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Investigation of turbulent momentum flux in the typhoon boundary layer
Author(s) -
Duan Ziqiang,
Yao Xiaohong,
Li Yongping,
Lei Xiaotu,
Fang Pingzhi,
Zhao Bingke
Publication year - 2017
Publication title -
journal of geophysical research: oceans
Language(s) - English
Resource type - Journals
eISSN - 2169-9291
pISSN - 2169-9275
DOI - 10.1002/2016jc012169
Subject(s) - typhoon , anemometer , boundary layer , eddy covariance , flux (metallurgy) , turbulence , atmospheric sciences , meteorology , momentum (technical analysis) , planetary boundary layer , boundary layer thickness , turbulence kinetic energy , physics , mechanics , chemistry , ecology , organic chemistry , economics , finance , ecosystem , biology
Turbulent momentum flux in the typhoon boundary layer was measured at a turbulent flux tower in Southeast China using an eddy covariance technique during the passage of typhoons Fanapi and Megi in 2010. The anemometers were mounted on the cantilever bracket at the height of 26.6, 42.4, 60.4, and 82.9 m. The momentum flux in the typhoon boundary layer decreased with increasing height during the two typhoon passages. The decrease was nearly linear during the passage of the Typhoon Fanapi. However, in the boundary layer of the Typhoon Megi, the momentum flux at 26.6 m height was much greater than that at 42.4 m height. The cospectra of wind components showed that the enhanced flux at the bottom of the boundary layer was caused by small‐scale turbulence with frequency in the range of 0.1–1 Hz and can be explained by the turbulent energy accumulation of small‐scale turbulence.