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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Eddy-topography interactions and the fate of the Persian Gulf Outflow
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Eddy-topography interactions and the fate of the Persian Gulf Outflow

机译：涡流-地形相互作用与波斯湾外流的命运

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The Persian Gulf feeds a warm and salty outflow in the Gulf of Oman (northern Arabian Sea). The salt climatological distribution is relatively smooth in the Gulf of Oman, and the signature of a slope current carrying salty waters is difficult to distinguish hundreds of kilometers past the Strait of Hormuz, in contrast to other outflows of the world ocean. This study focuses on the mechanisms involved in the spreading of Persian Gulf Water (PGW) in the Gulf of Oman, using a regional primitive equation numerical simulation. The authors show that the dispersion of PGW occurs through a regime that is distinct from, for example, the one responsible for the Mediterranean outflow dispersion. The background mesoscale eddy field is energetic and participates actively to the spreading of PGW. Remotely formed eddies propagate into the Gulf of Oman and interact with the topography, leading to submesoscales formation and PGW shedding. Eddytopography interactions are isolated in idealized simulations and reveal the formation of intense frictional boundary layers, generating submesoscale coherent vortices (SCVs). Interactions take place at depths encompassing the PGW depth, thus SCVs trap PGW and contribute to its redistribution from the boundaries to the interior of the Gulf of Oman. The overall efficiency of these processes is confirmed by a strong contribution of eddy salt fluxes in the interior of the basin, and is quantified using particle statistics. It is found to be a highly dispersive regime, with an approximated eddy diffusivity of ~1700m~2 s~(-1).
机译：波斯湾为阿曼湾（阿拉伯海北部）的温暖咸水提供了补给。在阿曼湾，盐的气候分布相对平稳，与其他海洋外流形成鲜明对比的是，载有咸水的斜坡流的特征很难区分出霍尔木兹海峡以北数百公里。这项研究使用区域原始方程数值模拟，着重研究波斯湾水（PGW）在阿曼湾的扩散所涉及的机制。这组作者表明，PGW的分散是通过一种不同于例如地中海流出分散的机制的方式发生的。背景中尺度涡流场充满活力，并积极参与了PGW的传播。远程形成的涡流传播到阿曼湾并与地形相互作用，从而导致亚中尺度形成和PGW脱落。在理想的模拟中，涡流地形学相互作用被隔离，并揭示了强烈的摩擦边界层的形成，从而产生了亚中尺度的相干涡（SCV）。相互作用发生在包括PGW深度的深度处，因此SCV捕获了PGW并有助于其从边界向阿曼湾的内部重新分配。这些过程的整体效率通过盆地内部涡流盐通量的强大贡献而得到证实，并使用颗粒统计进行量化。它是一种高度分散的状态，涡流扩散率约为1700m〜2 s〜（-1）。

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