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首页> 外文期刊>Journal of Climate >Interdecadal Changes in the Relationship between ENSO, EAWM, and the Wintertime Precipitation over China at the End of the Twentieth Century
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Interdecadal Changes in the Relationship between ENSO, EAWM, and the Wintertime Precipitation over China at the End of the Twentieth Century

机译：enso，eawm与二十世纪末对中国冬季降水的关系的跨界变化

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The current study investigates the interdecadal changes in the relationship between the winter precipitation anomalies in southeastern China, El Nino-Southern Oscillation (ENSO), and the East Asian winter monsoon (EAWM) at the end of the twentieth century. It appears that the relationships between the interannual variability of the southeastern China winter precipitation and ENSO as well as EAWM are obviously weakened after 1998/99. The possible mechanisms accounting for this interdecadal change in the relationship have been examined by dividing the data into two subperiods [1980-98 (P1) and 1999-2015 (P2)]. The results indicate that, without the linear contribution of EAWM, ENSO only play a limited role in the variability of winter precipitation in southeastern China in both subperiods. In contrast, in P1, corresponding to an ENSO-independent weaker-than-normal EAWM, anomalous southerlies along coastal southeastern China associated with an anticyclone over the northwestern Pacific transport water vapor to China. However, in P2 the impact of EAWM on winter precipitation in southeastern China is weakened because of the regime shift of EAWM. The EAWM-related positive SLP anomalies over the North Pacific move eastward in P2, causing an eastward migration of the associated anomalous southerlies along its western flank and therefore cannot significantly contribute to the positive winter precipitation anomalies in southeastern China.
机译：目前的研究调查了中国东南部，El Nino-Southern振荡（ENSO）和二十世纪末的冬季降水异常与东亚冬季季风（EAWM）之间关系的跨临床变化。似乎1998/99后，中国东南冬季降水和ENSO以及eAWM之间的年际变异性之间的关系显然削弱了。通过将数据划分为两个亚主极[1980-98（P1）和1999-2015（P2）]，研究了该关系中的这种跨界改变的可能机制。结果表明，没有EAWM的线性贡献，ENSO在潜水期冬季降水的可变性中发挥了有限的作用。相比之下，在P1，对应于沿着西北地区沿海东南部的沿海东南部的欧盟独立的弱于正常的EAWM，异常的南部与西北太平洋运输水蒸汽相关联。然而，在P2中，由于EAWM的政权转变，EAWM对冬季降水的影响被削弱。与北太平洋的EAWM相关的阳性SLP异常在P2向东移动，导致与西部侧翼的相关的异常南部的向东迁移，因此不能显着促进中国东南部的正冬季降水异常。

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    《Journal of Climate》 |2017年第6期|共15页
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  • 正文语种 eng
  • 中图分类 气候学;
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