Title: The Relationship of the Atmospheric Heat Sources in Early Summer over East Asia-Pacific to the Abnormality of Precipitation in the Yangtze River Basin and Its Vicinity in July and August
Abstract: The relationship of the atmospheric heat source over East Asia-Pacific region to the summer precipitation anomalies in the Yangtze River basin and its vicinity is studied on the interannual scale together with the exploration of associated physical processes using the 1958-2000 NCEP/NCAR reanalysis data,the 1958-2000 precipitation data in China,and the 1958-1998 reconstructed monthly sea surface temperature data from NOAA.It is found that there exists a very good in-phase relation between the July precipitation anomalies in the Yangtze River basin and the August precipitation anomalies in the region between the Yangtze River and the Yellow River.These precipitation abnormalities are closely related to not only the summer atmospheric heat source anomalies over the North Pacific ocean and the eastern Tibetan Plateau,but also the May-June atmospheric heat source anomalies over the central and eastern tropical Pacific.That is,if there are positive(negative) heat source anomalies over the central and eastern equatorial Pacific,and negative(positive) anomalies over the tropical region north of the central equatorial Pacific during May-June,then positive(negative) precipitation anomalies occur in the middle and lower reaches of the Yangtze River basin in July and in the region between the Yangtze River and the Yellow River in August,but negative(positive) precipitation anomalies in southern China.The westward movement and extension of the anomalous heat source centers and the related anomalous vertical motion centers in the tropical central and eastern Pacific are the important physical processes responsible for the persistent abnormality of rainfall in July and August in central and eastern China.In addition,as a pre-signal,the favorable anomalous patterns of the sea surface temperature over the South China Sea and the western Pacific already show up in May and June for the abnormality of summer rainfall around the Yangtze River basin.
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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