Minikin, Andreas (2009) Influence of ice crystal shape on retrieval of cirrus optical thickness and effective radius: A case study. Journal of Geophysical Research, 114 (D19203), pp. 1-10. American Geophysical Union. DOI: 10.1029/2009JD012215.

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Abstract

Airborne measurements of spectral upwelling radiances (350�2200 nm) reflected by cirrus using the Spectral Modular Airborne Radiation measurement sysTem (SMART)-Albedometer were made over land and water surfaces. Based on these data, cloud optical thickness tau and effective radius Reff of the observed cirrus were retrieved. By using different crystal shape assumptions (hexagonal plates, solid and hollow columns, rough aggregates, planar and spatial rosettes, ice spheres, and a mixture of particle habits) in the retrieval, the influence of crystal shape on the retrieved tau and Reff was evaluated. With relative differences of up to 70%, the influence of particle habit on t is larger than on Reff (up to 20% differences). Retrieved tau values agreed with values derived from concurrent lidar measurements within the measurement uncertainties.

Document Type:Article
Title:Influence of ice crystal shape on retrieval of cirrus optical thickness and effective radius: A case study
Authors:
AuthorsInstitution or Email of Authors
Eichler, HeikeUniv. Mainz, Mainz
Ehrlich, AndréUniv. Leipzig, Leipzig
Wendisch, ManfredUniv. Leipzig, Leipzig
Mioche, GuillaumeUniv. Blaise Pascal, Clermont-Ferrand, F
Gayet, Jean-FrancoisUniv. Blaise Pascal, Clermont-Ferrand, F
Wirth, MartinUNSPECIFIED
Emde, ClaudiaUNSPECIFIED
Minikin, AndreasUNSPECIFIED
Date:3 October 2009
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:114
DOI:10.1029/2009JD012215
Page Range:pp. 1-10
Publisher:American Geophysical Union
Status:Published
Keywords:cirrus, ice, crystal, Falcon, CIRCLE-2
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Low-Emission Air Traffic (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Institute of Atmospheric Physics > Lidar
Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Andreas Minikin
Deposited On:02 Dec 2009 17:59
Last Modified:23 Jan 2014 11:36

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