摘要
通过建立包含线性洋底地形、牛顿冷却和Ｒａｙｌｅｉｇｈ摩擦的逆向约化重力线性大洋深层环流模型，采用摄动方法研究热带海区的侧边界底地形在位涡平衡方程中的动力效应。结果发现，坡度微弱的地形（α＝０（ε））对涡管的作用可以忽略，此时平底近似是可取的；在坡度较陡峭的情况下，地形将对西边界流产生显著的影响。特别要指出的是，地形与牛顿冷却在对涡管进行强迫时具有一定的等效性。
An inverted one and a half layer reduced gravity linear shallow water model with a linear varying bottom topography is formulated, in which a uniform middepth upwelling is prescribed. By using the perturbation method, the mechanism of topographic effect on the deep circulation in the vorticity equilibrium equations is studied. In the case of a gentle slope (α=0(ε)) , the topographic effect on the vortex is too weak to deserve consideration and the flat bottom approximation is feasible. While in the steeper case (α=0(1)) , the topography affects the circulation prominently in both the western boundary layer and the interior. It is also worthwhile to note that topography plays the same role as Newtonian Cooling in forcing on the vortex.
基金
国家自然科学基金
国家海洋局科技发展基金
关键词
地形
牛顿冷却
约化重力
赤道区
深层环流
topography
Newtonian Cooling
reduced gravity
western boundary current
