DOI: 10.1002/2015GL063731
论文题名: Topographic vorticity generation, submesoscale instability and vortex street formation in the Gulf Stream
作者: Gula J. ; Molemaker M.J. ; McWilliams J.C.
刊名: Geophysical Research Letters
ISSN: 0094-9563
EISSN: 1944-9294
出版年: 2015
卷: 42, 期: 10 起始页码: 4054
结束页码: 4062
语种: 英语
英文关键词: boundary potential vorticity
; Gulf Stream
; shear instability
; submesoscale vortices
; topographic vorticity generation
Scopus关键词: Boundary layers
; Drag
; Ocean currents
; Shear flow
; Stability
; Vorticity
; Boundary potentials
; Cross-shelf exchange
; Gulf Stream
; Large vertical displacement
; Realistic simulation
; Shear instability
; Turbulent bottom boundary layers
; Vorticity generation
; Vortex flow
; continental slope
; displacement
; instability
; meander
; mesoscale meteorology
; topographic effect
; turbulent boundary layer
; vortex
; vorticity
; Atlantic Ocean
; Gulf Stream
; South Atlantic Bight
; Straits of Florida
英文摘要: Meanders and eddies are routinely observed in the Gulf Stream along the South Atlantic Bight. We analyze here the instability processes that lead to the formation of submesoscale eddies on the cyclonic side of the Gulf Stream at the exit of the Florida Straits using very high resolution realistic simulations. The positive relative vorticity and potential vorticity on the cyclonic side of the Gulf Stream are strongly intensified in the Straits due to topographic drag along the continental slope. The bottom drag amplifies the cyclonic shear by generating large positive vertical vorticity values within the sloped turbulent bottom boundary layer. Downstream from the Straits the current becomes unstable to horizontal shear instability, rolls up, and forms a street of submesoscale vortices. The vortices expand as they propagate northward along the shelf, where they can generate large vertical displacements and enhance cross-shelf exchanges. ©2015. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84931575220&doi=10.1002%2f2015GL063731&partnerID=40&md5=f48350d1762fece7575421e57b1c86c0
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9178
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: Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States
Recommended Citation:
Gula J.,Molemaker M.J.,McWilliams J.C.. Topographic vorticity generation, submesoscale instability and vortex street formation in the Gulf Stream[J]. Geophysical Research Letters,2015-01-01,42(10).