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首页> 外文期刊>Journal of Physical Oceanography >On the Role of Coastal Troughs in the Circulation of Warm Circumpolar Deep Water on Antarctic Shelves
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On the Role of Coastal Troughs in the Circulation of Warm Circumpolar Deep Water on Antarctic Shelves

机译：沿海海槽在南极大陆架上高温圆极深水循环中的作用

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Oceanic exchanges across the continental shelves of Antarctica play an important role in biological systems and the mass balance of ice sheets. The focus of this study is on the mechanisms responsible for the circulation of warm Circumpolar Deep Water (CDW) within troughs running perpendicular to the continental shelf. This is examined using process-oriented numerical experiments with an eddy-resolving (1 km) 3D ocean model that includes a static and thermodynamically active ice shelf. Three mechanisms that create a significant onshore flow within the trough are identified: 1) a deep onshore flow driven by the melt of the ice shelf, 2) interaction between the longshore mean flow and the trough, and 3) interaction between a Rossby wave along the shelf break and the trough. In each case the onshore flow is sufficient to maintain the warm temperatures underneath the ice shelf and basal melt rates of O(l m yr~(-1)). The third mechanism in particular reproduces several features revealed by moorings from Marguerite Trough (Bellingshausen Sea): the temperature maximum at middepth, a stronger intrusion on the downstream edge of the trough, and the appearance of warm anticyclonic anomalies every week. Sensitivity experiments highlight the need to properly resolve the small baroclinic radii of these regions (5 km on the shelf)-simulations at 3-km resolution cannot reproduce mechanism 3 and the associated heat transport.
机译：跨南极洲大陆架的海洋交换在生物系统和冰盖的质量平衡中起着重要作用。这项研究的重点是在垂直于大陆架的海槽内引起暖圆极深水（CDW）循环的机制。这是通过面向过程的数值实验进行的，该实验采用涡旋分辨（1公里）3D海洋模型，该模型包括一个静态且热力学活跃的冰架。确定了在槽内产生明显的陆上流动的三种机制：1）由冰架融化驱动的深陆上流动； 2）长岸平均流与波谷之间的相互作用； 3）Rossby波沿波之间的相互作用架子破裂和低谷。在每种情况下，陆上流量足以维持冰架下方的温暖温度和基础融化速率O（l m yr〜（-1））。第三种机理尤其重现了玛格丽特海槽（贝灵斯豪森海）的系泊所揭示的几个特征：中深处的最高温度，海槽下游边缘的侵入性更强以及每周出现温暖的反气旋异常。敏感性实验表明，需要正确解决这些区域的小斜斜半径（在架子上5 km），以3 km的分辨率模拟无法再现机理3和相关的热传输。

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