Four-Dimensional Quantification of Kelvin-Helmholtz Instabilities in the Polar Summer Mesosphere Using Volumetric Radar Imaging

doi:10.1029/2019GL086081

GSTDTAP > 气候变化

DOI	10.1029/2019GL086081
	Four-Dimensional Quantification of Kelvin-Helmholtz Instabilities in the Polar Summer Mesosphere Using Volumetric Radar Imaging
	Chau, J. L.1; Urco, J. M.1; Avsarkisov, V 2; Vierinen, J. P.2; Latteck, R.1; Hall, C. M.3; Tsutsumi, M.4
	2020-01-16
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2020
卷号	47 期号:1
文章类型	Article
语种	英语
国家	Germany; Norway; Japan
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 similar to 8 km in the east-west direction, and its billow width is similar to 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 (similar to 0.8), and buoyancy Reynolds (similar to 2.5 x 10(4)) numbers, the observed event is a KHI that occurs under weak stratification and generates strong turbulence.
领域	气候变化
收录类别	SCI-E
WOS记录号	WOS:000513983400012
WOS关键词	TURBULENCE ; ECHOES ; DYNAMICS ; SHEAR ; ATMOSPHERE ; JICAMARCA ; STABILITY ; MIDDLE ; LAYERS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
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/279528
专题	气候变化
作者单位	1.Univ Rostock, Leibniz Inst Atmospher Phys, Kuhlungsborn, Germany; 2.UiT Arctic Univ Norway, Dept Phys & Tec Nol, Tromso, Norway; 3.UiT Arctic Univ Norway, Tromso Geophys Observ, Tromso, Norway; 4.Natl Inst Polar Res, 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]. GEOPHYSICAL RESEARCH LETTERS,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).