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Interannual Variability of East Asian Summer Monsoon Simulated by CMIP3 and CMIP5 AGCMs
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Interannual Variability of East Asian Summer Monsoon Simulated by CMIP3 and CMIP5 AGCMs
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Journal Article
Interannual Variability of East Asian Summer Monsoon Simulated by CMIP3 and CMIP5 AGCMs
2014
Overview
The climatology and interannual variability of EastAsian summer monsoon (EASM) are investigated by using 13 atmospheric general circulation models (AGCMs) from phase 3 of the Coupled Model Intercomparison Project (CMIP3) and 19 AGCMs from CMIP5. The mean low-level monsoon circulation is reasonably reproduced in the multimodel ensemble mean (MME) of CMIP3 and CMIP5 AGCMs, except for a northward shift of the western Pacific subtropical high. However, the monsoon rainband known as mei-yu/baiu/changma (28°–38°N, 105°–150°E) is poorly simulated, although a significant improvement is seen from CMIP3 to CMIP5. The interannual EASM pattern is obtained by regressing the precipitation and 850-hPa wind on the observed EASM index. The observed dipole rainfall pattern is partly reproduced in CMIP3 and CMIP5 MME but with two deficiencies: weaker magnitude and southward shift of the dipole rainfall pattern. These deficiencies are closely related to the weaker and southward shift of the western Pacific anticyclone (WPAC). The simulation skill of the interannual EASM pattern has been significantly improved from CMIP3 to CMIP5 MME accompanied by the enhanced dipole rainfall pattern and WPAC. Analyses demonstrate that the tropical eastern Indian Ocean (IO) rainfall response to local warm SST anomalies and the associated Kelvin wave response over the Indo–western Pacific region are important to maintain the WPAC. A successful reproduction of interannual EASM pattern depends highly on the IO–WPAC teleconnection. The significant improvement in the interannual EASM pattern from CMIP3 to CMIP5 MME is also due to a better reproduction of this teleconnection in CMIP5 models.
Publisher
American Meteorological Society
Subject
/ Atmospheric circulation models
/ Atmospheric General Circulation Models
/ Climate
/ Climatology. Bioclimatology. Climate change
/ Datasets
/ Dipoles
/ Exact sciences and technology
/ Geophysics. Techniques, methods, instrumentation and models
/ Marine
/ Modeling
/ Monsoons
/ Oceans
/ Rain
/ Rainfall
/ Sea surface temperature anomalies
/ Summer
/ Wind
