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DOI | 10.1029/2020GL090703 |
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
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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. This article is protected by copyright. All rights reserved. |
领域 | 气候变化 |
URL | 查看原文 |
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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 |
推荐引用方式 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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