Gao., 2015: Relationship between summer precipitation over northeastern China and sea surface temperature in the southeastern Pacific and the possible underlying mechanisms. Gao, 2014: Increased influences of the SST along the Kuroshio in previous winter on the summer precipitation in northeastern China. Wang, 2006: Anomalies of the Northeast China floods season precipitation and SVD analysis with SSTA in world oceans. Zhao, 2000: China’s Precipitation Prediction Research and Application in Flood Season. The four wettest summers in NEC before 2000 were also analyzed and the results were consistent with the conclusion that both the WPSH and the NECV led to the intense rainfall in NEC, but the NECV had a more direct role.Ĭhen, X. Synoptic analyses of the two heaviest flood cases on 2 and 16 July confirmed this conclusion. Correlation analysis indicated that the NECV played a more direct role than the WPSH. Thus, the cold air flow from its northwest side frequently met with the warm and wet air from the south to form stronger moisture convergence at lower levels in the troposphere, resulting in increased precipitation over the region. In mid–high latitudes in summer 2013, the Northeast Cold Vortex (NECV) was much stronger and remained stable over NEC. Another moisture transport pathway to NEC was traced to the cross-equatorial flow over the Bay of Bengal. Under this circulation pattern, more water vapor was transported to North China and NEC. During the summer season of 2013, the western Pacific subtropical high (WPSH) was located farther westward, which strengthened the southerly winds on its west side in the lower troposphere. Compared with the rainfall climatology of the region, the rainy season began earlier in 2013 and two main rainy periods occurred from late June to early July and from mid July to early August, respectively. Severe flooding occurred in Northeast China (NEC) in summer 2013.
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