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首页> 外文期刊>Journal of Glaciology >Signatures of supercooling: McMurdo Sound platelet ice
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Signatures of supercooling: McMurdo Sound platelet ice

机译：过冷的特征：McMurdo Sound血小板冰

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Near ice shelves around Antarctica the ocean becomes supercooled and has been observed to carry small suspended ice crystals. Our measurements demonstrate that these small crystals are persistently present in the water column beneath the winter fast ice, and when incorporated in sea ice they reduce the mean grain size of the sea-ice cover. By midwinter, larger ice crystals below the ice/water interface are observed to form a porous sub-ice platelet layer with an ice volume fraction of 0.25 ± 0.06. The magnitude and direction of the oceanic heat flux varied between (5 ± 6) W m~(-2) (upwards) and (-15 ± 10) W m~(-2) (downwards) in May, but by September it settled between (-6 ± 2) and (-11 ± 2) W m~(-2). The negative values imply that the ocean acts as a heat sink which is responsible for the growth of 12% of the ice thickness between June and September. This oceanic contribution should not be ignored in models of Antarctic sea-ice thickness close to an ice shelf.
机译：在南极洲周围的冰架附近，海洋变得过冷，并被观察到携带小的悬浮冰晶。我们的测量结果表明，这些小晶体持续存在于冬季坚冰下方的水柱中，当掺入海冰时，它们会减小海冰覆盖层的平均粒径。到了冬季，观察到冰/水界面下方的较大冰晶形成了冰体积分数为0.25±0.06的多孔子冰片层。 5月海洋热通量的大小和方向在（5±6）W m〜（-2）（向上）和（-15±10）W m〜（-2）（向下）之间变化，但到9月稳定在（-6±2）和（-11±2）W m〜（-2）之间。负值表示海洋是一个散热器，在6月至9月期间，冰的厚度增加了12％。在接近冰架的南极海冰厚度模型中，不应忽略这种海洋贡献。

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