Decadal Features of Heavy Rainfall Events in Eastern China  

作　　者：陈活泼 孙建奇 范可 

机构地区：[1]Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences [2]Climate Change Research Center, Chinese Academy of Sciences [3]Graduate University of Chinese Academy of Sciences

出　　处：《Acta meteorologica Sinica》2012年第3期289-303,共15页

基　　金：Supported by the National Science and Technology Support Program of China (2007BAC03A01);Strategic Priority Research Program on Climate Change of the Chinese Academy of Sciences (XDA05090306);National Basic Research and Development (973) Program of China (2012CB955401);National Natural Science Foundation of China (40905041)

摘　　要：Based on daily precipitation data, the spatial-temporal features of heavy rainfall events （HREs） during 1960-2009 are investigated. The results indicate that the HREs experienced strong decadal variability in the past 50 years, and the decadal features varied across regions. More HRE days are observed in the 1960s, 1980s, and 1999s over Northeast China （NEC）; in the 1960s, 1970s, and 1990s over North China （NC）; in the early 1960s, 1980s, and 2000s over the Huaihe River basin （HR）; in the 1970s 1990s over the mid-lower reaches of the Yangtze River valley （YR）; and in the 1970s and 1990s over South China （SC）. These decadal changes of HRE days in eastern China are closely associated with the decadal variations of water content and stratification stability of the local atmosphere. The intensity of HREs in each sub-region is also characterized by strong decadal variability. The HRE intensity and frequency co-vary on the long-term trend, and show consistent variability over NEC, NC, and YR, but inconsistent variability over SC and HR. Further analysis of the relationships between the annual rainfall and HRE frequency as well as intensity indicates that the HRE frequency is the major contributor to the total rainfall variability in eastern China, while the HRE intensity shows only relative weak contribution.Based on daily precipitation data, the spatial-temporal features of heavy rainfall events （HREs） during 1960-2009 are investigated. The results indicate that the HREs experienced strong decadal variability in the past 50 years, and the decadal features varied across regions. More HRE days are observed in the 1960s, 1980s, and 1999s over Northeast China （NEC）; in the 1960s, 1970s, and 1990s over North China （NC）; in the early 1960s, 1980s, and 2000s over the Huaihe River basin （HR）; in the 1970s 1990s over the mid-lower reaches of the Yangtze River valley （YR）; and in the 1970s and 1990s over South China （SC）. These decadal changes of HRE days in eastern China are closely associated with the decadal variations of water content and stratification stability of the local atmosphere. The intensity of HREs in each sub-region is also characterized by strong decadal variability. The HRE intensity and frequency co-vary on the long-term trend, and show consistent variability over NEC, NC, and YR, but inconsistent variability over SC and HR. Further analysis of the relationships between the annual rainfall and HRE frequency as well as intensity indicates that the HRE frequency is the major contributor to the total rainfall variability in eastern China, while the HRE intensity shows only relative weak contribution.

关 键 词：heavy rainfall events decadal variability eastern China atmosphere water content stratifica-tion stability 

分 类 号：P468.024[天文地球—大气科学及气象学]