气候变化领域集成服务门户(CCPortal): Four-Dimensional Quantification of Kelvin-Helmholtz Instabilities in the Polar Summer Mesosphere Using Volumetric Radar Imaging

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DOI	10.1029/2019GL086081
	Four-Dimensional Quantification of Kelvin-Helmholtz Instabilities in the Polar Summer Mesosphere Using Volumetric Radar Imaging
	Chau J.L.; Urco J.M.; Avsarkisov V.; Vierinen J.P.; Latteck R.; Hall C.M.; Tsutsumi M.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:1
英文摘要	We present and characterize in time and three spatial dimensions a Kelvin-Helmholtz Instability (KHI) event from polar mesospheric summer echoes (PMSE) observed with the Middle Atmosphere Alomar Radar System. We use a newly developed radar imaging mode, which observed PMSE intensity and line of sight velocity with high temporal and angular resolution. The identified KHI event occurs in a narrow layer of 2.4 km thickness centered at 85 km altitude, is elongated along north-south direction, presents separation between billows of ~ 8 km in the east-west direction, and its billow width is ~ 3 km. The accompanying vertical gradients of the horizontal wind are between 35 and 45 m/s/km and vertical velocities inside the billows are ± 12 m/s. Based on the estimated Richardson (< 0.25), horizontal Froude ( ~ 0.8), and buoyancy Reynolds ( ~ 2.5 × 10 4) numbers, the observed event is a KHI that occurs under weak stratification and generates strong turbulence. © 2019. The Authors.
英文关键词	Ionosphere; Radar; Turbulence; Angular resolution; Kelvin- helmholtz instabilities; Mesospheric summer echoes; PMSE; Stratified turbulence; Strong turbulence; Vertical gradients; Weak stratification; Radar imaging; buoyancy; Doppler radar; four-dimensional modeling; Kelvin-Helmholtz instability; quantitative analysis; radar imagery; Reynolds number; stratification; turbulence
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/170897
作者单位	Leibniz Institute of Atmospheric Physics, University of Rostock, Kühlungsborn, Germany; Department of Physics and Technology, UiT-The Arctic University of Norway, Tromsø, Norway; Tromsø Geophysical Observatory, UiT-The Arctic University of Norway, Tromsø, Norway; National Institute of Polar Research, Tokyo, Japan
推荐引用方式 GB/T 7714	Chau J.L.,Urco J.M.,Avsarkisov V.,et al. Four-Dimensional Quantification of Kelvin-Helmholtz Instabilities in the Polar Summer Mesosphere Using Volumetric Radar Imaging[J],2020,47(1).
APA	Chau J.L..,Urco J.M..,Avsarkisov V..,Vierinen J.P..,Latteck R..,...&Tsutsumi M..(2020).Four-Dimensional Quantification of Kelvin-Helmholtz Instabilities in the Polar Summer Mesosphere Using Volumetric Radar Imaging.Geophysical Research Letters,47(1).
MLA	Chau J.L.,et al."Four-Dimensional Quantification of Kelvin-Helmholtz Instabilities in the Polar Summer Mesosphere Using Volumetric Radar Imaging".Geophysical Research Letters 47.1(2020).