气候变化领域集成服务门户(CCPortal): Vertical Eddy Diffusivity Parameterization Based on a Large-Eddy Simulation and Its Impact on Prediction of Hurricane Landfall

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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
	Li X.; Pu Z.
发表日期	2021
ISSN	0094-8276
卷号	48 期号:2
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. © 2020. University of Utah.
英文关键词	Boundary layers; Hurricane effects; Storms; Hurricane landfall; Improved forecast; Maximum intensities; Meso-scale modeling; Parametrizations; Planetary boundary layers; Tropical cyclone; Vertical eddy diffusivity; Large eddy simulation
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169218
作者单位	Department of Atmospheric Sciences, University of Utah, Salt Lake City, UT, United States
推荐引用方式 GB/T 7714	Li X.,Pu Z.. Vertical Eddy Diffusivity Parameterization Based on a Large-Eddy Simulation and Its Impact on Prediction of Hurricane Landfall[J],2021,48(2).
APA	Li X.,&Pu Z..(2021).Vertical Eddy Diffusivity Parameterization Based on a Large-Eddy Simulation and Its Impact on Prediction of Hurricane Landfall.Geophysical Research Letters,48(2).
MLA	Li X.,et al."Vertical Eddy Diffusivity Parameterization Based on a Large-Eddy Simulation and Its Impact on Prediction of Hurricane Landfall".Geophysical Research Letters 48.2(2021).