Explicit cloud-top entrainment parameterization in the global climate model ECHAM5-HAM
Item
Title (Dublin Core)
Explicit cloud-top entrainment parameterization in the global climate model ECHAM5-HAM
Description (Dublin Core)
New developments in the turbulence parameterization in the general circulation model ECHAM5-HAM are presented. They consist mainly of an explicit entrainment closure at the top of stratocumulus-capped boundary layers and the addition of an explicit contribution of the radiative divergence in the buoyancy production term. The impact of the new implementations on a single column model study and on the global scale is presented here. The parameterization has a "smoothing" effect: the abnormally high values of turbulence kinetic energy are reduced, both in the single column and in the Californian stratocumulus region. A sensitivity study with prescribed droplet concentration shows a reduction in the sensitivity of liquid water path to increasing cloud aerosol optical depth. We also study the effect of the new implementation on a Pacific cross-section. The entrainment parameterization leads to an enhanced triggering of the convective activity.
Creator (Dublin Core)
Siegenthaler-Le Drian, C.
Spichtinger, P.
Lohmann, U.
Date (Dublin Core)
2018-08-10
Type (Dublin Core)
Text
Format (Dublin Core)
application/pdf
Identifier (Dublin Core)
10.5194/acpd-11-1971-2011
https://acp.copernicus.org/preprints/acp-2010-923/
Source (Dublin Core)
eISSN: 1680-7324
Language (Dublin Core)
eng
