Abstract
The present study examined the major features of the interdecadal variation of the summer rainfall over eastern China (IVRC) and the possible association with sea surface temperature (SST). We noted that the first leading mode of IVRC (accounting for nearly half of the total variance and with maximum loading for the summer rainfall anomalies over South China) may be not forced by SST. On the other hand, the second and third leading modes [accounting for 17.1 and 13.6 % of the total variance and mainly associated with the summer rainfall anomalies over the Yangtze River valley (YRV) and North China, respectively] in some extent are forced by SST anomalies. These observational results are confirmed by atmospheric general circulation model (AGCM) simulations forced by observed SST. By eliminating the internal dynamical process driven rainfall though ensemble mean, the simulations further suggest an overall enhancement of the intensity of IVRC in the corresponding ensemble mean, especially in the YRV and North China regions, but not in South China. That implies the different role of SST in driving IVRC over different regions.
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Acknowledgments
Most of this work was finished during a visit to the Climate Prediction Center, NCEP/NOAA. This research is jointly supported by the National Basic Research Program of China (2013CB430202, 2012CB955203), the National Natural Science Foundation of China (41405071) and the CMA Special Pubic Welfare Research Fund (GYHY201406001). Thanks also go to two anonymous reviewers for their constructive suggestions.
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Si, D., Hu, ZZ., Kumar, A. et al. Is the interdecadal variation of the summer rainfall over eastern China associated with SST?. Clim Dyn 46, 135–146 (2016). https://doi.org/10.1007/s00382-015-2574-5
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DOI: https://doi.org/10.1007/s00382-015-2574-5