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首页> 外文期刊>Journal of Climate >Impact of East Asian winter and Australian summer Monsoons on the enhanced surface westerlies over the western tropical Pacific Ocean preceding the El Nino onset.
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Impact of East Asian winter and Australian summer Monsoons on the enhanced surface westerlies over the western tropical Pacific Ocean preceding the El Nino onset.

机译：在厄尔尼诺现象发生之前，东亚冬季和澳大利亚夏季风对西部热带太平洋上空西风增强的影响。

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摘要

Composite analysis from NCEP-NCAR reanalysis datasets over the period 1948-2007 indicates that stronger East Asian winter monsoons (EAWM) and stronger Australian summer monsoons (ASM) generally coexist in boreal winters preceding the onset of El Nino, although the EAWM tend to be weak after 1990, probably because of the decadal shift of EAWM and the change in El Nino events from cold-tongue type to warm-pool type. The anomalous EAWM and ASM enhance surface westerlies over the western tropical Pacific Ocean (WTP). It is proposed that the enhanced surface westerlies over the WTP prior to El Nino onset are generally associated with the concurrent anomalous EAWM and ASM. A simple analytical atmospheric model is constructed to test the hypothesis that the emergence of enhanced surface westerlies over the WTP can be linked to concurrent EAWM and ASM anomalies. Model results indicate that, when anomalous northerlies from the EAWM converge with anomalous southerlies from the ASM, westerly anomalies over the WTP are enhanced. This result provides a possible explanation of the co-impact of the EAWM and the ASM on the onset of El Nino through enhancing the surface westerly over the WTP.
机译：1948-2007年间来自NCEP-NCAR再分析数据集的综合分析表明，在厄尔尼诺现象发生之前，北亚冬季通常共存较强的东亚冬季风（EAWM）和澳大利亚夏季风（ASM），尽管EAWM倾向于1990年之后的疲软，可能是因为EAWM年代际变化和厄尔尼诺现象从冷舌型转变为暖池型。异常的EAWM和ASM增强了西部热带太平洋（WTP）的表面西风。有人提出，厄尔尼诺现象发生之前在WTP上增强的表面西风通常与并发的异常EAWM和ASM有关。构建了一个简单的大气分析模型，以测试以下假设：WTP上增强的表面西风的出现可以与并发的EAWM和ASM异常联系在一起。模型结果表明，当EAWM的北风异常与ASM的南风异常融合时，WTP上的西风异常会增强。通过增强WTP的表面西风，该结果提供了EAWM和ASM对El Nino发作的共同影响的可能解释。

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