The thermodynamic balance of the Weddell Gyre
The thermodynamic balance of the Weddell Gyre
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DOI：
10.1002/2015gl066658
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发表时间：
2016-01-16
影响因子：
5.2
通讯作者：
Bacon, Sheldon
中科院分区：
文献类型：
--
作者：
Garabato, Alberto C. Naveira;Zika, Jan D.;Bacon, Sheldon
韦德尔环流的热力学平衡评估从逆估计环流的边缘。环流经历了一个弱的净浮力增益，产生于两个相反的贡献之间的领先的订单取消，连接到两个细胞的水团改造和diapycnal翻转。较低的细胞涉及冷却驱动的致密化8.42.0西弗的绕极深水和南极底层水附近的环流的南部和西部边缘。上层单元需要在环流内部将4.92.0 Sv的环极深水转换为较轻的上层海洋沃茨。这两个细胞之间的盐度的不同作用源于相反的盐度变化引起的海冰生产，大气来源，和混合物的新鲜上层海洋沃茨在较低的细胞，这与连贯的减少与海冰融化和大气来源在上层细胞的盐度。
The thermodynamic balance of the Weddell Gyre is assessed from an inverse estimate of the circulation across the gyre's rim. The gyre experiences a weak net buoyancy gain that arises from a leading-order cancelation between two opposing contributions, linked to two cells of water mass transformation and diapycnal overturning. The lower cell involves a cooling-driven densification of 8.42.0Sv of Circumpolar Deep Water and Antarctic Bottom Water near the gyre's southern and western margins. The upper cell entails a freshening-driven conversion of 4.92.0Sv of Circumpolar Deep Water into lighter upper ocean waters within the gyre interior. The distinct role of salinity between the two cells stems from opposing salinity changes induced by sea ice production, meteoric sources, and admixture of fresh upper ocean waters in the lower cell, which contrasts with coherent reductions in salinity associated with sea ice melting and meteoric sources in the upper cell.