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Published February 28, 2014 | Published
Journal Article Open

Intermodel spread of East Asian summer monsoon simulations in CMIP5


In this paper we diagnose the intermodel spread in the Coupled Model Intercomparison Project Phase 5 (CMIP5) East Asian summer monsoon (EASM) simulations in the context of the moist static energy and moisture budgets. We find that the spatial distribution of the EASM precipitation simulated by different models is highly correlated with the meridional stationary eddy velocity, defined as the deviation from the long-term zonal mean. The correlation becomes more robust when energy fluxes into the atmospheric column are considered, consistent with recent observational analyses. The spread in the area-averaged rainfall amount can be partially explained by the spread in the simulated globally averaged precipitation, with the rest primarily due to the lower level meridional wind convergence. Clear relationships between precipitation and zonal and meridional eddy velocities are observed.

Additional Information

© 2014 American Geophysical Union. Issue published online: 19 MAR 2014; Article first published online: 19 FEB 2014; Accepted manuscript online: 31 JAN 2014 09:50AM EST; Manuscript Accepted: 24 JAN 2014; Manuscript Received: 11 DEC 2013. We acknowledge the World Climate Research Programme's Working Group on Coupled Modelling, which is responsible for CMIP, and we thank the climate modeling groups for producing and making available their model outputs. For CMIP the U.S. Department of Energy's Program for Climate Model Diagnosis and Intercomparison provides coordinating support and led the development of software infrastructure in partnership with the Global Organization for Earth System Science Portals. We use the NCAR Command Language (version 6.1.2, http://dx.doi.org/10.5065/D6WD3XH5) to create the plots and analyze the data. We thank Joan Ballester, Yen-Ting Hwang, and Paul Staten for their helpful suggestions on this manuscript and two anonymous reviewers for their constructive suggestions which have improved this manuscript. The Editor thanks two anonymous reviewers for their assistance in evaluating this paper.

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