DOI: 10.1029/2018JC013770
Scopus记录号: 2-s2.0-85052516951
论文题名: Tidally Modulated Internal Hydraulic Flow and Energetics in the Central Canadian Arctic Archipelago
作者: Hughes K.G. ; Klymak J.M. ; Williams W.J. ; Melling H.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 8 起始页码: 5210
结束页码: 5229
语种: 英语
英文关键词: Canadian Archipelago
; energy budget
; hydraulics
; Kelvin wave
; Moving Vessel Profiler
英文摘要: The Canadian Arctic Archipelago is a key conduit for comparatively fresh Arctic waters flowing to the Atlantic. Model estimates of the freshwater outflow, which is strongly correlated with the volume flux, contain major uncertainties because most existing models exclude tides, marginally resolve the internal Rossby radius, or both. At the same time, barotropic tidal models preclude stratified flow effects. Here we assess the relative importance of barotropic and baroclinic processes to water mass transformation, friction, and energy losses motivated by processes observed in a fine-scale survey in the central Archipelago. A sharp separation of warmed Canada Basin water and locally formed water is observed over a long sill in a narrow channel and coincides with an internal hydraulic jump caused by the mean flow. Tidal currents, however, modulate the jump, as demonstrated by both scale analysis and a two-dimensional simulation. The jump, together with internal tides propagating as Kelvin waves, leads to isopycnal displacements up to 50 m. The generation of these internal Kelvin waves has a leading-order role in a regional energy budget. It is small, however, relative to bottom boundary layer dissipation, which accounts for an estimated 50% of the total tidal energy losses. Consequently, adding tides needs to be a priority for regional models. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113447
Appears in Collections: 气候减缓与适应
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作者单位: School of Earth and Ocean Sciences, University of Victoria, Victoria, BC, Canada; Institute of Ocean Sciences, Fisheries and Oceans Canada, Sidney, BC, Canada
Recommended Citation:
Hughes K.G.,Klymak J.M.,Williams W.J.,et al. Tidally Modulated Internal Hydraulic Flow and Energetics in the Central Canadian Arctic Archipelago[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(8)