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Interdecaldal Variations of Drought and Flooding Disasters in China and Their Association with the East Asian Climate System

HUANG Rong-Hui~1,CAI Rong-Shuo~2,CHEN Ji-Long~1,and ZHOU Lian-Tong~1,1 Center for Monsoon System Research,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 1000802 Third Institute of Oceanography,State Oceanic Administration of China,Xiamen 361005  
The characteristics of the interdecadal variations of drought and flooding disasters in China are analyzed by using the observed data.The results show that the persistent droughts occurred in North China from 1976 to now,which seriously affected water resources and sustainable development of economy in this region.And the summer monsoon rainfall obviously increased and flooding disasters frequently occurred in the Yangtze River valley and the Huaihe River valley in this period.Moreover,the physical mechanism of the interdecadal variations of drought and flooding disasters occurring in China is analyzed from the interdecadal variability of the East Asian climate system.The analyzed results show that the SST increased and an interdecadal SST anomaly pattern which is similar to El Nio appeared in the tropical central and eastern Pacific from the late 1970s to now.This has caused not only the interdecadal variation of circulation anomaly distributions of the East AsiaPacific(EAP) pattern teleconnection over East Asia and the the western Pacific,which has led to the weakening of the East Asian summer monsoon and the southward and westward shifts of the western Pacific subtropical high,but also the interdecaldal variability of the Walker circulation over the tropics after 1976.And the results also show that the interdecadal variability of the Walker circulation from the late 1970s to now caused the intensification of descending flow in North Africa,which led to the intensification of the anticyclonic anomaly circulation in the Sahelian region and east of North Africa.And due to the propagation of quasi-stationary planetary waves,the intensification of anticyclonic anomaly circulation over the Sahelian region caused the appearance of an anticyclonic anomaly circulation over South China from the late 1970s.Besides,since an interdecadal variation for the circulation anomaly distributions of the Eurasian (EU) pattern teleconnection over middle and high latitudes also occurred in the late 1970s,an anticyclonic circulation anomaly distribution over North China was caused after 1976.These led to the weakening of the southerly monsoon flow reaching North China and the convergence of water vapor transport in the Yangtze River valley and the Huaihe River valley,thus,the interdecadal variation of droughts and floods was caused in China in the late 1970s.The analyzed results also indicate that the days and thickness of winter and spring snow cover in the Tibetan Plateau increased,and the difference between the ground surface temperature and surface air-temperature in spring in the arid and semi-arid areas of Northwest China became large from the late 1970s.These are helpful to the increase of summer monsoon rainfall in the Yangtze River valley and the Huaihe River valley and the decrease of summer rainfall in North China.
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