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Title of Journal: Clim Dyn

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Abbravation: Climate Dynamics

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Springer Berlin Heidelberg

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DOI

10.1016/j.bandl.2007.07.053

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1432-0894

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Using joint probability distribution functions to

Authors: Huikyo Lee Jinwon Kim Duane E Waliser Paul C Loikith Chris A Mattmann Seth McGinnis
Publish Date: 2014/07/24
Volume: 45, Issue: 1-2, Pages: 309-323
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Abstract

This study evaluates model fidelity in simulating relationships between seasonally averaged precipitation cloud fraction and surface insolation from the North American Regional Climate Change Assessment Project NARCCAP hindcast using observational data from ground stations and satellites Model fidelity is measured in terms of the temporal correlation coefficients between these three variables and the similarity between the observed and simulated joint probability distribution functions JPDFs in 14 subregions over the conterminous United States Observations exhibit strong negative correlations between precipitation/cloud fraction and surface insolation for all seasons whereas the relationship between precipitation and cloud fraction varies according to regions and seasons The skill in capturing these observed relationships varies widely among the NARCCAP regional climate models especially in the Midwest and Southeast coast regions where observations show weak or even negative correlations between precipitation and cloud fraction in winter due to frequent nonprecipitating stratiform clouds Quantitative comparison of univariate and JPDFs indicates that model performance varies markedly between regions as well as seasons This study also shows that comparison of JPDFs is useful for summarizing the performance of and highlighting problems with some models in simulating cloud fraction and surface insolation Our quantitative metric may be useful in improving climate models by highlighting shortcomings in the formulations related with the physical processes involved in precipitation clouds and radiation or other multivariate processes in the climate systemThe contributions by HK DEW PCL and CAM to this study were carried out on behalf of the Jet Propulsion Laboratory California Institute of Technology under a contract with the National Aeronautics and Space Administration This research was funded by NASA National Climate Assessment 11NCA110028 and AIST AISTQRS120002 projects and the NSF ExArch 1125798 PCL JK HL and DEW

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