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Orographic cirrus in the global climate model ECHAM5

Joos, Hanna and Spichtinger, Peter and Lohmann, Ulrike and Gayet, Jean-Francois and Minikin, Andreas (2008) Orographic cirrus in the global climate model ECHAM5. Journal of Geophysical Research, 113 (D18205), pp. 1-13. DOI: 10.1029/2007JD009605.

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Official URL: http://www.agu.org/journals/jd/

Abstract

A comparison of satellite data with simulations from global circulation models shows that there is a lack of cirrus cloud amount in large-scale models above and in the lee of mountains. The formation of orographic cirrus clouds due to gravity waves is usually not parameterized in large-scale models. To improve the simulation of such orographically excited cirrus clouds a coupling of the gravity wave dynamics and the cloud microphysics has been implemented in the climate model European Centre/Hamburg 5 (ECHAM5). As homogeneous freezing of solution droplets strongly depends on the vertical velocity, an increased vertical velocity due to gravity wave activity in the upper troposphere leads to the formation of cirrus clouds with higher ice crystal number densities. A comparison of the new parameterization with measurements shows a better agreement with observations.

Document Type:Article
Title:Orographic cirrus in the global climate model ECHAM5
Authors:
AuthorsInstitution or Email of Authors
Joos, HannaETH Zurich, Zurich, CH
Spichtinger, PeterETH Zurich, Zurich, CH
Lohmann, UlrikeETH Zurich, Zurich, CH
Gayet, Jean-FrancoisUniv. Blaise Pascal, Clermont-Ferrand, F
Minikin, AndreasUNSPECIFIED
Date:2008
Journal or Publication Title:Journal of Geophysical Research
Volume:113
DOI:10.1029/2007JD009605
Page Range:pp. 1-13
Status:Published
Keywords:ECHAM5, cirrus, climate model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L - no assignement
DLR - Research theme (Project):L -- no assignement
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Dr.rer.nat. Andreas Minikin
Deposited On:18 Nov 2008
Last Modified:12 Dec 2013 20:34

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