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Boundary-Layer Meteorology

, Volume 171, Issue 2, pp 237–255 | Cite as

Lidar Observations of the Typhoon Boundary Layer Within the Outer Rainbands

  • Yuan-Shiang TsaiEmail author
  • Jiun-Jih Miau
  • Chao-Ming Yu
  • Wan-Ting Chang
Research Article
  • 69 Downloads

Abstract

The typhoon boundary layer within the two super typhoons Dujuan and Soudelor is observed using ground-based Doppler lidar up to a height of 240 m, and primarily in the outer rain-bands. The mean wind-speed profiles are analyzed over 1-h intervals and two longer intervals, representing the stages of the typhoons’ approach and departure, respectively. In agreement with surface-layer parametrizations related to finite mixing-length theory, the hourly mean wind-speed profiles demonstrate that the scaling parameter \(u_{*o}\)/fc, where \(u_{*o}\) denotes the surface friction velocity, and fc denotes the Coriolis parameter, determines the depth the surface layer, and governs the boundary-layer formation in the mixed layer. With large values of \(u_{*o}\)/fc, the dominance of surface friction extends the logarithmic layer to the uppermost level of the present observations. In contrast, with small \(u_{*o}\)/fc values, the effect of the Coriolis parameter increases the wind speed with respect to the logarithmic profile above the surface layer. That the averaged wind-speed profiles may be described by finite mixing-length theory, the empirical Deaves and Harris model, as well as the power-law profile, suggest these approaches are appropriate for simulations of the typhoon boundary layer.

Keywords

Lidar measurement Mixing-length theory Surface layer Typhoon boundary layer Wind-speed profiles 

Notes

Acknowledgements

The authors wish to express their acknowledgement to the Ministry of Science and Technology for project funding (MOST 105-3113-E-006-016-CC2 and MOST 107-3113-F006-002). We are also indebted to the Central Weather Bureau and Water Resources Agency in Taiwan for use of the buoy and meteorological data.

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.National Centre for Research on Earthquake EngineeringNational Applied Research LaboratoriesTaipeiTaiwan
  2. 2.Department of Aeronautics and AstronauticsNational Cheng Kung UniversityTainanTaiwan
  3. 3.Taiwan Ocean Research InstituteNational Applied Research LaboratoriesKaohsiungTaiwan

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