publication . Article . 2012

Improvements to a prognostic cloud scheme through changes to its cloud erosion parametrization

Cyril Morcrette;
Open Access
  • Published: 15 Mar 2012 Journal: Atmospheric Science Letters, volume 13, pages 95-102 (issn: 1530-261X, Copyright policy)
  • Publisher: Wiley
Abstract
A cloud erosion parametrization is developed for use in a prognostic cloud scheme in a general circulation model. Using geometrical considerations, the rate of evaporation of cloud due to unresolved mixing of clear and cloudy air is related to the cloud fraction, in a way that maximizes evaporation when the sky is half covered in cloud and reduces it to zero when the sky is overcast or clear. When used to simulate present-day climate with the Met Office Unified Model, this parametrization leads to several improvements in the cloud and radiation fields. © 2012 British Crown copyright, the Met Office. Published by John Wiley & Sons Ltd.
Subjects
arXiv: Astrophysics::Galaxy AstrophysicsPhysics::Atmospheric and Oceanic Physics
free text keywords: Atmospheric Science
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