DOI: 10.1038/ngeo2350
论文题名: Tide-mediated warming of Arctic halocline by Atlantic heat fluxes over rough topography
作者: Rippeth T.P. ; Lincoln B.J. ; Lenn Y.-D. ; Green J.A.M. ; Sundfjord A. ; Bacon S.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 3 起始页码: 191
结束页码: 194
语种: 英语
Scopus关键词: continental slope
; double diffusion
; halocline
; heat flux
; inflow
; microstructure
; ocean tide
; topography
; vertical mixing
; Arctic Ocean
英文摘要: The largest oceanic heat input to the Arctic Ocean results from inflowing Atlantic water. This inflowing water is warmer than it has been in the past 2,000 years. Yet the fate of this heat remains uncertain, partly because the water is relatively saline, and thus dense: it therefore enters the Arctic Ocean at intermediate depths and is separated from surface waters by stratification. Vertical mixing is generally weak within the Arctic Ocean basins, with very modest heat fluxes (0.05-0.3 W m -2) arising largely from double diffusion. However, geographically limited observations have indicated substantially enhanced turbulent mixing rates over rough topography. Here we present pan-Arctic microstructure measurements of turbulent kinetic energy dissipation. Our measurements further demonstrate that the enhanced continental slope dissipation rate, and by implication vertical mixing, varies significantly with both topographic steepness and longitude. Furthermore, our observations show that dissipation is insensitive to sea-ice conditions. We identify tides as the main energy source that supports the enhanced dissipation, which generates vertical heat fluxes of more than 50 W m -2. We suggest that the increased transfer of momentum from the atmosphere to the ocean as Arctic sea ice declines is likely to lead to an expansion of mixing hotspots in the future Arctic Ocean. © 2015 Macmillan Publishers Limited. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106339
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: School of Ocean Sciences, Bangor University, Bangore, United Kingdom; Norwegian Polar Institute, Fram Centre, TromsØ, Norway; National Oceanography Centre, Southampton, United Kingdom
Recommended Citation:
Rippeth T.P.,Lincoln B.J.,Lenn Y.-D.,et al. Tide-mediated warming of Arctic halocline by Atlantic heat fluxes over rough topography[J]. Nature Geoscience,2015-01-01,8(3)