气候变化领域集成服务门户(CCPortal): Polygonal Eyewall Asymmetries During the Rapid Intensification of Hurricane Michael (2018)

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DOI	10.1029/2020GL087919
	Polygonal Eyewall Asymmetries During the Rapid Intensification of Hurricane Michael (2018)
	Cha T.-Y.; Bell M.M.; Lee W.-C.; DesRosiers A.J.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:15
英文摘要	Polygonal eyewall asymmetries of Hurricane Michael (2018) during rapid intensification (RI) are analyzed from ground-based single Doppler radar. Here, we present the first observational evidence of the evolving wind field of a polygonal eyewall during RI to Category 5 intensity by deducing the axisymmetric and asymmetric winds at 5-min intervals. Spectral time decomposition of the retrieved tangential wind structure shows quantitative evidence of low (1–4) azimuthal wavenumbers with propagation speeds that are consistent with linear wave theory on a radial vorticity gradient, suggesting the presence of rapidly evolving vortex Rossby waves. Dual-Doppler winds from the NOAA P-3 Hurricane Hunter airborne radar provide further evidence of the three-dimensional vortex structure that supports growth of asymmetries during RI. Both reflectivity and tangential wind fields show polygonal structure and propagate at similar speeds, suggesting a close coupling of the dynamics and the convective organization during the intensification. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	Doppler radar; Hurricanes; Mechanical waves; Azimuthal wavenumbers; Linear wave theory; Polygonal structures; Rapid intensification; Time decompositions; Vortex rossby waves; Vortex structures; Vorticity gradients; Vortex flow; decomposition analysis; Doppler radar; hurricane; NOAA satellite; reflectivity; Rossby wave; vortex flow; wind field; wind forcing
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170062
作者单位	Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Cha T.-Y.,Bell M.M.,Lee W.-C.,et al. Polygonal Eyewall Asymmetries During the Rapid Intensification of Hurricane Michael (2018)[J],2020,47(15).
APA	Cha T.-Y.,Bell M.M.,Lee W.-C.,&DesRosiers A.J..(2020).Polygonal Eyewall Asymmetries During the Rapid Intensification of Hurricane Michael (2018).Geophysical Research Letters,47(15).
MLA	Cha T.-Y.,et al."Polygonal Eyewall Asymmetries During the Rapid Intensification of Hurricane Michael (2018)".Geophysical Research Letters 47.15(2020).