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首页> 外文会议>16th International Conference on Port and Ocean Engineering Under Arctic Conditions Vol.1 Aug 12-17, 2001 Ottawa, Ontario, Canada >HYPERSALINE PERMAFROST UNDER A LAGOON OF THE ARCTIC OCEAN
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HYPERSALINE PERMAFROST UNDER A LAGOON OF THE ARCTIC OCEAN

机译：北极泻湖下的超高温永久冻土

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A series of borings was drilled and sampled in the winter on a transect across a 1 to 2 m deep lagoon on the Alaskan Coast of the Arctic Ocean. Subsurface temperatures were measured, and all of the temperatures were below freezing, with soils under the lagoon colder than those under the deeper offshore water. Pore water salinities were measured and show a hypersaline condition of 2 to 4 times the salinity found in seawater. Much of the lagoon freezes to its full depth by the end of the winter. In the shallower waters, the seasonal freezing penetrates into the underlying soil. Salt exclusion from the bottom of the ice cover continues down into the soil with the deepening freezing front. However, when the materials thaw each summer the process is not reversed by the slower diffusion process, so the pore water salinity increases year by year. The hypersalinity results in the chemical degradation of the interstitial ice. Visual ice and ice bonding were not observed where hypersalinity depresses the freezing point below the ground temperature.
机译：冬季，在北冰洋阿拉斯加海岸一个横跨1至2 m深泻湖的样带上钻出一系列钻孔并进行采样。测量了地下温度，所有温度都低于冰点，泻湖下的土壤比深海下的土壤更冷。测量的孔隙水盐度显示高盐度是海水中盐度的2至4倍。到冬季结束时，大部分泻湖会冻结到最大深度。在较浅的水域中，季节性冻结现象渗透到下面的土壤中。随着冰冻前沿的加深，从冰盖底部排除的盐继续向下进入土壤。但是，当材料在每个夏季融化时，扩散过程就不会因较慢的扩散过程而逆转，因此孔隙水的盐度逐年增加。高盐度导致间隙冰的化学降解。在高盐度将冰点降低到低于地面温度的地方，未观察到可见的冰和冰结。

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