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DOI10.1029/2020GL090703
Vertical eddy diffusivity parameterization based on a large eddy simulation and its impact on prediction of hurricane landfall
Xin Li; Zhaoxia Pu
2020-12-06
发表期刊Geophysical Research Letters
出版年2020
英文摘要

The vertical eddy diffusivity (VED) in the planetary boundary layer (PBL) affects tropical cyclones’ structure and evolution. Uncertainties of VED in the PBL parametrization scheme of a mesoscale model could be caused by the model's inability to represent large eddies(LEs). Using a large‐eddy simulation (LES) of Hurricane Harvey (2017) as a benchmark, the YSU PBL scheme is improved by adding effects of LEs derived from the LES. It is found that LEs’ maximum intensity is linearly significantly related to the square of mean horizontal divergence below 400 m of height at the same air column with a slope coefficient of 1.97. The revised YSU scheme relates the VED of momentum (Km) to the square root of LEs’ intensity with a slope coefficient of 0.08 in PBL and 0.20 in a free atmosphere. Compared to the original scheme, the modified YSU scheme leads to improved forecasts of landfalling hurricanes.

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领域气候变化
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文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/305782
专题气候变化
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GB/T 7714
Xin Li,Zhaoxia Pu. Vertical eddy diffusivity parameterization based on a large eddy simulation and its impact on prediction of hurricane landfall[J]. Geophysical Research Letters,2020.
APA Xin Li,&Zhaoxia Pu.(2020).Vertical eddy diffusivity parameterization based on a large eddy simulation and its impact on prediction of hurricane landfall.Geophysical Research Letters.
MLA Xin Li,et al."Vertical eddy diffusivity parameterization based on a large eddy simulation and its impact on prediction of hurricane landfall".Geophysical Research Letters (2020).
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