气候变化领域集成服务门户(CCPortal): Evolution of an Atmospheric Kármán Vortex Street From High-Resolution Satellite Winds: Guadalupe Island Case Study

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DOI	10.1029/2019JD032121
	Evolution of an Atmospheric Kármán Vortex Street From High-Resolution Satellite Winds: Guadalupe Island Case Study
	Horváth Á.; Bresky W.; Daniels J.; Vogelzang J.; Stoffelen A.; Carr J.L.; Wu D.L.; Seethala C.; Günther T.; Buehler S.A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:4
英文摘要	Vortex streets formed in the stratocumulus-capped wake of mountainous islands are the atmospheric analogues of the classic Kármán vortex street observed in laboratory flows past bluff bodies. The quantitative analysis of these mesoscale unsteady atmospheric flows has been hampered by the lack of satellite wind retrievals of sufficiently high spatial and temporal resolution. Taking advantage of the cutting-edge Advanced Baseline Imager, we derived kilometer-scale cloud-motion winds at 5-min frequency for a vortex street in the lee of Guadalupe Island imaged by Geostationary Operational Environmental Satellite-16. Combined with Moderate Resolution Imaging Spectroradiometer data, the geostationary imagery also provided accurate stereo cloud-top heights. The time series of geostationary winds, supplemented with snapshots of ocean surface winds from the Advanced Scatterometer, allowed us to capture the wake oscillations and measure vortex shedding dynamics. The retrievals revealed a markedly asymmetric vortex decay, with cyclonic eddies having larger peak vorticities than anticyclonic eddies at the same downstream location. Drawing on the vast knowledge accumulated about laboratory bluff body flows, we argue that the asymmetric island wake arises from the combined effects of Earth's rotation and Guadalupe's nonaxisymmetric shape resembling an inclined flat plate at low angle of attack. However, numerical simulations will need to establish whether or not the selective destabilization of the shallow atmospheric anticyclonic eddies is caused by the same mechanisms that destabilize the deep columnar anticyclones of laboratory flows, such as three-dimensional vertical perturbations due to centrifugal or elliptical instabilities. ©2020. The Authors.
英文关键词	ASCAT; cloud-motion winds; GOES-R; Karman; satellite winds; vortex street
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186154
作者单位	Meteorological Institute, Universität Hamburg, Hamburg, Germany; I. M. Systems Group, Rockville, MD, United States; NOAA/NESDIS Center for Satellite Applications and Research, College Park, MD, United States; Royal Netherlands Meteorological Institute (KNMI), de Bilt, Netherlands; Carr Astronautics, Greenbelt, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD, United States; Finnish Meteorological Institute, Kuopio, Finland; Department of Computer Science, ETH Zürich, Zürich, Switzerland
推荐引用方式 GB/T 7714	Horváth Á.,Bresky W.,Daniels J.,et al. Evolution of an Atmospheric Kármán Vortex Street From High-Resolution Satellite Winds: Guadalupe Island Case Study[J],2020,125(4).
APA	Horváth Á..,Bresky W..,Daniels J..,Vogelzang J..,Stoffelen A..,...&Buehler S.A..(2020).Evolution of an Atmospheric Kármán Vortex Street From High-Resolution Satellite Winds: Guadalupe Island Case Study.Journal of Geophysical Research: Atmospheres,125(4).
MLA	Horváth Á.,et al."Evolution of an Atmospheric Kármán Vortex Street From High-Resolution Satellite Winds: Guadalupe Island Case Study".Journal of Geophysical Research: Atmospheres 125.4(2020).