气候变化领域集成服务门户(CCPortal): Direct Observations of Near-Inertial Wave ζ-Refraction in a Dipole Vortex

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DOI	10.1029/2020GL090375
	Direct Observations of Near-Inertial Wave ζ-Refraction in a Dipole Vortex
	Thomas L.N.; Rainville L.; Asselin O.; Young W.R.; Girton J.; Whalen C.B.; Centurioni L.; Hormann V.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:21
英文摘要	Generated at large horizontal scales by winds, near-inertial waves (NIWs) are inefficient at radiating energy without a shift to smaller wavelengths. The lateral scales of NIWs can be reduced by gradients in the Coriolis parameter (β-refraction) or in the vertical vorticity (ζ-refraction) or by strain. Here we present ship-based surveys of NIWs in a dipole vortex in the Iceland Basin that show, for the first time, direct evidence of ζ-refraction. Differences in NIW phase across the dipole were observed to grow in time, generating a lateral wavelength that shrank at a rate consistent with ζ-refraction, reaching ∼40 km in 1.5 days. Two days later, a NIW beam with an ∼13 km horizontal and ∼200 m vertical wavelength was detected at depth radiating energy downward and toward the dipole's anticyclone. Strain, while significant in strength in the dipole, had little direct effect on the NIWs. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Vortex flow; Coriolis parameter; Direct observations; Iceland Basin; Lateral scale; Near-inertial waves; Vertical vorticity; Refraction; anticyclone; inertia; irradiation; vortex flow; vorticity; wave propagation; wavelength; wind velocity; Atlantic Ocean; Iceland Basin
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/169522
作者单位	Department of Earth System Science, Stanford University, Stanford, CA, United States; Applied Physics Laboratory, University of Washington, Seattle, WA, United States; Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States; Lagrangian Drifter Laboratory, Scripps Institution of Oceanography, University of California San Diego, La Jolla, CA, United States
推荐引用方式 GB/T 7714	Thomas L.N.,Rainville L.,Asselin O.,et al. Direct Observations of Near-Inertial Wave ζ-Refraction in a Dipole Vortex[J],2020,47(21).
APA	Thomas L.N..,Rainville L..,Asselin O..,Young W.R..,Girton J..,...&Hormann V..(2020).Direct Observations of Near-Inertial Wave ζ-Refraction in a Dipole Vortex.Geophysical Research Letters,47(21).
MLA	Thomas L.N.,et al."Direct Observations of Near-Inertial Wave ζ-Refraction in a Dipole Vortex".Geophysical Research Letters 47.21(2020).