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North Pacific Upper-ocean Cold Temperature Biases in CMIP6 Simulations and Their Attributions to Roles of Regional Vertical Mixing
Yuchao Zhu1, 2, 3, Rong-Hua Zhang1, 2, 3, 4
1.CAS Key Laboratory of Ocean Circulation and Waves, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
2.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China
3.Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao, China
4.University of Chinese Academy of Sciences, Beijing, China
Substantial model biases are still prominent even in CMIP6 simulations; attributing their causes is defined as one of the three main scientific questions addressed in CMIP6. Cold temperature biases in the North Pacific subtropics are investigated using the simulations from the newly released CMIP6 models, together with other related modeling products. In addition, ocean-only simulations are performed to characterize the biases. Sensitivities to oceanic vertical mixing schemes are illustrated using ocean model simulations. Based on the Argo-derived diffusivity derived from the finescale method, idealized vertical diffusivity fields are designed to mimic the enhanced vertical mixing in the region. It is demonstrated that cold temperature biases can be greatly reduced. Further applications of this study are discussed.