Abstract
Historical studies have shown that summer rainfall in eastern China undergoes decadal variations, with three apparent changes in the late 1970s, 1992, and the late 1990s. The present observational study indicates that summer precipitation over eastern China likely underwent a change in the late 2000s, during which the main spatial pattern changed from negative–positive–negative to positive–negative in the meridional direction. This change in summer precipitation over eastern China may have been associated with circulation anomalies in the middle/upper troposphere. A strong trough over Lake Baikal created a southward flow of cold air during 2009–15, compared with 1999–2008, while the westward recession of the western Pacific subtropical high strengthened the moisture transport to the north, creating conditions that were conducive for more rainfall in the north during this period. The phase shift of the Pacific Decadal Oscillation in the late 2000s led to the Pacific–Japan-type teleconnection wave train shifting from negative to positive phases, resulting in varied summer precipitation over eastern China.
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Supported by the National (Key) Basic Research and Development (973) Program of China (2015CB953904 and 2012CB955900) and National Natural Science Foundation of China (41405077).
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Ren, Y., Song, L., Wang, Z. et al. A possible abrupt change in summer precipitation over eastern China around 2009. J Meteorol Res 31, 397–408 (2017). https://doi.org/10.1007/s13351-016-6021-2
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DOI: https://doi.org/10.1007/s13351-016-6021-2