Shift in the summer rainfall over the Yangtze River valley in the late 1970s
Shift in the summer rainfall over the Yangtze River valley in the late 1970s
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DOI：
10.1029/2001gl014523
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发表时间：
2002-05-15
影响因子：
5.2
通讯作者：
Ho, CH
中科院分区：
文献类型：
--
作者：
Gong, DY;Ho, CH
[1]1979年前后，长江中下游及整个华东地区的夏季降水经历了一次显著的体制转换。这种变化与北方太平洋500 hPa高度场（Phi 500）的同步跳跃式变化相一致。长江流域1958- 1999年的降水量与20 - 25 ° N、125 - 140 ° E的Phi 500有密切的相关关系，相关系数为0.66。1980年以来，西北太平洋副热带高压（SNPH）扩大、加强并向西南方向伸展。SNPH的变化与热带东太平洋和热带印度洋海表温度的变化有很强的相关性。这些海温异常以不同的超前时间先于Phi 500信号，并通过SNPH的变化对长江流域夏季降水的变化起主要作用。
[1] The summer rainfall over the middle- lower valley of the Yangtze River and over the whole eastern China experienced a notable regime shift in about 1979. This change is consistent with a simultaneous jump- like change in the 500 hPa geopotential height (Phi500) over the northern Pacific. The rainfall over the Yangtze River valley is closely related to the Phi500 averaged over the area 20degrees -25degreesN, 125degrees -140degreesE, with a correlation coefficient of 0.66 for the period 1958- 1999. Since 1980, the subtropical northwestern Pacific high (SNPH) has enlarged, intensified, and extended southwestward. The changes in the SNPH are strongly associated with the variations of the sea surface temperatures (SSTs) of the eastern tropical Pacific and tropical Indian Ocean. The anomalies of these SSTs, responsible primarily for the shift of the summer rainfall over the Yangtze River through the changes in SNPH, precede the Phi500 signals with different leading times.