A Deep Eddy in the Antarctic Intermediate Water North of the Chatham Rise
A Deep Eddy in the Antarctic Intermediate Water North of the Chatham Rise
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DOI：
10.1175/1520-0485(1998)028
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发表时间：
1998-03
影响因子：
3.5
通讯作者：
S. Chiswell;P. Sutton
中科院分区：
文献类型：
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作者：
S. Chiswell;P. Sutton
1996年年中，对新西兰附近的查塔姆海隆进行了水文测量。在1200 - 1800 dbar的海隆以北发现了一个孤立的南极中层水深涡。它在32.1的势密度面（s1）上最宽。位温盐度和位温氧特征确定的涡流有一个源南部的查塔姆上升。这个漩涡太深了，不可能越过查塔姆隆起，它到达这个位置的唯一途径是绕过查塔姆隆起的东端。作者假设，入侵可能是由一个类似的机制，提出了地中海涡旋，使涡旋形成的摩擦边界层的分离结束的查塔姆隆起。一旦入侵形成，它最有可能平流到其观察到的位置，500公里的生成区域，在一个更大规模的永久性涡流内发现的北岛（Wairarapa涡）东南部的再循环。
In mid-1996, a hydrographic survey was made over the Chatham Rise, near New Zealand. A deep isolated eddy of Antarctic Intermediate Water was found north of the rise between 1200 and 1800 dbar. It was widest on a potential density surface (s1) of 32.1. Potential-temperature salinity and potential-temperature oxygen characteristics identify the eddy as having a source south of the Chatham Rise. This eddy was too deep to have passed over the Chatham Rise, and the only way it could have reached this position was by flowing around the eastern end of the Chatham Rise. The authors hypothesize that the intrusion may have been generated by a similar mechanism to that proposed for Mediterranean eddies, so that eddies are formed by separation of a frictional boundary layer at the end of the Chatham Rise. Once the intrusion is formed, it was most likely advected to its observed position, 500 km from the generation region, by recirculation within a much largerscale permanent eddy found off the south east of the North Island (the Wairarapa Eddy).