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Impact of Atmospheric Forcing on Antarctic Continental Shelf Water Masses

机译：大气强迫对南极大陆架水团的影响

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摘要

The Antarctic continental shelf seas feature a bimodal distribution of water mass temperature, with the Amundsen and Bellingshausen Seas flooded by Circumpolar Deep Water that is several degrees Celsius warmer than the cold shelf waters prevalent in the Weddell and Ross Seas. This bimodal distribution could be caused by differences in atmospheric forcing, ocean dynamics, ocean and ice feedbacks, or some combination of these factors. In this study, a highly simplified coupled sea ice-mixed layer model is developed to investigate the physical processes controlling this situation. Under regional atmospheric forcings and parameter choices the 10-yr simulations demonstrate a complete destratification of the Weddell Sea water column in winter, forming cold, relatively saline shelf waters, while the Amundsen Sea winter mixed layer remains shallower, allowing a layer of deep warm water to persist. Applying the Weddell atmospheric forcing to the Amundsen Sea model destratifies the water column after two years, and applying the Amundsen forcing to the Weddell Sea model results in a shallower steady-state winter mixed layer that no longer destratifies the water column. This suggests that the regional difference in atmospheric forcings alone is sufficient to account for the bimodal distribution in Antarctic shelf-sea temperatures. The model prediction of mixed layer depth is most sensitive to the air temperature forcing, but a switch in all forcings is required to prevent destratification of the Weddell Sea water column.
机译：南极大陆架海的水质温度呈双峰分布，Amundsen和Bellingshausen海被环极深水淹没，其温度比Weddell和Ross海中普遍的冷架水高几摄氏度。这种双峰分布可能是由于大气强迫，海洋动力学，海洋和冰层反馈的差异或这些因素的某种组合引起的。在这项研究中，开发了高度简化的耦合海冰混合层模型，以研究控制这种情况的物理过程。在区域性大气强迫和参数选择的条件下，十年的模拟表明，冬季的韦德尔海水柱完全分层，形成了冷的，相对盐渍的架子水，而阿蒙森海冬季的混合层仍然较浅，从而形成了深温水层。坚持下去。将Weddell大气强迫应用于Amundsen Sea模型将在两年后对水柱进行分层，将Amundsen强迫应用于Weddell Sea模型将导致较浅的稳态冬季混合层，而不再使水柱分层。这表明仅大气强迫的区域差异就足以说明南极大陆架海温的双峰分布。混合层深度的模型预测对气温强迫最敏感，但是需要在所有强迫上进行切换以防止韦德尔海水柱分层。

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  • 来源
    《Journal of Physical Oceanography》 |2013年第5期|920-940|共21页
  • 作者

    Alek A. Petty; Daniel L. Feltham; Paul R. Holland;

  • 作者单位

    Centre for Polar Observation and Modelling, Department of Earth Sciences, University College London, London, United Kingdom;

    Centre for Polar Observation and Modelling, Department of Meteorology, University of Reading, Reading, United Kingdom;

    British Antarctic Survey, Cambridge, United Kingdom;

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