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首页> 外文期刊>Journal of Physical Oceanography >Impact of Variable Atmospheric and Oceanic Form Drag on Simulations of Arctic Sea Ice
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Impact of Variable Atmospheric and Oceanic Form Drag on Simulations of Arctic Sea Ice

机译：可变大气和海洋形态阻力对北极海冰模拟的影响

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摘要

Over Arctic sea ice, pressure ridges and floe and melt pond edges all introduce discrete obstructions to the flow of air or water past the ice and are a source of form drag. In current climate models form drag is only accounted for by tuning the air-ice and ice-ocean drag coefficients, that is, by effectively altering the roughness length in a surface drag parameterization. The existing approach of the skin drag parameter tuning is poorly constrained by observations and fails to describe correctly the physics associated with the air-ice and ocean-ice drag. Here, the authors combine recent theoretical developments to deduce the total neutral form drag coefficients from properties of the ice cover such as ice concentration, vertical extent and area of the ridges, freeboard and floe draft, and the size of floes and melt ponds. The drag coefficients are incorporated into the Los Alamos Sea Ice Model (CICE) and show the influence of the new drag parameterization on the motion and state of the ice cover, with the most noticeable being a depletion of sea ice over the west boundary of the Arctic Ocean and over the Beaufort Sea. The new parameterization allows the drag coefficients to be coupled to the sea ice state and therefore to evolve spatially and temporally. It is found that the range of values predicted for the drag coefficients agree with the range of values measured in several regions of the Arctic. Finally, the implications of the new form drag formulation for the spinup or spindown of the Arctic Ocean are discussed.
机译：在北极海冰上，压力脊，絮凝物和融化的池塘边缘都对流经冰的空气或水流造成离散障碍，是形成阻力的源头。在当前的气候模型中，仅通过调整空冰和冰洋的阻力系数，即通过在表面阻力参数化过程中有效地更改粗糙度长度来解决阻力。现有的蒙皮阻力参数调节方法受观察的约束很有限，并且不能正确地描述与空冰和海冰阻力相关的物理学。在这里，作者结合最新的理论发展，从冰盖的性质（例如冰浓度，山脊的垂直范围和面积，干舷和絮凝物吃水以及絮凝物和融化池的大小）推导出总的中性形式阻力系数。阻力系数被纳入Los Alamos海冰模型（CICE）中，并显示了新阻力参数化对冰盖运动和状态的影响，最引人注目的是海冰在西边界的消耗。北冰洋和博福特海。新的参数化允许将阻力系数耦合到海冰状态，从而在空间和时间上发展。发现阻力系数的预测值范围与北极几个地区测得的值范围一致。最后，讨论了新形式阻力公式对北冰洋旋升或旋降的影响。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第5期|1329-1353|共25页
  • 作者

    Michel Tsamados; Daniel L. Feltham; David Schroeder; Daniela Flocco; SINEAD L. FARRELL; Nathan Kurtz; Seymour W. Laxon; Sheldon Bacon;

  • 作者单位

    Centre for Polar Observation and Modelling, Department of Meteorology, University of Reading, Reading, RG6 6BB, United Kingdom;

    Centre for Polar Observation and Modelling, Department of Meteorology, University of Reading, Reading, United Kingdom;

    Centre for Polar Observation and Modelling, Department of Meteorology, University of Reading, Reading, United Kingdom;

    Centre for Polar Observation and Modelling, Department of Meteorology, University of Reading, Reading, United Kingdom;

    Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, Maryland;

    Goddard Earth Science Technology and Research Program, Mergan State University, Baltimore, Maryland;

    Centre for Polar Observation and Modelling, University College London, London, United Kingdom;

    National Oceanography Center, University of Southampton, Southampton, United Kingdom;

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