Direct observations of the Antarctic circumpolar current transport on the northern flank of the Kerguelen Plateau
Direct observations of the Antarctic circumpolar current transport on the northern flank of the Kerguelen Plateau
复制标题
DOI：
10.1002/jgrc.20067
复制
发表时间：
2013-03
影响因子：
--
通讯作者：
G. Damerell;K. Heywood;D. Stevens
中科院分区：
文献类型：
--
作者：
G. Damerell;K. Heywood;D. Stevens
[1]在2008年11月至12月的南大洋精细结构巡航期间，对凯尔盖朗高原北方侧翼发现的南极绕极流中的长期弯曲进行了调查。卫星测高的18年地表地转流时间序列表明，在这次调查中观察到的弯曲是该地区的典型。水文站位于东经65-75°和南纬43-48°之间的大陆架上（约200米深），并向凯尔盖朗以北的深海倾斜（约4 700米），提供了迄今为止对该地区最详细的调查。地转切变参考降低的声学多普勒海流剖面仪速度，以给出该区域总体积运输的第一次估计，运输预算在调查框周围闭合。副热带锋、亚季风锋和极锋的北方分支共同向东输送174 ± 22 Sv。虽然174 Sv与典型的德雷克海峡输送量相比是很大的，但它与其他估计的总输送量以及额外的15 Sv的印度尼西亚季风流量相一致。斜压输送参考站对之间的最深共同水平是119西弗，与其他斜压输送在这方面的估计。在这个经度上，ACC的锋面非常靠近。我们讨论前线的财产交换。
[1] The standing meander in the Antarctic Circumpolar Current (ACC) found on the northern flank of the Kerguelen Plateau was investigated during the Southern Ocean Finestructure cruise in November–December 2008. An 18 year time series of surface geostrophic currents from satellite altimetry shows that the meander as observed during this survey is typical of the region. Hydrographic stations were occupied between 65–75°E and 43–48°S on the shelf (~200 m depth) and slope into the deep ocean to the north of Kerguelen (~4700 m), providing the most detailed survey of this region to date. Geostrophic shears are referenced to lowered acoustic Doppler current profiler velocities to give the first estimate of the total volume transport in this region, and the transport budget is closed around the survey box. The Subtropical Front, Subantarctic Front, and a northern branch of the Polar Front together have an associated transport of 174 ± 22 Sv eastward. While 174 Sv is large compared with typical Drake Passage transports, it is reconciled with other estimates of the total transport with the additional 15 Sv of the Indonesian Throughflow. Baroclinic transport referenced to the deepest common level between station pairs is 119 Sv, consistent with other estimates of the baroclinic transport in this area. At this longitude, the fronts of the ACC are exceptionally close together. We discuss the exchange of properties across the fronts.