Influence of the Northeast Cold Vortex on Flooding in Northeast China in Summer 2013

作     者：Jing GAO Hui GAO 

作者机构：Inner Mongolia Climate Center Hohhot 010051 National Climate Center China Meteorological Administration Beijing 100081 

出 版 物：《Journal of Meteorological Research》 (气象学报（英文版）)

年 卷 期：2018年第32卷第2期

页      面：172-180页

核心收录：

学科分类：07[理学] 070601[理学-气象学] 0706[理学-大气科学] 

基　　金：Supported by the National Basic Research Program of China(2013CB430203) Technology Innovation Project of the Inner Mongolia Meteorological Bureau(nmqxkjcx201606) Climate and Climate Change Innovation Team Project of the Inner Mongolia Meteorological Bureau 

主　　题：flood Northeast China Northeast Cold Vortex westem Pacific subtropical high 

摘      要：Severe flooding occurred in Northeast China（NEC） in summer 2013. 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. 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. Under this circulation pattern, more water vapor was transported to North China and NEC. Another moisture transport pathway to NEC was traced to the cross-equatorial flow over the Bay of Bengal. In mid–high latitudes in summer 2013, the Northeast Cold Vortex（NECV） was much stronger and remained stable over NEC. 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. Correlation analysis indicated that the NECV played a more direct role than the WPSH. Synoptic analyses of the two heaviest flood cases on 2 and 16 July confirmed this conclusion. 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.