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首页> 外文期刊>Journal of Physical Oceanography >Antarctic Intermediate Water and Subantarctic Mode Water Formation in the Southeast Pacific: The Role of Turbulent Mixing
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Antarctic Intermediate Water and Subantarctic Mode Water Formation in the Southeast Pacific: The Role of Turbulent Mixing

机译：东南太平洋的南极中间水和南极模式水形成：湍流混合的作用

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摘要

During the 2005 austral winter (late August-early October) and 2006 austral summer (February-mid-March) two intensive hydrographic surveys of the southeast Pacific sector of the Southern Ocean were completed. In this study the turbulent kinetic energy dissipation rate ∈, diapycnal diffusivity k, and buoyancy flux J_b are estimated from the CTD/O_2 and XCTD profiles for each survey. Enhanced k of O(10~(-3) to 10~(-4) m~2 s~(-1)) is found near the Subantarctic Front (SAF) during both surveys. During the winter survey, enhanced k was also observed north of the "subduction front," the northern boundary of the winter deep mixed layer north of the SAF. In contrast, the summer survey found enhanced k across the entire region north of the SAF below the shallow seasonal mixed layer. The enhanced k below the mixed layer decays rapidly with depth. A number of ocean processes are considered that may provide the energy flux necessary to support the observed diffusivity. The observed buoyancy flux (4.0 × 10~(-8) m~2 s~(-3)) surrounding the SAF during the summer survey is comparable to the mean buoyancy flux (0.57 × 10~(-8) m~2 s~(-3)) associated with the change in the interior stratification between austral summer and autumn, determined from Argo profiles. The authors suggest that reduced ocean stratification during austral summer and autumn, by interior mixing, preconditions the water column for the rapid development of deep mixed layers and efficient Antarctic Intermediate Water and Subantarctic Mode Water formation during austral winter and early spring.
机译：在2005年南半球冬季（8月下旬至10月初）和2006年南半球夏季（2月中旬至3月中旬），完成了两次关于南大洋东南太平洋地区的水文密集调查。在这项研究中，湍流动能耗散率ε，径向扩散系数k和浮力通量J_b是根据每次测量的CTD / O_2和XCTD曲线估算的。在两次调查中，亚亚热带锋面（SAF）附近都发现了O（10〜（-3）至10〜（-4）m〜2 s〜（-1））的增强k。在冬季调查中，在“俯冲锋”以北，即SAF冬季深层混合层的北边界，也观察到了增强的k。相比之下，夏季调查发现SAF以北整个区域中浅层季节性混合层以下的k增加。混合层下增强的k随深度迅速衰减。考虑到许多海洋过程可能会提供支持观测到的扩散率所必需的能量通量。夏季调查期间在SAF周围观测到的浮力通量（4.0×10〜（-8）m〜2 s〜（-3））与平均浮力通量（0.57×10〜（-8）m〜2 s）可比〜（-3））与南方夏季和秋季之间内部分层的变化有关，由Argo剖面确定。这组作者建议，通过内部混合，在夏季和秋季的南半球减少海洋分层，为水柱的快速发展提供了条件，以使深层混合层快速发展，并在南半球冬季和初春形成有效的南极中层水和亚南极模式水。

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  • 来源
    《Journal of Physical Oceanography》 |2010年第7期|P.1558-1574|共17页
  • 作者

    Bernadette M. Sloyan; Lynne D. Talley; Teresa K. Chereskin; Rana Fine; James Holte;

  • 作者单位

    Centre for Australian Weather and Climate Research, CSIRO, and CSIRO Wealth from Oceans National Research Flagships, Hobart, Tasmania, Australia CSIRO Marine and Atmospheric Research, GPO 1538, Hobart, TAS 7001, Australia;

    Scripps Institution of Oceanography, La Jolla, California;

    rnScripps Institution of Oceanography, La Jolla, California;

    rnRosenstiel School of Marine and Atmospheric Science, University of Miami, Miami, Florida;

    rnScripps Institution of Oceanography, La Jolla, California;

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