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首页> 外文期刊>Journal of Physical Oceanography >Southern Ocean Seasonal Restratification Delayed by Submesoscale Wind-Front Interactions
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Southern Ocean Seasonal Restratification Delayed by Submesoscale Wind-Front Interactions

机译：亚亚尺度风前相互作用对南大洋季节性再定化的延迟

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摘要

Ocean stratification and the vertical extent of the mixed layer influence the rate at which the ocean and atmosphere exchange properties. This process has direct impacts for anthropogenic heat and carbon uptake in the Southern Ocean. Submesoscale instabilities that evolve over space (1-10 km) and time (from hours to days) scales directly influence mixed layer variability and are ubiquitous in the Southern Ocean. Mixed layer eddies contribute to mixed layer restratification, while down-front winds, enhanced by strong synoptic storms, can erode stratification by a cross-frontal Ekman buoyancy flux. This study investigates the role of these submesoscale processes on the subseasonal and interannual variability of the mixed layer stratification using four years of high-resolution glider data in the Southern Ocean. An increase of stratification from winter to summer occurs due to a seasonal warming of the mixed layer. However, we observe transient decreases in stratification lasting from days to weeks, which can arrest the seasonal restratification by up to two months after surface heat flux becomes positive. This leads to interannual differences in the timing of seasonal restratification by up to 36 days. Parameterizing the Ekman buoyancy flux in a one-dimensional mixed layer model reduces the magnitude of stratification compared to when the model is run using heat and freshwater fluxes alone. Importantly, the reduced stratification occurs during the spring restratification period, thereby holding important implications for mixed layer dynamics in climate models as well as physical-biological coupling in the Southern Ocean.
机译：海洋分层和混合层的垂直范围影响海洋和大气交换特性的速率。这个过程对南大洋的人为热量和碳吸收有直接影响。在空间（1-10 km）和时间（从几小时到几天）尺度上演化的亚中尺度不稳定性直接影响混合层的可变性，并且在南大洋无处不在。混合层涡流有助于混合层的再定殖，而强风暴天气增强的前风可通过跨额叶埃克曼浮力通量侵蚀分层。这项研究使用四年的南大洋高分辨率滑翔机数据，调查了这些亚中尺度过程对混合层分层的亚季节和年际变化的作用。由于混合层的季节性变暖，从冬季到夏季分层增加。但是，我们观察到分层的持续下降持续了几天到几周，这可以在表面热通量变为正值后的两个月内阻止季节性重新定律。这导致季节性重新批准的时间年际差异长达36天。与仅使用热通量和淡水通量运行模型相比，在一维混合层模型中对Ekman浮力通量进行参数化可以降低分层的幅度。重要的是，减少的分层发生在春季再定居期间，因此对气候模型中的混合层动力学以及南大洋的生物－生物耦合具有重要意义。

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  • 来源
    《Journal of Physical Oceanography》 |2019年第4期|1035-1053|共19页
  • 作者

    Du Plessis Marcel; Swart Sebastiaan; Ansorge Isabelle J.; Mahadevan Amala; Thompson Andrew F.;

  • 作者单位

    Univ Cape Town, Dept Oceanog, Rondebosch, South Africa|CSIR, Southern Ocean Carbon & Climate Observ, Stellenbosch, South Africa;

    Univ Cape Town, Dept Oceanog, Rondebosch, South Africa|Univ Gothenburg, Dept Marine Sci, Gothenburg, Sweden;

    Univ Cape Town, Dept Oceanog, Rondebosch, South Africa;

    Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA;

    CALTECH, Environm Sci & Engn, Pasadena, CA 91125 USA;

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