Wintertime Water Mass Modification near an Antarctic Ice Front
Wintertime Water Mass Modification near an Antarctic Ice Front
复制标题
DOI：
10.1175/jpo-d-12-0186.1
复制
发表时间：
2013-02-01
影响因子：
3.5
通讯作者：
Boehme, Lars
中科院分区：
文献类型：
--
作者：
Arthun, Marius;Nicholls, Keith W.;Boehme, Lars
在冰下测量由海豹携带一个微型电导率温度深度（CTD）仪器填补了现有观测的一个重要空白。在这里，作者提出的数据，从仪表威德尔密封，花了连续8个月（2月至9月）觅食在靠近菲尔希纳冰架，从而提供详细的信息，混合层水文在南部的秋季和冬季的演变。由此产生的水文时间序列显示出强烈的季节性水团修改，占主导地位的上层海洋（0-300米）的盐度增加0.31，对应于3.1米的海冰增长，和500米厚的冬季混合层的发展。此外，观测结果还突出表明，在大陆架上向南缓慢流动（3-5厘米秒（-1））的盐度逐渐增加，并表明推断的冰产量最好被视为区域平均值，而不是纯粹的地方。没有明显的季节性观察到的属性的基础冰架水。
Under ice measurements by seals carrying a miniaturized conductivity-temperature-depth (CTD) instrument fill an important gap in existing observations. Here the authors present data from an instrumented Weddell seal that spent eight consecutive months (February-September) foraging in close proximity to the Filchner Ice Shelf, thus providing detailed information about the evolution of mixed layer hydrography during the austral autumn and winter. The resultant time series of hydrography shows strong seasonal water mass modification, dominated by an upper-ocean (0-300 m) salinity increase of 0.31, corresponding to 3.1 m sea ice growth, and the development of a 500-m thick winter mixed layer. Observations furthermore highlight a gradual salinity increase in a slow (3-5 cm s(-1)) southward flow on the continental shelf, toward the site, and suggest that the inferred ice production is better considered as a regional average rather than being purely local. No clear seasonality is observed in the properties of the underlying Ice Shelf Water.