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关于稳定大气边界层中标量梯度锐化的一则注释。

A Note on Scalar-Gradient Sharpening in the Stable Atmospheric Boundary Layer.

作者信息

van Hooft J Antoon

机构信息

Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, The Netherlands.

出版信息

Boundary Layer Meteorol. 2020;176(1):149-156. doi: 10.1007/s10546-020-00516-x. Epub 2020 Apr 10.

DOI:10.1007/s10546-020-00516-x
PMID:32508348
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7242271/
Abstract

The scalar front generated by the horizontal self advection of a dipolar vortex through a modest scalar gradient is investigated. This physical scenario is an idealization of the emergence of strong temperature ramps in the stable atmospheric boundary layer. The proposed mechanism is discussed and a two-dimensional analogy is studied in depth using direct numerical simulation. More specifically, the scalar-gradient sharpening is investigated as a function of the Reynolds number. It appears that the process of gradient sharpening at large-eddy scales may be challenging for turbulence-resolving methods applied to the stable-boundary-layer regime.

摘要

研究了偶极涡通过适度标量梯度的水平自平流产生的标量锋。这种物理情景是稳定大气边界层中强温度梯度出现的一种理想化情况。讨论了所提出的机制，并使用直接数值模拟深入研究了二维类比。更具体地说，研究了标量梯度锐化作为雷诺数的函数。结果表明，对于应用于稳定边界层区域的湍流解析方法而言，大涡尺度下的梯度锐化过程可能具有挑战性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e373/7242271/818c4f3f2abc/10546_2020_516_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e373/7242271/4099151adaa6/10546_2020_516_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e373/7242271/eb032849a90d/10546_2020_516_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e373/7242271/5a1b1c39af73/10546_2020_516_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e373/7242271/818c4f3f2abc/10546_2020_516_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e373/7242271/4099151adaa6/10546_2020_516_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e373/7242271/eb032849a90d/10546_2020_516_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e373/7242271/5a1b1c39af73/10546_2020_516_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/e373/7242271/818c4f3f2abc/10546_2020_516_Fig4_HTML.jpg

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本文引用的文献

1
Towards Adaptive Grids for Atmospheric Boundary-Layer Simulations.迈向用于大气边界层模拟的自适应网格
Boundary Layer Meteorol. 2018;167(3):421-443. doi: 10.1007/s10546-018-0335-9. Epub 2018 Feb 14.