Interdecadal changes in the relationship between Southern China winter-spring precipitation and ENSO
Interdecadal changes in the relationship between Southern China winter-spring precipitation and ENSO
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DOI：
10.1007/s00382-013-1947-x
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发表时间：
2014-09
期刊：
影响因子：
4.6
通讯作者：
Jiepeng Chen;Z. Wen;R. Wu;Zesheng Chen;P. Zhao
中科院分区：
文献类型：
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作者：
Jiepeng Chen;Z. Wen;R. Wu;Zesheng Chen;P. Zhao
1953-1973年厄尔尼诺（La Niña）年中国南方冬春降水偏多（偏少）。1974-1994年华南冬春降水与厄尔尼诺-南方涛动（ENSO）的关系减弱。1953-1973年华南降水偏多对应赤道中太平洋海温偏高。赤道中太平洋上升和华南上升两个异常垂直环流，西北太平洋下降有一个共同的分支，并伴有异常低层反气旋。1974-1994年华南降水偏多对应于南印度洋东部海温偏暖和西部海温偏冷。两个异常的垂直环流将华南降水与南印度洋东部海温异常联系起来，其中南印度洋东部和华南上空上升，北太平洋西部上空下降有一个共同的分支。分析表明，南印度洋海温异常对中国南方冬春降水有独立的贡献。华南冬春降水与ENSO关系的变化可能与南印度洋东部海温变率的增加和太平洋年代际振荡的调制有关。
Winter-spring precipitation in southern China tends to be higher (lower) than normal in El Niño (La Niña) years during 1953–1973. The relationship between the southern China winter-spring precipitation and El Niño-Southern Oscillation (ENSO) is weakened during 1974–1994. During 1953–1973, above-normal southern China rainfall corresponds to warmer sea surface temperature (SST) in the equatorial central Pacific. There are two anomalous vertical circulations with ascent over the equatorial central Pacific and ascent over southern China and a common branch of descent over the western North Pacific that is accompanied by an anomalous lower-level anticyclone. During 1974–1994, above-normal southern China rainfall corresponds to warmer SST in eastern South Indian Ocean and cooler SST in western South Indian Ocean. Two anomalous vertical circulations act to link southern China rainfall and eastern South Indian Ocean SST anomalies, with ascent over eastern South Indian Ocean and southern China and a common branch of descent over the western North Pacific. Present analysis shows that South Indian Ocean SST anomalies can contribute to southern China winter-spring precipitation variability independently. The observed change in the relationship between southern China winter-spring rainfall and ENSO is likely related to the increased SST variability in eastern South Indian Ocean and the modulation of the Pacific decadal oscillation.