An Improved Ekman Layer Approximation for Smooth Eddy Diffusivity Profiles

被引：0
|
作者：
Oskar Parmhed
Igor Kos
Branko Grisogono
机构：
[1] Stockholm University,Department of Meteorology
[2] Croatia Control Ltd.,Aeronautical Meteorological Division
[3] Swedish Defense Research Agency FOI,Department of Geophysics, Faculty of Science
[4] Zagreb University,undefined
来源：
Boundary-Layer Meteorology | 2005年 / 115卷
关键词：
Boundary-layer pumping; Lambert’s W; WKB;
D O I：
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学科分类号：
摘要：
The Ekman boundary-layer model is extended analytically for a gradually varying eddy diffusivity K(z) ≥ 0, z ≥ 0. A solution for the Ekman layer is provided having similar structure to the constant-K case; that is, exponentially decaying sine functions for the two horizontal wind components. The analytical asymptotic solution compares well with its numerical counterpart for various K(z). The result can be useful in theoretical studies such as Ekman pumping, for efficient estimation of the Ekman layer profiles in various analyses with near-neutral stratifications, or for a rapid initialization of mesoscale models.
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页码：399 / 407
页数：8
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