Multidecadal modulation of El Nino-Southern Oscillation (ENSO) variance by Atlantic Ocean sea surface temperatures
Multidecadal modulation of El Nino-Southern Oscillation (ENSO) variance by Atlantic Ocean sea surface temperatures
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DOI：
10.1029/2006gl025766
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发表时间：
2006-04-19
影响因子：
5.2
通讯作者：
Scaife, AA
中科院分区：
文献类型：
--
作者：
Dong, BW;Sutton, RT;Scaife, AA
观测结果表明，大西洋多年代际涛动（AMO）与厄尔尼诺-南方涛动（ENSO）变率之间可能存在联系，而温暖的AMO阶段与ENSO变率较弱有关。一个耦合的海洋-大气模式被用来研究这种关系并阐明造成这种关系的机制。与正AMO相关的海温异常导致了热带太平洋基本状态的变化。这种基本状态变化与赤道太平洋的温跃层加深和垂直分层减少有关，这反过来又导致ENSO变率减弱。我们提出了一个将大西洋的影响迅速传递到热带太平洋的大气桥梁的作用。结果表明ENSO统计数据变化的非局地机制，并暗示大西洋海温异常可以调节太平洋平均气候和气候变率。
Observations suggest a possible link between the Atlantic Multidecadal Oscillation (AMO) and El Nino Southern Oscillation (ENSO) variability, with the warm AMO phase being related to weaker ENSO variability. A coupled ocean-atmosphere model is used to investigate this relationship and to elucidate mechanisms responsible for it. Anomalous sea surface temperatures (SSTs) associated with the positive AMO lead to change in the basic state in the tropical Pacific Ocean. This basic state change is associated with a deepened thermocline and reduced vertical stratification of the equatorial Pacific ocean, which in turn leads to weakened ENSO variability. We suggest a role for an atmospheric bridge that rapidly conveys the influence of the Atlantic Ocean to the tropical Pacific. The results suggest a non-local mechanism for changes in ENSO statistics and imply that anomalous Atlantic ocean SSTs can modulate both mean climate and climate variability over the Pacific.