DOI: 10.1029/2017JD028010
Scopus记录号: 2-s2.0-85051068865
论文题名: Effects of Wind Direction on Variations in Friction Velocity With Wind Speed Under Conditions of Strong Onshore Wind
作者: Fang P. ; Zhao B. ; Zeng Z. ; Yu H. ; Lei X. ; Tan J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 14 起始页码: 7340
结束页码: 7353
语种: 英语
英文关键词: air-sea momentum flux exchange
; averaging time interval
; coastal zone
; friction velocity
; landfalling typhoon
; leveling-off or decreasing behavior of friction velocity
英文摘要: The effects of wind direction on variations in friction velocity with wind speed are studied under moderate (≥9 m/s) to strong (≥22 m/s) onshore wind conditions using 20-Hz ultrasonic wind data from a coastal tower at three different heights. The effects of different averaging time intervals of 20, 10, 2, and 1 min on the variations are also investigated. Three typhoons passed by the tower during the 150 hr of observations. Regardless of wind direction, friction velocity increases with increasing wind speed, and linear regression shows that the rate of increase is ~50% less than previously reported. However, a leveling-off or decrease in friction velocity with increasing wind speed is found under strong wind conditions using a bin-averaged method. Wind direction affects the variations in friction velocity with wind speed. Friction velocity increases with increasing wind speed at a similar growth rate to that of previously published results, with a leveling-off or decrease at wind speeds higher than 22 m/s when the wind blows roughly normal to the shoreline. Form drag induced by sea waves with longer wavelengths is suggested to be responsible for the effects of wind direction on the variations in friction velocity with wind speed. An averaging time interval of 1 min yields representative variations in friction velocity with wind speed using the observations described in this study. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113494
Appears in Collections: 气候减缓与适应
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作者单位: Shanghai Typhoon Institute of China Meteorological Administration, Shanghai, China; Shanghai Institute of Meteorological Science, Shanghai, China
Recommended Citation:
Fang P.,Zhao B.,Zeng Z.,et al. Effects of Wind Direction on Variations in Friction Velocity With Wind Speed Under Conditions of Strong Onshore Wind[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(14)