Model of world ocean circulation: II. Thermally driven, two-layer
Model of world ocean circulation: II. Thermally driven, two-layer
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世界海洋环流模型：II．
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通讯作者：
G. Veronis
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作者：
G. Veronis
海洋运动在一定程度上是由与热带和极地之间表层水的不同加热有关的热力驱动的。在这项研究中，通过假设流体通过界面的上升流，在双层系统中对热驱动进行了参数化。在有上层水存在的地方，上升流是稳定的，水平上是均匀的。在假定界面沿东部边界深度不变的情况下，导出了海洋内部的上、下层输运和界面分布。然后，质量守恒产生了西边界流和海岸界面深度的传输。上层流体的汇对应于极地地区的热冷却，由于后者的分布和强度不是很准确，因此得出了不同分布和大小的汇的结果。因此，人们探索了各种可能性。特别是对西部边界流与海岸分离的条件进行了推导。分析表明，除非事先指定汇点，否则问题的解不是唯一的。然而，这些替代方案是信息量很大的，应该有助于解释由风应力和热力驱动的更一般模型的结果。
Oceanic motions are partly driven by thermal forces associated with differential heating of the surface waters between tropical and polar regions. In this study thermal driving is parameterized in a two-layer system by an assumed upwelling of fluid through the interface. The up-welling is steady and horizontally uniform wherever upper-layer water is present. With an assumed constant depth of the interface along the eastern boundary the transports of the upper and lower layers and the interface distribution are derived for the interior ocean. Mass conservation then yields the transports of the western boundary current and the interface depth along the coast. Sinks of upper-layer fluid correspond to thermal cooling in polar regions and, since the distribution and intensity of the latter process is not known very accurately, results are derived for different distributions and magnitudes of the sinks. Hence, various possibilities are explored. In particular, conditions under which separation of the western boundary current from the coast is possible are derived. The analysis shows that the solution to the problem is not unique unless the sinks are specified a priori. Nevertheless, the alternatives are informative and should help to interpret the results of the more general model driven by wind stress and thermal forces.