Observing global ocean topostrophy
Observing global ocean topostrophy
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DOI：
10.1029/2007jc004635
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发表时间：
2008-07-31
影响因子：
3.6
通讯作者：
Holloway, Greg
中科院分区：
文献类型：
--
作者：
Holloway, Greg
[1]最近的出版物已经评估了地形，τ f X V中心点del D，其中f是科里奥利，V是速度，rD是总深度的梯度，作为比较模式环流的一种手段。一些结果是惊人的。Merryfield和Scott（2007年）比较了四个全球模型，其中两个网格大小适中，两个网格较细，结果表明，网格较细的模型具有更大的正t值，特别是在深度较大和纬度较高的地区。在九个北冰洋模式中，霍洛威等人（2007年）发现其中三个模式的t与其他六个模式的t非常不同，这一结果表明取决于次网格涡动参数化。Penduff等人（2007）从同一模型中不同数值方法的选择表明，改进的数值表示支持更积极的t。这些模型的结果可以与观测结果进行比较吗？全球汇编已准备从17120电流计记录，跨越83087电流计月。汇编倾向于通过更精细的分辨率、改进的参数化和更好的表示来确认建模进展。一个新的全球海洋环流的特点出现，具有启发性的动力学见解。
[1] Recent publications have evaluated topostrophy, tau f X V center dot del D where is f Coriolis, V is velocity, and rD is gradient of total depth, as a means of comparing models' circulations. Some results are striking. Comparing four global models, two with modest grid size and two with fine grids, Merryfield and Scott (2007) show that finer grid models are characterized by more positive t, especially at greater depths and higher latitudes. Among nine Arctic Ocean models, Holloway et al. (2007) find t in three of the models quite distinct from the other six, a result shown to depend upon subgrid eddy parameterization. From different choices of numerical method within the same model, Penduff et al. (2007) show that improved numerical representations support more positive t. Can these model results be compared with observations? A global compilation has been prepared from 17120 current meter records, spanning 83087 current meter- months. The compilation tends to confirm modeling progress achieved by finer resolution, improved parameterizations and better representations. A new characterization of global ocean circulation emerges, with suggestive dynamical insights.