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Thermocline bulk shear analysis in the northern North Sea

机译：北海北部的温跃层整体剪切分析

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摘要

Thermocline bulk shear is investigated in the northern North Sea using historical observations. The conventional bulk shear is modified to define a thermocline bulk shear (TBS), in order to better represent the shear across the thermocline. The TBS computed by observed currents is decomposed into components at different frequency bands. The near-inertial TBS is the largest component. Its dominance is significant during the period of high wind. It is formed by the wind-driven near-inertial current which has a distinct phase shift (similar to 180A degrees) across the thermocline. A linear model is presented, which well simulates the observed near-inertial TBS, especially during the period of relatively strong wind. The semidiurnal TBS makes a secondary contribution to the total TBS. It is only slightly smaller than the near-inertial TBS when the wind is relatively weak. The large values of semidiurnal TBS are associated with semidiurnal currents which have a phase shift (similar to 30-40A degrees) or a magnitude difference (similar to 5 cm/s) across the thermocline. The low-frequency (< 0.7 cpd) TBS also makes an episodic contribution to the total. Its variation coincides with the Ekman transport during the period of relatively strong wind. The low-frequency TBS is mainly formed by an Ekman-like clockwise spiraling of velocity with depth or a distinct magnitude difference in velocities between upper and lower layers.
机译：使用历史观测资料对北海北部的温跃层整体剪切进行了研究。修改了常规的整体剪切机，以定义温跃线整体剪切力（TBS），以便更好地表示跨跃线的剪切。由观察到的电流计算出的TBS被分解为不同频带的分量。接近惯性的TBS是最大的组成部分。在强风时期，它的优势很明显。它是由风力驱动的近惯性电流形成的，该电流在整个温跃层上具有明显的相移（类似于180A度）。提出了一个线性模型，可以很好地模拟观察到的近惯性TBS，尤其是在相对强风期间。半日TBS对总TBS的贡献是次要的。当风相对弱时，它仅比近惯性TBS稍小。半昼夜TBS的较大值与半昼夜电流有关，该半昼夜电流在整个温跃层上具有相移（类似于30-40A度）或幅度差（类似于5 cm / s）。低频（<0.7 cpd）TBS也对总体产生了偶然的影响。其变化与强风时期的埃克曼运输相吻合。低频TBS主要由类似于Ekman的顺时针速度螺旋形成，其速度随深度或上层和下层之间的速度存在明显的幅度差异。

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  • 来源
    《Ocean Dynamics》 |2016年第4期|499-508|共10页
  • 作者

    Chen Shengli; Polton Jeff A.; Hu Jianyu; Xing Jiuxing;

  • 作者单位

    Tsinghua Univ, Grad Sch Shenzhen, Shenzhen Key Lab Coastal Ocean Dynam & Environm, Shenzhen 518055, Peoples R China|Natl Oceanog Ctr, Liverpool L3 5DA, Merseyside, England|Xiamen Univ, Coll Ocean & Earth Sci, State Key Lab Marine Environm Sci, Xiamen 361102, Peoples R China;

    Natl Oceanog Ctr, Liverpool L3 5DA, Merseyside, England;

    Xiamen Univ, Coll Ocean & Earth Sci, State Key Lab Marine Environm Sci, Xiamen 361102, Peoples R China;

    Tsinghua Univ, Grad Sch Shenzhen, Shenzhen Key Lab Coastal Ocean Dynam & Environm, Shenzhen 518055, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Thermocline bulk shear; Near-inertial; Semidiurnal; North Sea;

    机译：跃层整体剪切;近惯性;半日;北海;

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