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首页> 外文期刊>Journal of Physical Oceanography >The Fate of North Atlantic Subtropical Mode Water in the FLAME Model
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The Fate of North Atlantic Subtropical Mode Water in the FLAME Model

机译：FLAME模型中北大西洋亚热带模式水的去向

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摘要

North Atlantic Subtropical Mode Water, also known as Eighteen Degree Water (EDW), has the potential to store heat anomalies through its seasonal cycle: the water mass is in contact with the atmosphere in winter, isolated from the surface for the rest of the year, and reexposed the following winter. Though there has been recent progress in understanding EDW formation processes, an understanding of the fate of EDW following formation remains nascent. Here, particles are launched within the EDW of an eddy-resolving model, and their fate is tracked as they move away from the formation region. Particles in EDW have an average residence time of ～10 months, they follow the large-scale circulation around the subtropical gyre, and stratification is the dominant criteria governing the exit of particles from EDW. After sinking into the layers beneath EDW, particles are eventually exported to the subpolar gyre. The spreading of particles is consistent with the large-scale potential vorticity field, and there are signs of a possible eddy-driven mean flow in the southern portion of the EDW domain. The authors also show that property anomalies along particle trajectories have an average integral time scale of ～3 months for particles that are in EDW and ～2 months for particles out of EDW. Finally, it is shown that the EDW turnover time for the model in an Eulerian frame (～3 yr) is consistent with the turnover time computed from the Lagrangian particles provided that the effects of exchange between EDW and the surrounding waters are included.
机译：北大西洋亚热带模式水，也称为十八度水（EDW），有可能在其季节性周期内存储热量异常：冬天，水质在冬季与大气接触，全年其余时间都与地表隔离，并于次年冬天重新曝光。尽管在了解EDW形成过程方面已有新进展，但对形成后EDW的命运的了解仍处于萌芽状态。在这里，粒子在涡旋解析模型的EDW中发射，并且随着它们离开形成区域而被追踪。 EDW中的颗粒平均停留时间约为10个月，它们遵循亚热带回旋周围的大规模环流，分层是控制EDW颗粒逸出的主要标准。在沉入EDW下方的层中之后，粒子最终被输出到亚极回转。粒子的散布与大规模的潜在涡度场一致，并且有迹象表明在EDW域的南部可能存在涡流驱动的平均流。作者还表明，沿着颗粒轨迹的性质异常对于处于EDW的颗粒具有约3个月的平均积分时间尺度，而对于来自EDW的颗粒具有约2个月的平均积分时间尺度。最后，证明了该模型在欧拉框架（〜3年）内的EDW转换时间与从拉格朗日粒子计算的转换时间一致，只要考虑到EDW与周围水体之间的交换作用。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第5期|1354-1371|共18页
  • 作者

    S. F. Gary; M. S. Lozier; Y.-O. KWON; J. J. Park;

  • 作者单位

    Division of Earth and Ocean Sciences, Duke University, Box 90227, Durham, NC 27708;

    Duke University, Durham, North Carolina;

    Woods Hole Oceanographic Institution, Woods Hole, Massachusetts;

    Kyungpook National University, Sangju, South Korea;

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