DOI: 10.1002/2016GL069019
论文题名: On sharp vorticity gradients in elongating baroclinic eddies and their stabilization with a solid-body rotation
作者: Sutyrin G.G.
刊名: Geophysical Research Letters
ISSN: 0094-8980
EISSN: 1944-8711
出版年: 2016
卷: 43, 期: 11 起始页码: 5802
结束页码: 5811
语种: 英语
英文关键词: baroclinic eddies
; nonlinear stability
; self-intensification
Scopus关键词: Dynamical systems
; Flow patterns
; Stabilization
; Vorticity
; Anticyclonic eddies
; Baroclinic eddy
; Multiple equilibrium
; Non-linear stabilities
; Potential vorticity
; self-intensification
; Small perturbations
; Vortex stabilization
; Vortex flow
英文摘要: Wide compensated vortices are not able to remain circular in idealized two-layer models unless the ocean depth is assumed to be unrealistically large. Small perturbations on both cyclonic and anticyclonic eddies grow slower if a middle layer with uniform potential vorticity (PV) is added, owing to a weakening of the vertical coupling between the upper and lower layers and a reduction of the PV gradient in the deep layer. Numerical simulations show that the nonlinear development of the most unstable elliptical mode causes self-elongation of the upper vortex core and splitting of the deep PV anomaly into two corotating parts. The emerging tripolar flow pattern in the lower layer results in self-intensification of the fluid rotation in the water column around the vortex center. Further vortex evolution depends on the model parameters and initial conditions, which limits predictability owing to multiple equilibrium attractors existing in the dynamical system. The vortex core strips thin filaments, which roll up into submesoscale vortices to result in substantial mixing at the vortex periphery. Stirring and damping of vorticity by bottom friction are found to be essential for subsequent vortex stabilization. The development of sharp PV gradients leads to nearly solid-body rotation inside the vortex core and formation of transport barriers at the vortex periphery. These processes have important implications for understanding the longevity of real-ocean eddies. ©2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84977126089&doi=10.1002%2f2016GL069019&partnerID=40&md5=8654bf317fa2fd65b973db31e5618fa4
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9943
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Graduate School of Oceanography, University of Rhode Island, Narragansett, RI, United States
Recommended Citation:
Sutyrin G.G.. On sharp vorticity gradients in elongating baroclinic eddies and their stabilization with a solid-body rotation[J]. Geophysical Research Letters,2016-01-01,43(11).