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Influence of Abyssal Mixing on the Multilayer Circulation in the South China Sea

机译：深海混合对南海多层循环的影响

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摘要

By parameterizing the abyssal mixing as the exchange velocity (entrainment/detrainment) between the middle and deep layers of the South China Sea (SCS), its effects on the multilayer circulation are examined. Results indicate that the cyclonic circulation in the deep SCS appears only when the mixing induces an entrainment of at least 0.72 Sv (1 Sv equivalent to 10(6) m(3) s(-1)) from the deep to the middle layer, which is equivalent to a diapycnal diffusivity of 0.65 x 10(-3) m(2) s(-1) or a net input rate of gravitational potential energy (GPE) of 6.89 GW, respectively. It is also found that tidal mixing in the SCS is stronger than the threshold for the generation of the cyclonic abyssal circulation, but the pattern and evolution of the deep circulation and meridional overturning circulation also depend on the spatiotemporal variability of the mixing. Moreover, the abyssal mixing is able to intensify the anticyclonic circulation in the middle layer but weaken the cyclonic circulation in the upper layer. Vorticity analysis suggests that the upward net flux induced by the abyssal mixing leads to vortex stretching (squeezing) and modulates the pressure gradient by redistributing the layer thickness, hence affects the pattern and strength of the circulation in the middle (deep) layer of the SCS, respectively. The depth-integrated effect of the thickness variation can modulate the pressure gradient across all layers and hence influence the upper-layer circulation.
机译：通过参数化南海（SCS）中部和深层之间的交换速度（夹带/剥离）的复发混合，检查了对多层循环的影响。结果表明，只有当混合诱导至少0.72 sv（相当于10（6）（3）次（3）（3）（3）级（-1））的夹带时，才出现深SC中的旋风循环，其等于0.65×10（ - 3）米（-1）的二进延伸率，或者分别为6.89 GW的重力势能（GPE）的净输入速率。还发现SCS中的潮汐混合比生成旋风复血循环的阈值更强，但深循环和经透过循环的图案和演化也取决于混合的时空可变性。此外，深层混合能够加强中间层中的反旋气循环，但削弱了上层中的旋风循环。 Vorticity分析表明，通过重新分配层厚度，深度混合引起的向上净通量导致涡旋拉伸（挤压）和调节压力梯度，因此影响SCS中间（深）层中循环的图案和强度， 分别。厚度变化的深度综合效果可以调节所有层的压力梯度，因此影响上层循环。

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  • 来源
    《Journal of Physical Oceanography》 |2019年第12期|3045-3060|共16页
  • 作者

    Quan Qi; Xue Huijie;

  • 作者单位

    Chinese Acad Sci State Key Lab Trop Oceanog South China Sea Inst Oceanol Guangzhou Peoples R China|Southern Univ Sci & Technol Dept Ocean Sci & Engn Shenzhen Peoples R China;

    Chinese Acad Sci State Key Lab Trop Oceanog South China Sea Inst Oceanol Guangzhou Peoples R China|Chinese Acad Sci Inst South China Sea Ecol & Environm Engn Guangzhou Peoples R China|Univ Maine Sch Marine Sci Orono ME 04469 USA;

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

    Asia; Abyssal circulation; Diapycnal mixing; Ocean dynamics; Ocean models;

    机译：亚洲;深度循环;十进月混合;海洋动力学;海洋模型;

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