Diagnostic study of errors in the simulation of tropical continental precipitation in general circulation models

Srinivasan, J (2003) Diagnostic study of errors in the simulation of tropical continental precipitation in general circulation models. In: Annales Geophysicae, 21 (5). pp. 1197-1207.

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Abstract

A simple diagnostic model has been used to identify the parameters that induce large errors in the simulation of tropical precipitation in atmospheric General Circulation models (GCM). The GCM that have been considered are those developed by the National Center for Environmental Prediction (NCEP), the National Center for Atmospheric Research (NCAR) and the Japanese Meteorological Agency (JMA). These models participated in the phase II of the Atmospheric Model Inter-comparison Project (AMIP II) and simulated the climate for the period 1979 to 1995. The root mean-square error in the simulation of precipitation in tropical continents was larger in NCEP and NCAR simulations than in the JMA simulation. The large error in the simulation of precipitation in NCEP was due to errors in the vertical profile of water vapour. The large error in precipitation in NCAR in North Africa was due to an error in net radiation (at the top of the atmosphere). The simple diagnostic model predicts that the moisture converge is a nonlinear function of integrated water vapour. The large error in the interannual variance of rainfall in NCEP over India has been shown to be due to this nonlinearity.

Item Type:	Journal Article
Publication:	Annales Geophysicae
Publisher:	European Geosciences Union
Additional Information:	Copyright of this article belongs to European Geosciences Union
Keywords:	Meteorology and atmospheric dynamics (precipitation; tropical meteorology; convective processes)
Department/Centre:	Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited:	18 May 2009 05:37
Last Modified:	19 Sep 2010 04:53
URI:	http://eprints.iisc.ac.in/id/eprint/16809

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