The role of ocean dynamics in tropical Pacific SST response to warm climate in a fully coupled GCM
The role of ocean dynamics in tropical Pacific SST response to warm climate in a fully coupled GCM
复制标题
全耦合 GCM 中海洋动力学在热带太平洋海温对温暖气候响应中的作用
DOI：
10.1029/2007gl033097
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发表时间：
2008-04-17
影响因子：
5.2
通讯作者：
Wu, Lixin
中科院分区：
文献类型：
--
作者：
Fang, Changfang;Wu, Lixin
利用热带纬向均匀热通量异常强迫的全球海洋-大气耦合GCM，研究了海洋动力在调节热带太平洋海温对温暖气候响应中的作用。与之前的CZ模式模拟结果一致，GCM模拟结果显示热带太平洋地区存在类似拉尼娜的响应，赤道上升流起主导作用。由于赤道温跃层的增强，平均上升流倾向于减少整体的地表变暖，而与东风增强相关的异常上升流则导致东部的弱变暖。这种偏东风异常的部分原因是赤道-副热带海温梯度增强，导致信风偏强。讨论了在全球变暖中的应用。
A global coupled ocean-atmosphere GCM forced by a zonally uniform heat flux anomaly in the tropics is used to investigate the role of oceanic dynamics in regulating the tropical Pacific SST response to warm climate. Consistent with earlier CZ model simulations, the GCM simulation demonstrates a La-Nina like response in the tropical Pacific, with the equatorial upwelling playing a dominant role. While the mean upwelling tends to reduce the overall surface warming due to the strengthening of the equatorial thermocline, the anomalous upwelling associated with the strengthening of the easterlies leads to a weak warming in the east. This easterly wind anomaly can be partly attributed to the enhanced equator-subtropical SST gradient which forces a stronger trade wind. Application to global warming is discussed.