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A Zonal Pathway for NADW in the South Atlantic

机译：南大西洋NADW的区域性途径

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Several large deployments of neutrally buoyant floats took place within the Antarctic Intermediate (AAIW), North Atlantic Deep Water (NADW), and the Antarctic Bottom Water (AABW) of the South Atlantic in the 1990s and a number of hydrographic sections were occupied as well. Here we use the spatially and temporally averaged velocities measured by these floats, combined with the hydrographic section data and various estimates of regional current transports from moored current meter arrays, to determine the circulation of the three major subthermocline water masses in a zonal strip across the South Atlantic between the latitudes of 19°S and 30°S. We concentrate on this region because the historical literature suggests that it is where the Deep Western Boundary Current containing NADW bifurcates. In support of this notion, we find that a net of about 5 Sv. of the 15–20 Sv that crosses 19°S does continue zonally eastward at least as far as the Mid-Atlantic Ridge. Once across the ridge it takes a circuit to the north along the ridge flanks before returning to the south in the eastern half of the Angola Basin. The data suggest that the NADW then continues on into the Indian Ocean. This scheme is discussed in the context of distributions of dissolved oxygen, silicate and salinity. In spite of the many float-years of data that were collected in the region a surprising result is that their impact on the computed solutions is quite modest. Although the focus is on the NADW we also discuss the circulation for the AAIW and AABW layers.
机译：1990年代，在南极中级（AAIW），北大西洋深水（NADW）和南大西洋的南极底水（AABW）内进行了几次大型的中性浮力部署，并且还占用了许多水文剖面。在这里，我们使用由这些浮标测得的时空平均速度，结合水文断面数据和来自系泊电流表阵列的各种区域电流传输的估计，来确定整个带状地带中三个主要亚热线水团的环流。南大西洋介于19°S和30°S之间。我们专注于该区域，因为历史文献表明，该区域是包含NADW的“深西部边界流”分叉的地方。为了支持该观点，我们发现净值约为5 Sv。跨越19°S的15-20 Sv的确确实向东向纬度延伸，至少一直延伸到中大西洋海岭。穿过山脊后，沿着山脊侧面向北绕行，然后返回安哥拉盆地东半部的南部。数据表明，NADW随后继续进入印度洋。在溶解氧，硅酸盐和盐度分布的背景下讨论了该方案。尽管在该地区收集了许多浮动年份的数据，但令人惊讶的结果是，它们对计算解决方案的影响相当小。尽管重点是NADW，但我们也讨论了AAIW和AABW层的循环。

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