Physical and stable isotopic properties and growth processes of sea ice collected in the southern Sea of Okhotsk
Physical and stable isotopic properties and growth processes of sea ice collected in the southern Sea of Okhotsk
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DOI：
10.1029/1999jc000013
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发表时间：
2000-09
影响因子：
--
通讯作者：
J. Ukita;T. Kawamura;N. Tanaka;T. Toyota;M. Wakatsuchi
中科院分区：
文献类型：
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作者：
J. Ukita;T. Kawamura;N. Tanaka;T. Toyota;M. Wakatsuchi
这项研究根据 1995 年和 1996 年仲冬航行的观测和测量，介绍了鄂霍次克海最南端海冰的物理和稳定同位素特性。结构分析表明冰主要是颗粒状的。薄饼横截面可见碟状核心和楔子，这表明薄饼形成早期曾发生过漂流事件。根据独立的 δ18O 和密度测量，雪占总冰量的比例估计约为 8%。根据这些发现，我们得出结论，该地区海冰的初始增长机制是通过漂流的碎冰循环和雪冰形成。分析还表明，雪冰的形成通过海水的额外冻结导致盐通量增加约 10%。在短（天气）时间尺度内，这意味着雪成为浮力通量的负（盐）源而不是正（清新）源。这些结果表明，在暴风雨条件下，冰块和雪冰的快速形成对该地区的盐和浮力通量具有重要影响。
This study presents physical and stable isotopic properties of sea ice in the southernmost section of the Sea of Okhotsk on the basis of observations and measurements made in 1995 and 1996 midwinter cruises. Structural analysis revealed that ice was predominantly of the granular type. Saucer-shaped cores and wedges were seen in the cross sections of the pancakes, which indicate a rafting event in the early stage of the pancake formation. The fraction of snow with respect to the total ice mass was estimated at ∼8% from independent δ18O and density measurements. From these findings we conclude that the initial growth mechanisms of the sea ice over this region are by the frazil pancake cycle with rafting and by the snow ice formation. Analysis also shows that the formation of the snow ice induces ∼10% more salt flux through the additional freezing of the seawater. In a short (synoptic) timescale this implies that snow becomes a negative (salting) rather than a positive (freshening) source for the buoyancy flux. These results suggest critical influence of the rapid formation of the frazil pancakes and snow ice under stormy conditions on the salt and buoyancy fluxes over the region.