Notes and correspondence - The low-level katabatic jet height versus Monin-Obukhov height
Notes and correspondence - The low-level katabatic jet height versus Monin-Obukhov height
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DOI：
10.1002/qj.190
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发表时间：
2007-10-01
影响因子：
8.9
通讯作者：
Jericevic, A.
中科院分区：
文献类型：
--
作者：
Grisogono, B.;Kraljevic, L.;Jericevic, A.
在这个简短的说明中，我们讨论了一个长期存在的问题，在模拟复杂地形的大气边界层（ABL）：即，过度使用的Monin-Obukhov长度尺度L-MO。随着数值天气预报和气候模式分辨率的不断提高，这个问题变得越来越相关，这些模式通常以某种方式使用L-MO来参数化近地面层，或者至少用于制定下边界条件。因此，不可避免地，模式的下代表了显着的一部分，中尺度流动的variation.We在这里集中在稳定的ABL在陆地上：特别是，倾斜的冷却流。然而，定性类似的推理适用于相应的不稳定ABL。我们表明，充分分层流在适度倾斜的表面，莫宁-奥布霍夫尺度是不足以描述基本ABL动态，这往往是由下降流和排水流量。版权所有（c）2007皇家气象学会。
In this short note we discuss a long-standing problem in modelling the atmospheric boundary layer (ABL) over complex terrain: namely, an excessive use of the Monin-Obukhov length scale L-MO. This issue becomes increasingly relevant with the ever-increasing resolution of numerical weather-prediction and climate models, which typically use L-MO in one way or another for parametrizing the surface layer, or at least for formulating the lower boundary conditions. Hence, inevitably, the models under-represent a significant part of the mesoscale flow variability.We focus here on the stable ABL over land: in particular, sloped cooled flows. However, a qualitatively similar reasoning applies to the corresponding unstable ABL. We show that for sufficiently stratified flows over moderately sloped surfaces, Monin-Obukhov scaling is inadequate for describing the basic ABL dynamics, which is often governed by katabatic and drainage flows. Copyright (c) 2007 Royal Meteorological Society.