NDLI: The research on boundary layer evolution characteristics of Typhoon Usagi based on observations by wind profilers

Content Provider	Springer Nature Link
Author	Liao, Fei Deng, Hua Gao, Zhiqiu Chan, Pak wai
Copyright Year	2017
Abstract	Vertically exploring the characteristics of the typhoon boundary layer (TBL) plays an important role in recognizing typhoon structure. The boundary layer radial direction and tangential wind characteristics of Typhoon Usagi based on the observational data of three boundary layer wind profiler stations along the route of Typhoon Usagi (No. 1319) and by combining with sounding data. The results show that: (1) maximum tangential wind appears in the vicinity of the eye area of Usagi, and it basically maintains a height of around 1 800 m when Usagi keeps a strong typhoon level, with the rapidly decreasing strength of Usagi after it lands, the speed of the maximum tangential wind and its vertical range both decrease; (2) the height of the maximum tangential wind is close to that of the inflow layer top of the typhoon, and is greater than that of the boundary layer estimated on the basis of Richardson number or potential temperature gradient, while the height of mixed layer judged on the basis of the signal-to-noise ratio (SNR) or its gradient is usually low; (3) the the boundary layer height can reach higher than 2 100 m before Usagi lands. When the typhoon level or above is achieved, the boundary layer height observed by various stations does not change much, basically staying at between 1 200 and 1 600 m. With the decreasing strength of Usagi after its landfall, the boundary layer height rapidly drops.
Starting Page	39
Ending Page	44
Page Count	6
File Format	PDF
ISSN	0253505X
Journal	Acta Oceanologica Sinica
Volume Number	36
Issue Number	9
e-ISSN	18691099
Language	English
Publisher	The Chinese Society of Oceanography
Publisher Date	2017-09-02
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	typhoon boundary layer height wind profiler sounding Oceanography Climatology Ecology Engineering Fluid Dynamics Marine & Freshwater Sciences Environmental Chemistry
Content Type	Text
Resource Type	Article
Subject	Aquatic Science Oceanography

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