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The sensitivity of numerical simulation to vertical mixing parameterization schemes: a case study for the Yellow Sea Cold Water Mass

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Journal of Oceanology and Limnology 2021年第1期39卷 64-78页

作者： Congcong BI Zhigang YAO Xianwen BAO Cong ZHANG Yang DING Xihui LIU Junru GUO College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Physical Oceanography Laboratory/CIMST Ocean University of China and Qingdao National Laboratory for Marine Science and TechnologyQingdao 266100China The First Institute of Oceanography Ministry of Natural ResourcesQingdao 266061China Laboratory for Regional Oceanography and Numerical Modeling Qingdao National Laboratory for Marine Science and TechnologyQingdao 266000China China National Environmental Monitoring Centre Beijing 100012China Operational Oceanography Institution Dalian Ocean UniversityDalian 116023China

The vertical mixing parameterization scheme,by providing the eff ects of some explicitly missed physical processes and more importantly closing the energy budgets,is a critical model component and therefore imposes signifi cant impacts on model *** Yellow Sea Cold Water Mass(YSCWM),as the most striking and unique phenomenon in the Yellow Sea during summer,is dramatically aff ected by vertical mixing process during its each stage and therefore seriously sensitive to the proper choice of parameterization *** this paper,a hindcast of YSCWM in winter of 2006 was implemented by using the Regional Ocean Modeling System(ROMS).Three popular parameterization schemes,including the level 2.5 Mellor-Yamada closure(M-Y 2.5),Generic Length Scale closure(GLS)and K-Profi le Parameterization(KPP),were tested and compared with each other by conducting a series of sensitivity model *** infl uence of diff erent parameterization schemes on modeling the YSCWM was then carefully examined and assessed based on these model *** reasonable thermal structure and its seasonal variation were well reproduced by all schemes,considerable diff erences could still be found among all experiments.A warmer and spatially smaller simulation of YSCWM,with very strong thermocline,appeared in M-Y 2.5 experiment,while a spatially larger YSCWM with shallow mixed layer was found in GLS and KPP *** all the experiments,the discrepancy,indicated by core temperature,appeared since spring,and grew gradually by the end of *** experiments also confi rmed that the increase of background diff usivity could eff ectively weaken the YSCWM,in either strength or *** wave,another contributor in upper layer,was found responsible for the shrinkage of YSCWM *** treatment of wave eff ect as an additional turbulence production term in prognostic equation was shown to be more superior to the strategy of directly increasing diff usivity fo

关键词： Yellow Sea Cold Water Mass(YSCWM) vertical mixing parameterizations thermocline background diff usivity surface wave induced mixing

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