Antarctic Circumpolar Current frontal system in the South Atlantic: Monitoring using merged Argo and animal-borne sensor data
Antarctic Circumpolar Current frontal system in the South Atlantic: Monitoring using merged Argo and animal-borne sensor data
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DOI：
10.1029/2007jc004647
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发表时间：
2008-09-05
影响因子：
3.6
通讯作者：
Fedak, M.
中科院分区：
文献类型：
--
作者：
Boehme, L.;Meredith, M. P.;Fedak, M.
我们描述了大规模的南极绕极流（ACC）在南大洋的大西洋部分合并Argo数据和新的动物携带的CTD传感器获得的数据的功能。其中21个CTD-卫星中继数据记录器（CTD-SRDL）连接到南格鲁吉亚的南象海豹（Mirounga leonina）。合并后的数据产生统一的网格水文场具有高的时间和空间分辨率，使每个数据集分别确定的功能。将该资料所揭示的锋面场的结构和变率与每日四分之一度、最佳内插的海面温度场和每周网格化的海平面距平场进行了比较。一般来说，使用我们的数据集得到的锋面位置与以前的工作是一致的，特别是在路径受到地形，e。例如，在一个实施例中，位于北斯科舍岭和南斯科舍岭。然而，随着CTD-SRDLs提供的时间和空间分辨率的提高，我们能够观察到一些新的功能。所有锋面位置的变化比以前所示的整个斯科舍海和大西洋中脊以西的季节性时间尺度。合并后的数据集显示的时间变化的南ACC锋（SACF）北南格鲁吉亚，并在其位置以东的岛屿，在那里的SACF位于进一步北比已建议在以前的工作。此外，与以前的工作相比，亚南极洲锋向北穿越大西洋中脊约400公里。
We describe large-scale features of the Antarctic Circumpolar Current (ACC) in the Atlantic part of the Southern Ocean by merging Argo data and data obtained by novel animal-borne CTD sensors. Twenty one of these CTD-Satellite Relay Data Loggers (CTD-SRDLs) were attached to Southern elephant seals (Mirounga leonina) on South Georgia. The merged data yield unified gridded hydrogaphic fields with high temporal and spatial resolution, enabling the determination of features absent in each of the data sets separately. The structure and variability of the frontal field revealed by this data set were compared with those in daily quarter-degree, optimally interpolated sea surface temperature fields and fields of weekly gridded sea level anomaly. In general, the frontal positions derived using our data set are in agreement with previous work, especially where the pathways are constrained by topography, e. g., at the North Scotia Ridge and the South Scotia Ridge. However, with the improved temporal and spacial resolution provided by the CTD-SRDLs, we were able to observe some novel features. All frontal positions are more variable than previously indicated across the Scotia Sea and west of the Mid-Atlantic Ridge on seasonal time scales. The merged data set shows the temporal variability of the Southern ACC Front (SACCF) north of South Georgia and in its position east of the island, where the SACCF lies further north than has been suggested in previous work. In addition, the Subantarctic Front crosses the Mid-Atlantic Ridge about 400 km further north when compared to previous work.