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首页> 外文期刊>Journal of Physical Oceanography >Isohaline Salinity Budget of the North Atlantic Salinity Maximum
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Isohaline Salinity Budget of the North Atlantic Salinity Maximum

机译：北大西洋盐度最高值的异卤盐度预算

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摘要

In this study, the salinity budget of the North Atlantic subtropical salinity maximum region for control volumes bounded by isohaline surfaces is analyzed. The authors provide closed budgets based on output from a high-resolution numerical simulation and partial budgets based on analyses of observational climatologies of hydrography and surface fluxes. With this choice of control volume, advection is eliminated from the instantaneous volume-integrated salt budget, and time-mean advection is eliminated from the budget evaluated from time-averaged data. In this way, the role of irreversible mixing processes in the maintenance and variability of the salinity maximum are more readily revealed. By carrying out the analysis with both near-instantaneous and time-averaged model output, the role of mesoscale eddies in stirring and mixing for this water mass is determined. This study finds that the small-scale mixing acting on enhanced gradients generated by the mesoscale eddies is approximately equal to that acting on the large-scale gradients estimated from climatological-mean conditions. The isohaline salinity budget can be related to water mass transformation rates associated with surface forcing and mixing processes in a straightforward manner. The authors find that the surface net evaporation in the North Atlantic salinity maximum region accounts for a transformation of 7 Sverdrups (Sv; 1 Sv equivalent to 10(6) m(3) s(-1)) of water across the 37-psu isohaline outcrop into the salinity maximum in the simulation, whereas the estimate based on climatological observations is 9 to 10 Sv.
机译：在这项研究中，分析了北大西洋亚热带盐度最大区域的盐度预算，该盐度控制区域由等盐度表面界定。作者根据高分辨率数值模拟的输出提供封闭预算，并根据水文学和地表通量的观测气候分析提供部分预算。通过控制体积的这种选择，从瞬时体积积分盐预算中消除了对流，并且从时间平均数据评估的预算中消除了时间平均对流。以此方式，更容易揭示不可逆混合过程在最大盐度的维持和变化中的作用。通过对近乎瞬时和时间平均的模型输出进行分析，确定了中尺度涡旋在搅拌和混合中对该水团的作用。这项研究发现，作用于中尺度涡旋产生的增强梯度的小规模混合近似等于作用于根据气候平均条件估算的大尺度梯度的混合。等盐度盐度预算可以直接与表面强迫和混合过程相关的水质转化率相关。作者发现，北大西洋盐度最大区域的地表净蒸发量解释了在37 psu范围内转化了7个Sverdrups（Sv; 1 Sv相当于10（6）m（3）s（-1））的水。在模拟中，盐卤露头达到最大盐度，而根据气候观测得出的估算值为9至10 Sv。

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  • 来源
    《Journal of Physical Oceanography》 |2015年第3期|724-736|共13页
  • 作者

    Bryan Frank; Bachman Scott;

  • 作者单位

    Natl Ctr Atmospher Res, Climate & Global Dynam Div, Boulder, CO 80307 USA;

    Univ Cambridge, Dept Appl Math & Theoret Phys, Cambridge CB3 9EW, England;

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