The Effect of Small-Scale Vertical Mixing of Horizontal Momentum in a General Circulation Model
The Effect of Small-Scale Vertical Mixing of Horizontal Momentum in a General Circulation Model
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一般循环模型中水平动量小规模垂直混合的影响
DOI：
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发表时间：
1974
期刊：
影响因子：
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通讯作者：
R. Somerville
中科院分区：
文献类型：
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作者：
P. Stone;W. Quirk;R. Somerville
本文介绍了改变GISS全球环流模式中亚网格尺度垂直涡粘性的几个试验。结果表明，大粘度抑制了中高纬的大尺度涡旋，但增强了热带Hadley环流，增加了热带东风的范围。与观测值的比较表明，对于中高纬度地区，涡度粘性系数∼为1m2/S或更小，而对于低纬度地区，涡度粘性系数∼为100m2/S。积云对流是导致低纬地区小尺度混合增加的一个合理机制。
Abstract Several experiments are described in which the sub-grid-scale vertical eddy viscosity in the GISS global general circulation model was varied. The results show that large viscosities suppress large-scale eddies in middle and high latitudes, but enhance the circulation in the tropical Hadley cell and increase the extent of the tropical easterlies. Comparison with observations shows that the GISS model requires eddy viscosities ∼1 m2/s or less to give realistic results for middle and high latitudes, and eddy viscosities ∼100 m2/s to give realistic results for low latitudes. A plausible mechanism for the implied increase in small-scale mixing in low latitudes is cumulus convection.