Isopycnal Momentum Budget of the Antarctic Circumpolar Current in the Fine Resolution Antarctic Model
Isopycnal Momentum Budget of the Antarctic Circumpolar Current in the Fine Resolution Antarctic Model
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高分辨率南极模型中南极绕极流的等重动量收支
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
M. Nanneh
中科院分区：
文献类型：
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作者：
P. Killworth;M. Nanneh
摘要利用精细分辨率南极模式（FRAM）的数据，以密度为纵坐标，分析了南极环极流（ACC）的动量收支，因为密度在流线上近似守恒。这个稳定的预算是平衡的。体积、热量和盐的预算也在密度层内计算，尽管这些仍然依赖于时间。每一起伏密度层的上下表面形式阻力的前阶动量平衡近似相等，但由于密度层在地表露头，这并不意味着地表风应力仅通过形式阻力向下传递而不改变振幅。将注意力限制在某一层的净形态上，这被发现是由科里奥利力平衡的，如果这一层露出来，风的压力就会施加到它露出来的那一层上。在任何纬度的密度层中，有40%到60%的密度层在地表的某个地方露头，因此风应力可以移动到…
Abstract The momentum budget of the Antarctic Circumpolar Current (ACC) is analyzed using data from the Fine Resolution Antarctic Model (FRAM), using density as a vertical coordinate, since density is approximately conserved on streamlines. This steady budget is balanced. Volume, heat, and salt budgets are also computed within density layers, although these remain time dependent. The leading-order momentum balance is of approximate equality of the form drag on the top and bottom surfaces of each undulating density layer, but because density layers outcrop at the surface, this does not imply that the surface wind stress is simply transferred downward by form drag without change of amplitude. Restricting attention to the net form drag on a layer, this is found to be balanced by Coriolis force and, if the layer outcrops, the amount of wind stress put into the layer where it outcrops. Between 40% and 60% of the density layers at any latitude outcrop somewhere at the surface, so that wind stress can be moved d...