The intensity of the net meridional circulation
The intensity of the net meridional circulation
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DOI：
10.1002/qj.49707632808
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发表时间：
1950-04
影响因子：
8.9
通讯作者：
H. Riehl;T. Yeh;R. Sutcliffe
中科院分区：
文献类型：
--
作者：
H. Riehl;T. Yeh;R. Sutcliffe
总环流的定性描述指出，在每个半球有三个经向环流细胞。根据这些描述，风和中纬度西风带的分界线大约在30度左右，那里的地面气压高。据说，从副热带高压脊向北和向南的摩擦外流，加上下降。再往极地，极锋的平均纬度作为极地和中纬度单元格的分界线。在这里，气流从南北方向汇聚并上升。本文的目的是确定这些经向细胞的循环强度，并估计它们在维持大气的热量和角动量平衡方面的有效性。这不能通过基于压力分布（地转风）的计算来完成，而只能使用合成风矢量。Riehl（1950）以前计算了纬25”n和纬25”S之间的地面净经向流分量。这份说明涵盖了纬45”n到纬45”S之间的区域。
Qualitative descriptions of the general circulation point out that there are three meridional circulation cells in each hemisphere. According to these descriptions, the boundary between the trades and middle-latitude westerlies lies roughly near 30" where surface pressure is high. Frictional outflow northward and southward is said to take place from the subtropical ridge, coupled with descent. Farther poleward, the average latitude of the polar front serves as the dividing mark between polar and middle-latitude cells. Here, air currents converge from both north and south and ascend.It is the object of this paper to determine the intensity of circulation of these meridional cells and to estimate how effective they are in maintaining the heat and angular momentum balance of the atmosphere. This cannot be done with computations based on the pressure distribution (geostrophic wind) but only with use of resultant wind vectors. Riehl (1950) previously calculated the net meridional flow component at the surface between latitudes 25" N. and S. This note covzrs the area from 45" N. to 45" S.