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Circulation and Modification of Warm Deep Water on the Central Amundsen Shelf

机译：阿蒙森中央中部温暖深水的循环与改造

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摘要

The circulation pathways and subsurface cooling and freshening of warm deep water on the central Amundsen Sea shelf are deduced from hydrographic transects and four subsurface moorings. The Amundsen Sea continental shelf is intersected by the Dotson trough (DT), leading from the outer shelf to the deep basins on the inner shelf. During the measurement period, warm deep water was observed to flow southward on the eastern side of DT in approximate geostrophic balance. A northward outflow from the shelf was also observed along the bottom in the western side of DT. Estimates of the flow rate suggest that up to one-third of the inflowing warm deep water leaves the shelf area below the thermocline in this deep outflow. The deep current was 1.2℃ colder and 0.3 psu fresher than the inflow, but still warm, salty, and dense compared to the overlying water mass. The temperature and salinity properties suggest that the cooling and freshening process is induced by subsurface melting of glacial ice, possibly from basal melting of Dotson and Getz ice shelves. New heat budgets are presented, with a southward oceanic heat transport of 3.3 TW on the eastern side of the DT, a northward oceanic heat transport of 0.5-1.6 TW on the western side, and an ocean-to-glacier heat flux of 0.9-2.53 TW, equivalent to melting glacial ice at the rate of 83-237km~3yr~(-1). Recent satellite-based estimates of basal melt rates for the glaciers suggest comparable values for the Getz and Dotson ice shelves.
机译：从水文横断面和四个地下系泊系统推导了阿蒙森中部陆架上暖深水的循环路径以及地下冷却和清新。阿蒙森海陆架与Dotson槽（DT）相交，从外陆架一直延伸到内陆架的深海盆地。在测量期间，观察到温暖的深水在DT的东侧以近似地转的平衡向南流动。沿DT西侧底部也观察到了从架子向北流出的现象。流速估算表明，在这种深部流出物中，多达三分之一的流入的深水离开了热跃层以下的架子区域。深水比流入的水冷了1.2℃，比流入的水冷了0.3 psu，但与上覆的水团相比仍然温暖，咸和稠密。温度和盐度特性表明，冰山表面融化可能是由Dotson和Getz冰架的基础融化引起的。提出了新的热预算，在DT东侧向南的海洋热传输为3.3 TW，在西侧向北的海洋热传输为0.5-1.6 TW，海冰间的热通量为0.9- 2.53 TW，相当于以83-237km〜3yr〜（-1）的速度融化冰河。最近基于卫星的冰川基础融化速率估算值表明，盖茨和多森冰架的数值可比。

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  • 来源
    《Journal of Physical Oceanography》 |2014年第5期|1493-1501|共9页
  • 作者

    H. K. Ha; A. K. Wahlin; T. W. Kim; S. H. Lee; J. H. Lee; H. J. Lee; C. S. Hong; L. Arneborg; G. BjOErk; O. Kalen;

  • 作者单位

    Korea Polar Research Institute, and Department of Oceanography, Inha University, Incheon, South Korea;

    Department of Earth Sciences, University of Gothenburg, PB 460, 405 30 Gothenburg, Sweden;

    Korea Polar Research Institute, Incheon, South Korea;

    Korea Polar Research Institute, Incheon, South Korea;

    Korea Institute of Ocean Science and Technology, Ansan, South Korea;

    Korea Polar Research Institute, Incheon, South Korea;

    Korea Institute of Ocean Science and Technology, Ansan, South Korea;

    Department of Earth Sciences, University of Gothenburg, PB 460, 405 30 Gothenburg, Sweden;

    Department of Earth Sciences, University of Gothenburg, PB 460, 405 30 Gothenburg, Sweden;

    Department of Earth Sciences, University of Gothenburg, PB 460, 405 30 Gothenburg, Sweden;

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