Spurious North Tropical Atlantic precursors to El Niño.

Spurious North Tropical Atlantic precursors to El Niño.
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北部的北热带大西洋前体向厄尔尼诺现象。

DOI:
10.1038/s41467-021-23411-6
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发表时间:
2021-05-25
影响因子:
16.6
通讯作者:
Timmermann A
Timmermann A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhang W;Jiang F;Stuecker MF;Jin FF;Timmermann A

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厄尔Niño-Southern涛动(ENSO)是全球气候年际变率的主要驱动因素,已知会影响北热带大西洋(NTA)海表温度(SST),特别是在北方春季。以往的研究侧重于统计上的超前-滞后关系,提出年际海温变率也可以以可预测的方式反馈ENSO。然而,这些研究并没有很好地解释ENSO的自相关,以及大西洋和太平洋海温及其相互作用是季节性调节的事实。这可能导致对因果关系的误解,以及错误地认定大西洋是ENSO的前体。在考虑了季节性、时变ENSO频率和温室变暖的情况下,我们重新审视了这一问题,证明了NTA海温和ENSO之间的相互相关特征与太平洋向大西洋的单向强迫是一致的,尽管对先行滞后关系的解释可能会提出相反的建议。有研究认为,北热带大西洋海面温度对厄尔尼诺-南方涛动(ENSO)的演变具有重要影响。在这里,作者认为观察到的统计数据与ENSO驱动大西洋气候变化完全一致,而不是相反。
The El Niño-Southern Oscillation (ENSO), the primary driver of year-to-year global climate variability, is known to influence the North Tropical Atlantic (NTA) sea surface temperature (SST), especially during boreal spring season. Focusing on statistical lead-lag relationships, previous studies have proposed that interannual NTA SST variability can also feed back on ENSO in a predictable manner. However, these studies did not properly account for ENSO’s autocorrelation and the fact that the SST in the Atlantic and Pacific, as well as their interaction are seasonally modulated. This can lead to misinterpretations of causality and the spurious identification of Atlantic precursors for ENSO. Revisiting this issue under consideration of seasonality, time-varying ENSO frequency, and greenhouse warming, we demonstrate that the cross-correlation characteristics between NTA SST and ENSO, are consistent with a one-way Pacific to Atlantic forcing, even though the interpretation of lead-lag relationships may suggest otherwise. It has been suggested that sea surface temperatures in the North Tropical Atlantic exert strong influence on the evolution of the El Nino Southern Oscillation (ENSO). Here, the authors argue that observed statistics are fully consistent with ENSO driving climate variations in the Atlantic and not vice versa.
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发表时间: 2013-08-16
影响因子: 5.2
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全球变暖削弱了热带大西洋-太平洋遥相关
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