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Summary: i
Tests of a Perturbed Physics Ensemble Approach for
Regional Climate Modeling
Zhiwei Yang and Raymond W. Arritt
Department of Agronomy, Iowa State University, Ames, Iowa
Revised version submitted to
Journal of Climate
April 30, 2002
Corresponding Author: Raymond W. Arritt, Department of Agronomy, Iowa State University,
Ames, Iowa 50011-1010. Email: rwarritt@iastate.edu
ii
Abstract
Ensemble simulations were performed with the RegCM2 regional climate model using
ranges of plausible values for two parameters in the deep convection scheme. The time scale for
release of convective instability was varied through a range of five values from 600 s to 7200 s,
and the maximum stable-layer depth between updraft origin and the level of free convection was
varied over five values from 50 hPa to 150 hPa, resulting in 25-member ensembles. Simulations
were integrated for two 60-day periods covering extremes of regional climate for the central
U.S., the severe drought in late spring-early summer of 1988 and the record flood of summer
1993.
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