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《Chinese Journal of Atmospheric Sciences》 2007-06
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The Dominant Modes of Intraseasonal Variability of Summer Monsoon Rain Belt over Eastern China

CHEN Lie-Ting1,ZONG Hai-Feng1,2,and ZHANG Qing-Yun11 State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 1000292 Graduate University of Chinese Academy of Sciences,Beijing 100049  
The dominant modes and temporal and spatial characteristics of the intraseasonal variability of summer monsoon rain belt are studied by using extended empirical orthogonal function(EEOF),wavelet transform,correlation and composite methods with 160-station monthly mean precipitation data(1951-2005) offered by the National Climate Centre of China Meteorological Administration.The climatic characteristics of dominant modes and their relationships with the western Pacific subtropical high intraseasonal variability are discussed.The results show that the intraseasonal variability of summer rain belt is not only multi-patterns,but multi-time scales.There are six dominant modes of the intraseasonal variability of summer rain belt.In order to give a brief features of seasonal northward movement of summer rain belt for different dominant modes,the six dominant modes are named respectively: flood pattern during Meiyu period,drought pattern in dog days,drought pattern during Meiyu period,south flooding/north drought pattern,normal pattern and south drought/north flooding pattern.The intraseasonal variation characteristics are as follows. Mode-1: The rain belt is located in the north of southern China in June.But it is more southward than normal in July and August,which leads to the main rain belt persisting longer than normal over the Yangtze River and its neighborhood and more floods over there.Mode-2: The rain belt stays south of the Yangtze River in June,jumps over the Yangtze River,comes to the Yellow River and its north in July and continues to stay there in August.The main rain belt stays more shortly than normal over the Yangtze River during the Meiyu period and stays north of China in mid-summer,which leads to droughts over the Yangtze River and Huaihe River valleys in mid-summer while floods over the Yellow River and its north.Mode-3: The rain belt is more northward than normal in June,and the rainfall is less in the north of southern China.And the main rain belt is more southward in July and August,moving between the Yangtze River and the Yellow River.They lead to less rainfall or droughts over the Yangtze River and Huaihe River valleys during the Meiyu period.Mode-4: The main rain belt stays over the Yangtze River in June.There are two rain belts over East China in July and August,but the largest rainfall anomaly region appears in South China,which leads to more floods in South China and drought to the north of the Yangtze River.Mode-5: The main rain belt moving northward and southward is close to climatological mean,the rain is timely in most regions of eastern China.Mode-6: The main rain belt stays over the Yangtze River and Huaihe River valleys,the Yellow River and Huaihe River valleys in June.The main rain belt moves northward to the Yellow River valley and its north in July.And the main belt retreats back to the regions between the Yangtze River and the Yellow River in August.The main rain belt is mainly to the north of the Yangtze River,which leads to more droughts in southern China and more floods in North China.These patterns on the whole embody variation characteristics of summer rain belt shifting abnormally over eastern China.On time scale,all of the six dominant modes have quasi-biennial years,3-5 years and quasi-eight years interannual oscillation,and quasi-decadal years,quasi-15 years,quasi-24 years and quasi-30 years interdecadal oscillation.But the predominant periods are different among these different modes,especially on interdecadal time scale. Result also shows that the western Pacific subtropical high seasonal variation is the most direct and main cause of the summer rain belt seasonal variability over eastern China.And different pattern of the western Pacific subtropical high seasonal variation has a good correspondence to the different dominant modes,weather and climatic characteristics.This study is the basic work for further discussing the physical processes of different modes formation of summer rain belt variation over eastern China.
【Fund】: 国家重点基础研究发展规划项目2004CB418303;; 中国科学院知识创新重要方向性项目KZCX3-SW-226;; 国家自然科学基金资助项目40523001
【CateGory Index】: P426.6
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