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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >An Arctic Ocean cold core eddy
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An Arctic Ocean cold core eddy

机译：北冰洋冷核涡

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Detailed physical and chemical observations were obtained during September 1997 of a cold core eddy situated in the southern central Canada Basin of the Arctic Ocean. The eddy was about 20 km in diameter, had maximum current speeds exceeding 20 cm s(-1), and extended from the base of the upper mixed layer, near 40 m, down to similar to 400 m. Excess salt in the eddy core was consistent with addition of brine from similar to 1 m of ice formation. Core tracer distributions indicated a lifetime exceeding 1 year and were consistent with an origin as near-surface Pacific water with some admired terrestrial runoff. The eddy was probably formed in association with a polynya along the Alaskan Chukchi Sea coast through local water densification from surface ice formation followed by development of frontal instabilities. Formation and subsequent migration of such eddies, which may have lifetimes of several years, provide a mechanism for transporting water from the Beaufort and Chukchi Sea coastal and shelf regions into the interior Canada Basin and for contributing to maintenance of the permanent halocline. Present light ice conditions throughout the Arctic Ocean favor the formation of such eddies and may contribute to enhanced ventilation of the halocline waters. [References: 42]
机译：1997年9月，在北冰洋加拿大中部南部盆地的一个冷芯涡获得了详细的物理和化学观测结果。涡旋直径约20 km，最大电流速度超过20 cm s（-1），并从上混合层的底部延伸至40 m附近，直至接近400 m。涡流岩心中的盐分过多与添加了大约1 m的冰层形成的盐水一致。岩心示踪剂的分布表明其寿命超过一年，并且与近地表太平洋水和一些令人敬佩的地表径流相一致。涡流可能是与阿拉斯加楚科奇海沿岸的一个波利尼亚河共同形成的，其原因是表面冰层形成了局部水致密化作用，然后形成了前缘不稳定性。这种涡流的形成和随后的迁移（可能具有数年的使用寿命），提供了一种将水从博福特和楚科奇海沿岸和陆架区运入加拿大内部盆地的机制，并有助于维持永久性盐环。整个北冰洋目前的轻冰条件有利于这种涡流的形成，并可能有助于增强卤水的通风。 [参考：42]

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