GSTDTAP  > 地球科学
DOI10.5194/acp-17-3507-2017
Impact of vertical wind shear on roll structure in idealized hurricane boundary layers
Wang, Shouping; Jiang, Qingfang
2017-03-14
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2017
卷号17期号:5
文章类型Article
语种英语
国家USA
英文摘要

Quasi-two-dimensional roll vortices are frequently observed in hurricane boundary layers. It is believed that this highly coherent structure, likely caused by the inflection-point instability, plays an important role in organizing turbulent transport. Large-eddy simulations are conducted to investigate the impact of wind shear characteristics, such as the shear strength and inflection-point level, on the roll structure in terms of its spectral characteristics and turbulence organization. A mean wind nudging approach is used in the simulations to maintain the specified mean wind shear without directly affecting turbulent motions. Enhancing the radial wind shear expands the roll horizontal scale and strengthens the roll's kinetic energy. Increasing the inflection-point level tends to produce a narrow and sharp peak in the power spectrum at the wavelength consistent with the roll spacing indicated by the instantaneous turbulent fields. The spectral tangential momentum flux, in particular, reaches a strong peak value at the roll wavelength. In contrast, the spectral radial momentum flux obtains its maximum at the wavelength that is usually shorter than the roll's, suggesting that the roll radial momentum transport is less efficient than the tangential because of the quasi-two-dimensionality of the roll structure. The most robust rolls are produced in a simulation with the highest inflection-point level and relatively strong radial wind shear. Based on the spectral analysis, the roll-scale contribution to the turbulent momentum flux can reach 40% in the middle of the boundary layer.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000397827900002
WOS关键词LARGE-EDDY SIMULATION ; INFLECTION POINT INSTABILITY ; TROPICAL CYCLONES ; VORTICES ; MODEL ; FLOW ; ENTRAINMENT ; CONVECTION
WOS类目Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/30509
专题地球科学
作者单位Naval Res Lab, Monterey, CA 93943 USA
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Wang, Shouping,Jiang, Qingfang. Impact of vertical wind shear on roll structure in idealized hurricane boundary layers[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(5).
APA Wang, Shouping,&Jiang, Qingfang.(2017).Impact of vertical wind shear on roll structure in idealized hurricane boundary layers.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(5).
MLA Wang, Shouping,et al."Impact of vertical wind shear on roll structure in idealized hurricane boundary layers".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.5(2017).
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