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On the Origin of a Chain of Eddies in the Gulf of Eilat/Aqaba

机译：关于埃拉特/亚喀巴湾涡流链的起源

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摘要

The Gulf of Eilat/Aqaba is a terminal, elongated basin that exchanges water with the northern Red Sea via the Straits of Tiran. This study used energy budgets of mean kinetic energy (MKE) and eddy kinetic energy (EKE; differentiated by a simple horizontal averaging filter), instability analysis, and numerical simulations to study the horizontal circulation of the gulf, which is characterized by the existence of a chain of eddies along its main axis. The kinetic energy is predominantly in the form of EKE. Energy conversion between MKE and EKE is negligible where the main sources for both energy reservoirs are the conversions from the available potential energy (APE). This term is balanced by the work done by pressure at the straits in case of MKE and by dissipation in the case of EKE. The MKE balance represents the coupling between the exchange flow at the straits and the wintertime dense water formation. The dense water exits through the straits while sinking adiabatically along the gulf. The strong variation in the shoreline/bathymetry triggers a baroclinic instability that enhances the eddy activity in the gulf. Thus, the baroclinic instability is an effective mechanism that transfers energy from the APE to the EKE. The EKE-APE conversion terminvolves vertical adiabatic motions that occur through the upwelling of relatively warm water in anticyclonic circulation regions and downwelling of colder water in adjacent regions with cyclonic circulation. Through these processes, the horizontal circulation is powered by the energy transferred from the APE. This explains the coupling between the temperature gradient and the eddy formation along the gulf.
机译：埃拉特湾/亚喀巴湾是一个细长的终端盆地，可通过蒂兰海峡与北部红海交换水。这项研究使用平均动能（MKE）和涡动能（EKE;通过简单的水平平均滤波器加以区分）的能量预算，不稳定性分析和数值模拟来研究海湾的水平循环，其特征是存在沿其主轴线的涡流链。动能主要为EKE形式。 MKE和EKE之间的能量转换可以忽略不计，这两个储能库的主要来源都是来自可用势能（APE）的转换。在MKE情况下，海峡的压力与EKE情况下的耗散使该术语平衡。 MKE平衡代表了海峡两岸交换流量与冬季浓水形成之间的耦合。浓密的水通过海峡而绝热地沿着海湾沉没。海岸线/测深法的强烈变化触发了斜压不稳定，从而增强了海湾的涡流活动。因此，斜压不稳定是将能量从APE转移到EKE的有效机制。 EKE-APE转换项涉及垂直绝热运动，该运动是通过反旋风循环区域中相对温暖的水上升和旋风循环中相邻区域中的较冷水下降而发生的。通过这些过程，水平循环由APE传递的能量提供动力。这解释了温度梯度和沿海湾的涡流形成之间的耦合。

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  • 来源
    《Journal of Physical Oceanography》 |2016年第8期|2269-2284|共16页
  • 作者

    Biton Eli; Gildor Hezi;

  • 作者单位

    Israel Oceanog & Limnol Res, Dept Phys, Haifa, Israel;

    Hebrew Univ Jerusalem, Inst Earth Sci, Jerusalem, Israel;

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  • 正文语种 eng
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