极地研究

极地研究

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Modeling Arctic Intermediate Water: The effects of Neptune parameterization and horizontal resolution

LI Xiang1,2*, SU Jie1,2, WANG Zeliang3 & ZHAO Jinping1,2   

  1. 1 Key Laboratory of Physical Oceanography, Ministry of Education, Qingdao 266003, China;
    2 College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;
    3 Bedford Institute of Oceanography, Department of Fisheries & Oceans, NS B2Y 4A2, Canada
  • 出版日期:1963-06-30 发布日期:1963-06-30
  • 通讯作者: LI Xiang

Modeling Arctic Intermediate Water: The effects of Neptune parameterization and horizontal resolution

LI Xiang1,2*,SU Jie1,2, WANG Zeliang3 & ZHAO Jinping1,2   

  1. 1 Key Laboratory of Physical Oceanography, Ministry of Education, Qingdao 266003, China;
    2 College of Physical and Environmental Oceanography, Ocean University of China, Qingdao 266100, China;
    3 Bedford Institute of Oceanography, Department of Fisheries & Oceans, NS B2Y 4A2, Canada
  • Online:1963-06-30 Published:1963-06-30
  • Contact: LI Xiang

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摘要： Arctic Intermediate Water (AIW), advected from the North Atlantic Ocean, has a potential influence on climate in the Arctic region, but is poorly simulated in coarse resolution models. In this study, a coupled ice-ocean model is used to investigate features of AIW by conducting two sensitivity experiments based on Neptune parameterization and horizontal resolution. The results show that both experiments improve the modeling of temperature profiles in the western Eurasian Basin, mainly as a result of more realistic volume and heat transport through the Fram Strait. Topographical flows are well reproduced using Neptune parameterization or a finer horizontal resolution. In the eddy-permitting model with relatively higher resolution, the velocity field is more realistic than in the Neptune parameterization model, and complex inflow and outflow belts of barotropic structure are well reproduced. The findings of this study suggest that increased model resolution, as provided by an eddy-resolving model, is needed to reproduce realistic circulation and thermohaline structure in the Arctic, since the Rossby radius of deformation is only several kilometers in the Arctic Ocean. This paper focuses on the external heat input rather than internal mixing process, and obtains a conclusion that the heat input from the Fram Strait is a main factor to reproduce AIW in the Eurasian Basin successfully, at least forthe western part.

关键词: Arctic modeling, Arctic Intermediate Water, Neptune parameterization, horizontal resolution

Abstract: Arctic Intermediate Water (AIW), advected from the North Atlantic Ocean, has a potential influence on climate in the Arctic region, but is poorly simulated in coarse resolution models. In this study, a coupled ice-ocean model is used to investigate features of AIW by conducting two sensitivity experiments based on Neptune parameterization and horizontal resolution. The results show that both experiments improve the modeling of temperature profiles in the western Eurasian Basin, mainly as a result of more realistic volume and heat transport through the Fram Strait. Topographical flows are well reproduced using Neptune parameterization or a finer horizontal resolution. In the eddy-permitting model with relatively higher resolution, the velocity field is more realistic than in the Neptune parameterization model, and complex inflow and outflow belts of barotropic structure are well reproduced. The findings of this study suggest that increased model resolution, as provided by an eddy-resolving model, is needed to reproduce realistic circulation and thermohaline structure in the Arctic, since the Rossby radius of deformation is only several kilometers in the Arctic Ocean. This paper focuses on the external heat input rather than internal mixing process, and obtains a conclusion that the heat input from the Fram Strait is a main factor to reproduce AIW in the Eurasian Basin successfully, at least forthe western part.

Key words: Arctic modeling, Arctic Intermediate Water, Neptune parameterization, horizontal resolution