Comparison of stochastic parametrization approaches in a single-column model

Author:

Ball Michael A1,Plant Robert S1

Affiliation:

1. Department of Meteorology, University of ReadingPO Box 243, Reading, Berkshire RG6 2BB, UK

Abstract

We discuss and test the potential usefulness of single-column models (SCMs) for the testing of stochastic physics schemes that have been proposed for use in general circulation models (GCMs). We argue that although single-column tests cannot be definitive in exposing the full behaviour of a stochastic method in the full GCM, and although there are differences between SCM testing of deterministic and stochastic methods, SCM testing remains a useful tool. It is necessary to consider an ensemble of SCM runs produced by the stochastic method. These can be usefully compared with deterministic ensembles describing initial condition uncertainty and also with combinations of these (with structural model changes) into poor man's ensembles. The proposed methodology is demonstrated using an SCM experiment recently developed by the GCSS (GEWEX Cloud System Study) community, simulating transitions between active and suppressed periods of tropical convection.

Publisher

The Royal Society

Subject

General Physics and Astronomy,General Engineering,General Mathematics

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