Preprints
https://doi.org/10.5194/acpd-11-1971-2011
https://doi.org/10.5194/acpd-11-1971-2011
20 Jan 2011
 | 20 Jan 2011
Status: this preprint was under review for the journal ACP. A revision for further review has not been submitted.

Explicit cloud-top entrainment parameterization in the global climate model ECHAM5-HAM

C. Siegenthaler-Le Drian, P. Spichtinger, and U. Lohmann

Abstract. 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.

C. Siegenthaler-Le Drian, P. Spichtinger, and U. Lohmann
 
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
 
Status: closed (peer review stopped)
Status: closed (peer review stopped)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
C. Siegenthaler-Le Drian, P. Spichtinger, and U. Lohmann
C. Siegenthaler-Le Drian, P. Spichtinger, and U. Lohmann

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