气候变化领域集成服务门户(CCPortal): A discussion on influences of turbulent diffusivity and surface drag parameterizations using a linear model of the tropical cyclone boundary layer wind field

CCPortal

DOI	10.1016/j.atmosres.2020.104847
	A discussion on influences of turbulent diffusivity and surface drag parameterizations using a linear model of the tropical cyclone boundary layer wind field
	Li W.; Hu Z.; Pei Z.; Li S.; Chan P.W.
发表日期	2020
ISSN	0169-8095
卷号	237
英文摘要	In order to investigate and predict dynamics and developments of the tropical cyclone boundary layer (TCBL), theoretical and engineering models depicting the TCBL wind field are of great academic and practical interest. In the present study, a linear height-resolving model, where the vertically varying turbulent diffusivity (K) and speed dependent surface drag coefficient (Cd) parameterizations are incorporated, is proposed based on the original model proposed by Kepert (2001). The proposed model is validated through comparisons with the estimates made based on the observational data gathered by dropsondes. As the more realistic and sophisticated parameterizations are integrated, the proposed model produces predictions in better agreements with observations in the lower part of the TCBL. It is noted that the value of the proposed model is not only the improvements over the original model by Kepert (2001), but also the room for more sophisticated K and Cd parameterizations. With the help of the proposed model, it is feasible to discern the fundamental relationships between K and Cd parameterizations and the TCBL wind field in a parametric study. As the first step, a few K and Cd parameterizations are implemented in the proposed model, and their influences on the prediction of the TCBL wind field are systematically discussed. It is concluded that, whereas the prediction of the TCBL wind field is sensitive to the parameterization of K, Cd has limited effects on the prediction. Moreover, assuming K and Cd as constants could lead to erroneous estimates of the wind profile and strength of surface winds in the TCBL. © 2020 Elsevier B.V.
英文关键词	Surface drag coefficient; Theoretical model; Turbulent diffusivity; Typhoon
学科领域	Boundary layer flow; Boundary layers; Diffusion; Drag; Drag coefficient; Forecasting; Hurricanes; Parameterization; Storms; Tropics; Engineering models; Linear modeling; Observational data; Original model; Parametric study; Theoretical modeling; Tropical cyclone; Turbulent diffusivities; Atmospheric thermodynamics; atmospheric modeling; boundary layer; drag coefficient; parameterization; turbulent diffusion; typhoon; wind field
语种	英语
scopus关键词	Boundary layer flow; Boundary layers; Diffusion; Drag; Drag coefficient; Forecasting; Hurricanes; Parameterization; Storms; Tropics; Engineering models; Linear modeling; Observational data; Original model; Parametric study; Theoretical modeling; Tropical cyclone; Turbulent diffusivities; Atmospheric thermodynamics; atmospheric modeling; boundary layer; drag coefficient; parameterization; turbulent diffusion; typhoon; wind field
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/120449
作者单位	Powerchina Huadong Engineering Corporation Limited, Hangzhou, Zhejiang 311122, China; Shenzhen International Graduate School, Tsinghua University, Shenzhen, Guangdong 518055, China; Department of Civil Engineering, Tsinghua University, Beijing, 100084, China; Pengcheng Laboratory, Shenzhen, China; Hong Kong Observatory, 134A Nathan Road, Kowloon, Hong Kong
推荐引用方式 GB/T 7714	Li W.,Hu Z.,Pei Z.,et al. A discussion on influences of turbulent diffusivity and surface drag parameterizations using a linear model of the tropical cyclone boundary layer wind field[J],2020,237.
APA	Li W.,Hu Z.,Pei Z.,Li S.,&Chan P.W..(2020).A discussion on influences of turbulent diffusivity and surface drag parameterizations using a linear model of the tropical cyclone boundary layer wind field.Atmospheric Research,237.
MLA	Li W.,et al."A discussion on influences of turbulent diffusivity and surface drag parameterizations using a linear model of the tropical cyclone boundary layer wind field".Atmospheric Research 237(2020).