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North Atlantic subtropical mode water formation controlled by Gulf Stream fronts

National Science Review 2023年第9期10卷 214-223页

作者： Bolan Gan Jingjie Yu Lixin Wu Gokhan Danabasoglu R.Justin Small Allison H.Baker Fan Jia Zhao Jing Xiaohui Ma Haiyuan Yang Zhaohui Chen Frontier Science Center for Deep ocean Multispheres and Earth System(FDOMES) and Physical oceanography Laboratory Ocean University of China 2. Laoshan Laboratory National Center for Atmospheric Research CAS Key Laboratory of ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences

The North Atlantic ocean hosts the largest volume of global subtropical mode waters(STMWs) in the world,which serve as heat,carbon and oxygen silos in the ocean *** are formed in the Gulf Stream region where thermal fronts are pervasive and result in feedback with the ***,their roles in STMW formation have been *** eddy-resolving global climate simulations,we find that suppressing local frontal-scale ocean-to-atmosphere(FOA) feedback leads to STMW formation being reduced almost by *** is because FOA feedback enlarges STMW outcropping,attributable to the mixed layer deepening associated with cumulative excessive latent heat loss due to higher wind speeds and greater air-sea humidity contrast driven by the Gulf Stream *** enhanced heat loss overshadows the stronger restratification induced by vertical eddies and turbulent heat transport,making STMW colder and he *** more realistic representation of FOA feedback,the eddy-present/rich coupled global climate models reproduce the observed STMWs much better than the eddy-free *** improvement in STMW production cannot be achieved,even with the oceanic resolution solely refined but without coupling to the overlying atmosphere in oceanic general circulation *** findings highlight the need to resolve FOA feedback to ameliorate the common severe underestimation of STMW and associated heat and carbon uptakes in earth system mo dels.

关键词： North Atlantic subtropical mode water Gulf Stream thermal fronts frontal-scale ocean-to-atmosphere feedback eddy-resolving coupled global climate model

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