DOI: 10.1002/2015MS000457
Scopus记录号: 2-s2.0-84945445634
论文题名: The azimuthally averaged boundary layer structure of a numerically simulated major hurricane
作者: Abarca S ; F ; , Montgomery M ; T ; , McWilliams J ; C
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2015
卷: 7, 期: 3 起始页码: 1207
结束页码: 1219
语种: 英语
英文关键词: Advection
; Hurricane effects
; Hurricanes
; Numerical models
; Boundary layer structure
; Horizontal velocity
; Hurricane boundary layers
; Secondary eyewalls
; Shock-like structures
; Surface friction
; Tangential velocities
; Vertical advection
; Boundary layers
; advection
; azimuth
; boundary layer
; Ekman layer
; hurricane
; numerical model
; surface flux
; wind velocity
英文摘要: This work examines the azimuthally averaged boundary layer structure of a numerically simulated hurricane. We nominally define the hurricane boundary layer as the layer in which the effects of surface friction are associated with significant departures from gradient wind balance. The boundary layer in the intensifying primary and forming secondary eyewalls is found to be nonlinear. At large radii, exterior to the eyewalls, Ekman-like balance as traditionally defined, is found to hold true. Where significant departures from Ekman-like balance are found, the departures are characterized by large vertical advection of horizontal velocity through the depth of the boundary layer. Shock-like structures are not found to be prominent in the azimuthally averaged view of the vortex boundary layer, with the largest azimuthally averaged radial gradients of the radial and tangential velocities being on the order of only a few meters per second per kilometer. Also, in the radial regions of the eyewalls, at the height where the averaged tangential wind is a maximum, the radial advection of radial velocity is an order of magnitude smaller than the agradient force per unit mass. Some physical implications of these findings are discussed. © 2015. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75975
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: IMSG at NOAA/NWS/NCEP, College Park, MD, United States; Naval Postgraduate School, Monterey, CA, United States; Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA, United States
Recommended Citation:
Abarca S,F,, Montgomery M,et al. The azimuthally averaged boundary layer structure of a numerically simulated major hurricane[J]. Journal of Advances in Modeling Earth Systems,2015-01-01,7(3)