Decadal variation of summer rainfall in the yangtzehuaihe river valley and its relationship to atmospheric circulation anomalies over east asia and western north pacific |
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| Authors: | Wu Renguang Chen Lieting |
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| Institution: | Department of Meteorology, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 |
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| Abstract: | Decadal variations of summer rainfall during 1951 through 1990 are analyzed by using summer rainfall data of 160 stations
in China. Four major patterns of decadal variations are identified. The decadal variations of summer rainfall showed northward
shift in the eastern China from South China through the Yangtze-Huaihe River to North China. Summer rainfall in the Yangtze-Huaihe
River valley underwent two obvious decadal transitions during the 40 years: one from rainy period to drought period in the
end of the 1950's, the other from drought period to rainy period in the late 1970's.
Correspondingly, the atmospheric circulation over East Asia through the western North Pacific showed two similar obvious transitions.
The East Asian / Pacific (EAP) pattern switched from high index to low index in the end of the 1950's and from low index to
high index in the late 1970's, respectively. Hence, summer rainfall in the Yangtze-Huaihe River valley is closely associated
with the EAP pattern not only in the interannual variation but also in the decadal variation. |
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| Keywords: | Summer rainfall Decadal variation EAP pattern |
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