Indian Ocean Warming Trend Reduces Pacific Warming Response to Anthropogenic Greenhouse Gases: An Interbasin Thermostat Mechanism
Indian Ocean Warming Trend Reduces Pacific Warming Response to Anthropogenic Greenhouse Gases: An Interbasin Thermostat Mechanism
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DOI：
10.1029/2019gl084088
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发表时间：
2019-10
影响因子：
5.2
通讯作者：
Lei Zhang;W. Han;K. Karnauskas;G. Meehl;A. Hu;N. Rosenbloom;T. Shinoda
中科院分区：
文献类型：
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作者：
Lei Zhang;W. Han;K. Karnauskas;G. Meehl;A. Hu;N. Rosenbloom;T. Shinoda
热带印度洋海面温度的变暖趋势比热带太平洋更大，这是在各种观测数据集中发现的一个强有力的特征。然而，气候模型中并不存在这种流域间变暖的对比。在这里，我们通过分析耦合模型起搏器实验的结果，研究热带印度洋变暖对热带太平洋对人为温室气体变暖的反应的影响。我们发现印度洋变暖导致局部海平面负压异常，并延伸到热带西部，加强了热带太平洋的纬向海平面气压梯度和东风贸易。增强的信风通过增加赤道上升流和蒸发冷却降低了热带东部太平洋的海面温度，从而抵消了温室气体变暖。这一结果表明了一种跨流域恒温机制，印度洋通过该机制对太平洋对人为温室气体变暖的反应产生影响。
A greater warming trend of sea surface temperature in the tropical Indian Ocean than in the tropical Pacific is a robust feature found in various observational data sets. Yet this interbasin warming contrast is not present in climate models. Here we investigate the impact of tropical Indian Ocean warming on the tropical Pacific response to anthropogenic greenhouse gas warming by analyzing results from coupled model pacemaker experiments. We find that warming in the Indian Ocean induces local negative sea level pressure anomalies, which extend to the western tropical Pacific, strengthening the zonal sea level pressure gradient and easterly trades in the tropical Pacific. The enhanced trade winds reduce sea surface temperature in the eastern tropical Pacific by increasing equatorial upwelling and evaporative cooling, which offset the greenhouse gas warming. This result suggests an interbasin thermostat mechanism, through which the Indian Ocean exerts its influence on the Pacific response to anthropogenic greenhouse gas warming.