The responses of East Asian Summer monsoon to the North Atlantic Meridional Overturning Circulation in an enhanced freshwater input simulation
The responses of East Asian Summer monsoon to the North Atlantic Meridional Overturning Circulation in an enhanced freshwater input simulation
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加强淡水输入模拟中东亚夏季风对北大西洋经向翻转环流的响应
DOI：
10.1007/s11434-009-0720-3
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发表时间：
2009-12
期刊：
影响因子：
--
通讯作者：
Li ShuangLin
中科院分区：
文献类型：
--
作者：
Gao YongQi;Guo Dong;Wang HuiJun;Yu Lei;Li ShuangLin
我们通过使用全耦合气候模型，在增强淡水输入实验（FW）中研究了东亚夏季风（EASM）对大西洋经向翻转环流（AMOC）减弱的响应及其机制。其反应是 EASM 减弱，其机制可解释如下。模拟减弱的AMOC导致北大西洋(NA)海面温度(SST)下降，相应地，北美地区出现异常高海平面气压(SLP)，进而增加了东热带太平洋(ETP)穿过赤道的东北表面风。异常的东北风随后引起ETP进一步上升和更强的空气/海洋热交换，从而导致东部热带海面异常冷却。结果，气候哈德利环流（HC）由于赤道以北ETP的空气异常强烈下沉而减弱，而赤道以北西热带太平洋（WTP）的沃克环流（WC）因上升流分支东移而加强。这一特征与WTP的异常辐合风相一致，并导致东亚夏季风减弱和东亚夏季降水（EASP）减少。此外，与之前的淡水实验相比表明，EASP 的强度可能会受到淡水添加量的影响。
We investigated the response of the East Asian Summer Monsoon (EASM) to a weakened Atlantic Meridional Overturning Circulation (AMOC) and its mechanism in an enhanced freshwater input experiment (FW) by using a fully-coupled climate model. The response was a weakened EASM and the mechanisms can be explained as follows. The simulated weakened AMOC resulted in a drop in sea surface temperature (SST) in the North Atlantic (NA) and, correspondingly, an anomalous high sea level pressure (SLP) over the North American regions, which in turn increased the northeast surface winds across the equator in the eastern tropical Pacific (ETP). The anomalous northeast winds then induced further upwelling in the ETP and stronger air/sea heat exchange, therefore leading to an anomalous cooling of the eastern tropical sea surface. As a result, the climatologic Hadley Circulation (HC) was weakened due to an anomalous stronger sinking of air in the ETP north of the equator, whereas the Walker Circulation (WC) in the western tropical Pacific (WTP) north of the equator was strengthened with an eastward-shifted upwelling branch. This feature was in agreement with the anomalous convergent winds in the WTP, and led to a weakened EASM and less East Asian summer precipitation (EASP). Furthermore, comparison with previous freshwater experiments indicates that the strength of EASP could be influenced by the magnitude of the added freshwater.
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影响因子：
5.8
作者：
Jiang Shangcheng;Ye Qian;Yang Xifeng;An Gang;Wu Xiangqiang
通讯作者：
Jiang Shangcheng;Ye Qian;Yang Xifeng;An Gang;Wu Xiangqiang
DOI：
10.1063/1.41925
发表时间：
2008-05
期刊：
--
影响因子：
--
作者：
W. Broecker
通讯作者：
W. Broecker
影响因子：
4.6
作者：
K. Dahl;A. Broccoli;R. Stouffer
通讯作者：
K. Dahl;A. Broccoli;R. Stouffer
影响因子：
5.8
作者：
Q. Wei-hong;Zhu Fen;Xie An;Ye Qian
通讯作者：
Q. Wei-hong;Zhu Fen;Xie An;Ye Qian
影响因子：
4.9
作者：
H. Douville;F. Chauvin;H. Broqua
通讯作者：
H. Douville;F. Chauvin;H. Broqua