Highly variable upper and abyssal overturning cells in the South Atlantic
Highly variable upper and abyssal overturning cells in the South Atlantic
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DOI：
10.1126/sciadv.aba7573
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发表时间：
2020-08-01
期刊：
影响因子：
13.6
通讯作者：
Garzoli, S. L.
中科院分区：
文献类型：
--
作者：
Kersale, M.;Meinen, C. S.;Garzoli, S. L.
经向翻转环流（MOC）是驱动地球上海洋热量重新分配的主要机制，从而影响地球的气候和天气。然而，人们对 MOC 的全深度结构和变异性仍然知之甚少，特别是在南大西洋。这项研究基于南大西洋南纬 34.5 度的每日停泊测量，提供了上部（类似于 3100 米）翻转单元的海洋体积输送的独特多年记录。时间平均流量的垂直结构与有限的历史观测结果一致。上层细胞和深海细胞在时间尺度上都表现出相对于时间平均值的高度变异性，范围从几天到几周。观察到的深海流的变化似乎很大程度上独立于上层细胞的流。在两个单元格中均未检测到有意义的趋势。
The Meridional Overturning Circulation (MOC) is a primary mechanism driving oceanic heat redistribution on Earth, thereby affecting Earth's climate and weather. However, the full-depth structure and variability of the MOC are still poorly understood, particularly in the South Atlantic. This study presents unique multiyear records of the oceanic volume transport of both the upper (similar to 3100 meters) overturning cells based on daily moored measurements in the South Atlantic at 34.5 degrees S. The vertical structure of the time-mean flows is consistent with the limited historical observations. Both the upper and abyssal cells exhibit a high degree of variability relative to the temporal means at time scales, ranging from a few days to a few weeks. Observed variations in the abyssal flow appear to be largely independent of the flow in the overlying upper cell. No meaningful trends are detected in either cell.