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首页> 外文期刊>Journal of Physical Oceanography >An Adjoint Sensitivity Study of Buoyancy- and Wind-Driven Circulation on the New Jersey Inner Shelf
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An Adjoint Sensitivity Study of Buoyancy- and Wind-Driven Circulation on the New Jersey Inner Shelf

机译：新泽西州内层架上浮力和风循环的伴随敏感性研究

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摘要

Adjoint sensitivity analysis is used to study the New York Bight circulation tor three idealized situations: an unforced buoyant river plume, and upwelling and downwelling wind forcing. A derivation of adjoint sensitivity is presented that clarifies how the method simultaneously addresses initial, boundary, and forcing sensitivities. Considerations of interpretation and appropriate definitions of sensitivity scalar indices are discussed. The adjoint method identifies the oceanic conditions and forcing that are "dynamically upstream" to a region or feature of interest, as well as the relative roles of the prior ocean state, forcing, and dynamical influences. To illustrate the method, which is quite general, the authors consider coastal sea surface temperature (SST) variability and define the adjoint scalar index as the temporal-spatial mean squared SST anomaly on a segment of the New Jersey coast at the conclusion of a 3-day period. In the absence of wind, surface temperature advection dominates the SST anomaly with two sources of surface water identified. Downwelling winds amplify upstream advective influence. Sensitivity to temperature is separated into direct advection and the dynamic effect on density stratification and mixing. For upwelling conditions, this decomposition shows that coastal SST is controlled by both advection from the south and subsurface, but above the 5-m depth, and temperature-related density stratification between 5 and 15 m to 10 km offshore. By identifying the timing and location of ocean conditions crucial to subsequent prediction of specific circulation features, the adjoint sensitivity method has application to quantitative evaluation of observational sampling strategies.
机译：伴随灵敏度分析用于研究三种理想情况下的纽约海岸线环流：无力的浮力河羽，以及上，下风强迫。提出了伴随灵敏度的推导，它阐明了该方法如何同时解决初始灵敏度，边界灵敏度和强制灵敏度。讨论了敏感性标量指数的解释和适当定义的考虑。伴随方法确定了在感兴趣区域或特征“动态上游”的海洋条件和强迫，以及先前海洋状态，强迫和动态影响的相对作用。为了说明这种方法，该方法相当普遍，作者考虑了沿海海表温度（SST）的变化，并将伴随标量指数定义为新泽西州海岸段的时空均方平方SST异常，结论为3。天期间。在没有风的情况下，地表温度平流在海温异常中占主导地位，并确定了两个地表水源。下行风增强了上游对流的影响。对温度的敏感性分为直接对流和对密度分层和混合的动态影响。对于上升流条件，这种分解表明，沿海南海的海温受到南下平流的控制，但深度都在5 m以上，并且与温度相关的密度分层在离岸5至15 m至10 km之间。通过确定对特定环流特征的后续预测至关重要的海洋条件的时机和位置，伴随敏感性方法已应用于观测采样策略的定量评估。

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  • 来源
    《Journal of Physical Oceanography》 |2009年第7期|1652-1668|共17页
  • 作者

    Weifeng G. Zhang; John L. Wilkin; Julia C. Levin; Hernan G. Arango;

  • 作者单位

    Institute of Marine and Coastal Sciences, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 71 Dudley Road, New Brunswick, NJ 08901;

    Institute of Marine and Coastal Sciences, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 71 Dudley Road, New Brunswick, NJ 08901;

    Institute of Marine and Coastal Sciences, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 71 Dudley Road, New Brunswick, NJ 08901;

    Institute of Marine and Coastal Sciences, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 71 Dudley Road, New Brunswick, NJ 08901;

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