State-of-the-art coupled general circulation models (CGCMs) are used to predict ocean heat uptake (OHU) and sea-level change under global warming. However, the projections of different models vary, resulting in high uncertainty. Much of the inter-model spread is driven by responses to surface heat perturbations. This study mainly focuses on the response of the ocean to a surface heat flux perturbation F, as prescribed by the Flux-Anomaly-Forced Model Intercomparison Project (FAFMIP). The results of ocean model were compared with those of a CGCM with the same ocean component. On the global scale, the changes in global mean temperature, ocean heat content (OHC), and steric sea level (SSL) simulated in the OGCM are generally consistent with CGCM simulations. Differences in changes in ocean temperature, OHC, and SSL between the two models primarily occur in the Arctic and Atlantic Oceans (AA) and the Southern Ocean (SO) basins. In addition to the differences in surface heat flux anomalies between the two models, differences in heat exchange between basins also play an important role in the inconsistencies in ocean climate changes in the AA and SO basins. These discrepancies are largely due to both the larger initial value and the greater weakening change of the Atlantic meridional overturning circulation (AMOC) in CGCM. The greater weakening of the AMOC in the CGCM is associated with the atmosphere–ocean feedback and the lack of a restoring salinity boundary condition. Furthermore, differences in surface salinity boundary conditions between the two models contribute to discrepancies in SSL changes.

Jiangbo JIN;Xiao DONG;Juanxiong HE;Yi YU;Hailong LIU;Minghua ZHANG;Qingcun ZENG;He ZHANG;Xin GAO;Guangqing ZHOU;Yaqi WANG

International Center for climate and Environment Sciences(ICCES),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics(LASG),Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100049,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;School of Marine and Atmospheric Sciences,Stony Brook University,Stony Brook,New York,NY 11790,USA

大气科学进展（英文版）

[1]Jiangbo JIN;Xiao DONG;Juanxiong HE;Yi YU;Hailong LIU;Minghua ZHANG;Qingcun ZENG;He ZHANG;Xin GAO;Guangqing ZHOU;Yaqi WANG-.Ocean Response to a Climate Change Heat-Flux Perturbation in an Ocean Model and Its Corresponding Coupled Model)[J].大气科学进展（英文版）,2022(01):55-66

CGCMs,OHU,FAFMIP,CGCM,OGCM

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