Enhanced relationship between the tropical Atlantic SST and the summertime western North Pacific subtropical high after the early 1980s
Enhanced relationship between the tropical Atlantic SST and the summertime western North Pacific subtropical high after the early 1980s
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DOI：
10.1002/2013jd021394
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发表时间：
2014-04
期刊：
影响因子：
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通讯作者：
C. Hong;Tao-Chi Chang;H. Hsu
中科院分区：
文献类型：
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作者：
C. Hong;Tao-Chi Chang;H. Hsu
北太平洋副热带高压（WNPSH）在20世纪80年代初以后表现出明显的增强。北印度洋（NIO）和赤道东太平洋的海表温度（SST）对增强西太平洋高压有显著的局地或远地影响，而大西洋海表温度的影响迄今尚未得到充分探讨。本文报道了一个新的发现：20世纪80年代初以后，热带大西洋(TA) -海温与西太平洋低气压之间的关系增强。回归研究表明，温暖的TA - SST产生了纬向翻转环流异常，在赤道中太平洋上空下降，在热带大西洋/东太平洋上空上升。赤道中太平洋上空的异常下降可能导致西侧低空反气旋异常，从而增强了西太平洋副高。这项新发现的一个含义是可预测性。众所周知的“春季可预测性障碍”（即厄尔尼诺Niño-Southern涛动（ENSO）的影响在北方春季急剧下降）并不适用于TA - SST/WNPSH关系。从北方春季开始，当ENSO影响持续减弱时，TA - SST表现出持续的高相关性。温度-海温将北方夏季的西海高压的可预测性延长了一个季节，比北方春季提前了一个季节。
The western North Pacific subtropical high (WNPSH) in boreal summer shows a remarkable enhancement after the early 1980s. Whereas the sea surface temperature (SST) in the North Indian Ocean (NIO) and the equatorial eastern Pacific had been noted to have remarkable local or remote effects on enhancing the WNPSH, the influence of the Atlantic SST, so far, is hardly explored. This article reports a new finding: enhanced relationship between the tropical Atlantic (TA)‐SST and the WNPSH after the early 1980s. Regression study suggests that the warm TA‐SST produced a zonally overturning circulation anomaly, with descending over the equatorial central Pacific and ascending over the tropical Atlantic/eastern Pacific. The anomalous descending over the equatorial central Pacific likely induced low‐level anticyclonic anomaly to the west and therefore enhanced the WNPSH. One implication of this new finding is for predictability. The well‐known “spring predictability barrier” (i.e., the influence of El Niño–Southern Oscillation (ENSO) falls dramatically during boreal spring) does not apply to the TA‐SST/WNPSH relationship. The TA‐SST shows consistently high correlation starting from boreal spring when the ENSO influence continues declining. The TA‐SST extends the predictability of the WNPSH in boreal summer approximately one season earlier to boreal spring.