The heat flux and the temperature gradient in the lower atmosphere

The heat flux and the temperature gradient in the lower atmosphere
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低层大气中的热通量和温度梯度

DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
C. Meneveau
C. Meneveau
中科院分区:
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文献类型:
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作者:
C. Higgins;M. Parlange;C. Meneveau

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大气边界层大涡模拟中使用的大多数参数化都是基于亚网格尺度通量与输送量的空间梯度对齐的假设(下梯度闭合)。基于现场实验,我们确定了亚网格尺度(SGS)热通量相对于基于温度梯度的参数化的分布和最可能的相对方向。我们发现,在中性和不稳定的大气稳定度,SGS热通量最有可能位于所谓的混合张量涡动扩散率模型的几何跨度。
Most parameterizations used in Large Eddy Simulations of the atmospheric boundary layer are based on the assumption that subgrid‐scale fluxes are aligned against spatial gradients of transported quantities (down‐gradient closures). Based on field experiments, we determine the distribution and most probable relative orientations of the subgrid‐scale (SGS) heat flux relative to parameterizations based on the temperature gradient. We show that, under neutral and unstable atmospheric stability, the SGS heat flux most likely lies within the geometric span of the so called mixed tensor eddy diffusivity model.