Extratropical control of recent tropical Pacific decadal climate variability: a relay teleconnection

Extratropical control of recent tropical Pacific decadal climate variability: a relay teleconnection
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近期热带太平洋年代际气候变率的温带控制:中继遥相关

DOI:
10.1007/s00382-006-0198-5
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发表时间:
2006-10
期刊:
影响因子:
4.6
通讯作者:
Liu, Zhengyu
Liu, Zhengyu
中科院分区:
地球科学2区
文献类型:
--
作者:
Li, Chun;Sun, Yan;Wu, Lixin;Liu, Zhengyu

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观测表明,最近热带太平洋年代际气候变化往往通过快速耦合海洋-大气桥和慢速海洋隧道的中继遥相关与温带北太平洋相关。在北太平洋温带观测到的年代际风的推动下,海洋-大气耦合模型明确表明,温带年代际海表温度(SST)异常可能通过风-蒸发-海表温度(WES)耦合反馈传播到热带地区。 WES反馈不仅导致热带海温近同步变化,还迫使上层海洋经向翻转环流延迟调整,进一步维持热带海温变化。研究进一步表明,温带-热带遥相关为维持热带和温带北太平洋的年代际变化提供了正反馈。
Observations indicate that recent tropical Pacific decadal climate variability tends to be associated with the extratropical North Pacific through a relay teleconnection of a fast coupled ocean-atmosphere bridge and a slow oceanic tunnel. A coupled ocean-atmosphere model, forced by the observed decadal wind in the extratropical North Pacific, explicitly demonstrates that extratropical decadal sea surface temperature (SST) anomalies may propagate to the tropics through a coupled wind-evaporative-SST (WES) feedback. The WES feedback cannot only lead to a nearly synchronous change of tropical SST, but also force a delayed adjustment of the meridional overturning circulation in the upper ocean to further sustain the tropical SST change. The study further suggests that the extratropical–tropical teleconnection provides a positive feedback to sustain the decadal changes in both the tropical and extratropical North Pacific.
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