Exchange of Laptev Sea and Arctic Ocean halocline waters in response to atmospheric forcing
Exchange of Laptev Sea and Arctic Ocean halocline waters in response to atmospheric forcing
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DOI：
10.1029/2008jc005062
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发表时间：
2009-05-08
影响因子：
3.6
通讯作者：
Kassens, H.
中科院分区：
文献类型：
--
作者：
Bauch, D.;Dmitrenko, I. A.;Kassens, H.
相结合的三角洲O-18/盐度数据揭示了一个独特的水团在冬季海冰形成过程中产生的主要是在南部拉普捷夫海的沿海冰间湖地区。富盐水底层水的输出显示出与大气条件相关的年际变化。夏季反气旋环流有利于地表河水的离岸运输，以及在陆架坡折处约50 m水深处富含盐水的沃茨的明显信号。夏季气旋大气环流有利于陆上或向东，沿岸水运输，并在货架打破河流的水部分减少和明显的盐水信号是失踪，而在中间的拉普捷夫海货架，盐水丰富的沃茨被发现在高比例。因此，大陆架上底层和次表层沃茨水的停留时间可能会有很大差异：在“岸上”气旋大气环流期间，大陆架沃茨水向北冰洋盐跃层的输出可能会被关闭或大幅减少，而在“离岸”反气旋大气环流的情况下，盐水沃茨水被输出，停留时间可能只有1年。
Combined delta O-18/salinity data reveal a distinctive water mass generated during winter sea ice formation which is found predominantly in the coastal polynya region of the southern Laptev Sea. Export of the brine-enriched bottom water shows interannual variability in correlation with atmospheric conditions. Summer anticyclonic circulation is favoring an offshore transport of river water at the surface as well as a pronounced signal of brine-enriched waters at about 50 m water depth at the shelf break. Summer cyclonic atmospheric circulation favors onshore or an eastward, alongshore water transport, and at the shelf break the river water fraction is reduced and the pronounced brine signal is missing, while on the middle Laptev Sea shelf, brine-enriched waters are found in high proportions. Residence times of bottom and subsurface waters on the shelf may thereby vary considerably: an export of shelf waters to the Arctic Ocean halocline might be shut down or strongly reduced during "onshore'' cyclonic atmospheric circulation, while with "offshore'' anticyclonic atmospheric circulation, brine waters are exported and residence times may be as short as 1 year only.