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The impact of oceanic processes on the transient climate response: a tidal forcing experiment

Acta Oceanologica Sinica 2020年第1期39卷 52-62页

作者： Yi Yu Hailong Liu Pengfei Lin Jian Lan Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 510275China State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China College of Earth Sciences University of Chinese Academy of SciencesBeijing 100049China College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266003China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao266071China

In this study, the impact of oceanic processes on the sensitivity of transient climate change is investigated using two sets of coupled experiments with and without tidal forcing, which are termed ExpTide and ExpControl,respectively. After introducing tidal forcing, the transient climate response(TCR) decreases from 2.32 K to 1.90 K,and the surface air temperature warming at high latitudes decreases by 29%. Large ocean heat uptake efficiency and heat storage can explain the low TCR in ExpTide. Approximately 21% more heat is stored in the ocean in ExpTide(1.10×10^24 J) than in ExpControl(0.91×10^24 J). Most of the large ocean warming occurs in the upper 1 000 m between 60°S and 60°N, primarily in the Atlantic and Southern Oceans. This ocean warming is closely related to the Atlantic Meridional Overturning Circulation(AMOC). The initial transport at mid-and high latitudes and the decline in the AMOC observed in ExpTide are both larger than those observed in ExpControl. The spatial structures of AMOC are also different with and without tidal forcing in present experiments. The AMOC in ExpTide has a large northward extension. We also investigated the relationship between AMOC and TCR suggested by previous studies using the present experiments.

关键词： tidal forcing transient climate response ocean heat uptake Atlantic Meridional Overturning Circulation

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