Spurious diapycnal mixing of the deep waters in an eddy-permitting global ocean model
Spurious diapycnal mixing of the deep waters in an eddy-permitting global ocean model
复制标题
允许涡流的全球海洋模型中深水的虚假双密度混合
DOI：
10.1175/1520-0485(2002)032
复制
发表时间：
2002
影响因子：
3.5
通讯作者：
A. Nurser
中科院分区：
文献类型：
--
作者：
Mei;A. Coward;A. Nurser
最近的理想化研究表明，在高分辨率z坐标模式中，与平流方案相关的显式水平扩散和隐式扩散都可能导致不切实际的高水平混合率。这里的目的是观察在全球允许涡流的（¼°×¼°）z水平模式中，与平流方案相关的平流混合是否足够强，以破坏热盐环流。本文利用水质量变换的思想对河床通量进行了诊断。在南大洋，模式深海和底水迅速远离莱维图斯气候学，密集的等平线以高达35米/年的速度向下移动。由于地表通量差和没有冰模式，不能用不正确的地表强迫来解释通过密集等平线的强向上通量（高达50 Sv），因为大多数异常的底平通量发生在远离地表强迫的深海中。因此，过度的…
Abstract Recent idealized studies have shown that both explicit horizontal diffusion and the implicit diffusion associated with the advection scheme in high-resolution z-coordinate models may drive unrealistically high rates of diapycnal mixing. The aim here is to see whether the diapycnal mixing associated with the advection scheme in a global eddy-permitting (¼° by ¼°) z-level model is sufficiently strong to corrupt the thermohaline circulation. This paper diagnoses the diapycnal fluxes by using the ideas of water mass transformation. In the Southern Ocean, the model deep and bottom waters drift rapidly away from the Levitus climatology, with dense isopycnals moving downward at rates of up to 35 m yr−1. The strong upward flux (up to 50 Sv) through the dense isopycnals cannot be explained by the incorrect surface forcing (as a result of poor surface fluxes and no ice model) as most of the anomalous diapycnal fluxes are occurring in the deep ocean far from surface forcing. Hence, the excessive diapycnal f...