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Deep circulation driven by strong vertical mixing in the Timor Basin

机译：东帝汶盆地强烈垂直混合带动的深层循环

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摘要

The importance of deep mixing in driving the deep part of the overturning circulation has been a long debated question at the global scale. Our observations provide an illustration of this process at the Timor Basin scale of similar to 1000 km. Long-term averaged moored velocity data at the Timor western sill suggest that a deep circulation is present in the Timor Basin. An inflow transport of similar to 0.15 Sv is observed between 1600 m and the bottom at 1890 m. Since the basin is closed on its eastern side below 1250 m depth, a return flow must be generated above 1600 m with a similar to 0.15 Sv outflow. The vertical turbulent diffusivity is inferred from a heat and transport balance at the basin scale and from Thorpe scale analysis. Basin averaged vertical diffusivity is as large as 1 x 10(-3) m(2) s(-1). Observations are compared with regional low-resolution numerical simulations, and the deep observed circulation is only recovered when a strong vertical diffusivity resulting from the parameterization of internal tidal mixing is considered. Furthermore, the deep vertical mixing appears to be strongly dependent on the choice of the internal tide mixing parameterization and also on the prescribed value of the mixing efficiency.
机译：在全球范围内，深层混合在推动深层循环中的重要性一直是争论不休的问题。我们的观察结果说明了帝汶盆地规模约1000 km的这一过程。帝汶西槛的长期平均系泊速度数据表明，帝汶盆地存在深层环流。在1600 m和1890 m的底部之间观察到类似于0.15 Sv的流入运移。由于该盆地在其深度低于1250 m的东侧是封闭的，因此必须在1600 m以上产生回水，并具有0.15 Sv的出水量。垂直湍流扩散率是根据盆地尺度的热和输运平衡以及索普尺度的分析得出的。盆地平均垂直扩散率高达1 x 10（-3）m（2）s（-1）。将观测结果与区域低分辨率数值模拟进行比较，并且只有在考虑内部潮汐混合参数化导致的垂直扩散性强时，才能恢复观测到的深水环流。此外，深度垂直混合似乎强烈依赖于内部潮汐混合参数化的选择以及混合效率的规定值。

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  • 来源
    《Ocean Dynamics》 |2017年第2期|191-209|共19页
  • 作者

    Cuypers Yannis; Pous Stephane; Sprintall Janet; Atmadipoera Agus; Madec Gurvan; Molcard Robert;

  • 作者单位

    Univ Paris 06, UPMC, Sorbonne Univ, CNRS,IRD,MNHN,LOCEAN Lab, 4 Pl Jussieu, F-75005 Paris, France;

    Univ Paris 06, UPMC, Sorbonne Univ, CNRS,IRD,MNHN,LOCEAN Lab, 4 Pl Jussieu, F-75005 Paris, France|Univ Cape Town, Dept Oceanog, Cape Town, South Africa;

    Scripps Inst Oceanog, La Jolla, CA USA;

    Bogor Agr Univ, Dept Marine Sci & Technol, Bogor, Indonesia;

    Univ Paris 06, UPMC, Sorbonne Univ, CNRS,IRD,MNHN,LOCEAN Lab, 4 Pl Jussieu, F-75005 Paris, France;

    Univ Paris 06, UPMC, Sorbonne Univ, CNRS,IRD,MNHN,LOCEAN Lab, 4 Pl Jussieu, F-75005 Paris, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Timor Basin; Vertical mixing; Deep circulation; Internal tide mixing parameterization;

    机译：东帝汶盆地;垂直混合;深层循环;内潮混合参数化;

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