DOI: 10.5194/hess-22-6493-2018
论文题名: Turbulent mixing and heat fluxes under lake ice: The role of seiche oscillations
作者: Kirillin G. ; Aslamov I. ; Leppäranta M. ; Lindgren E.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2018
卷: 22, 期: 12 起始页码: 6493
结束页码: 6504
语种: 英语
Scopus关键词: Climate change
; Energy dissipation
; Heat flux
; Heat transfer
; Kinetic energy
; Kinetics
; Lakes
; Mixing
; Shock tubes
; Temperature
; Turbulent flow
; Current velocity
; Dissipation rates
; Ice-water interfaces
; Interfacial layer
; Seiche oscillations
; Turbulent kinetic energy
; Turbulent mixing
; Water temperatures
; Ice
; climate change
; current velocity
; energy dissipation
; heat budget
; heat flux
; heat transfer
; ice cover
; seiche
; temperature gradient
; turbulent mixing
; water temperature
; Arctic
英文摘要: We performed a field study on mixing and vertical heat transport under the ice cover of an Arctic lake. Mixing intensities were estimated from small-scale oscillations of water temperature and turbulent kinetic energy dissipation rates derived from current velocity fluctuations. Well-developed turbulent conditions prevailed in the stably stratified interfacial layer separating the ice base from the warmer deep waters. The source of turbulent mixing was identified as whole-lake (barotropic) oscillations of the water body driven by strong wind events over the ice surface. We derive a scaling of ice-water heat flux based on dissipative Kolmogorov scales and successfully tested against measured dissipation rates and under-ice temperature gradients. The results discard the conventional assumption of nearly conductive heat transport within the stratified under-ice layer and suggest contribution of the basal heat flux into the melt of ice cover is higher than commonly assumed. Decline of the seasonal ice cover in the Arctic is currently gaining recognition as a major indicator of climate change. The heat transfer at the ice-water interface remains the least studied among the mechanisms governing the growth and melting of seasonal ice. The outcomes of the study find application in the heat budget of seasonal ice on inland and coastal waters. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163106
Appears in Collections: 气候变化与战略
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作者单位: Kirillin, G., Department of Ecohydrology, Lebiniz-Institute of Freshwater Ecology and Inland Fisheries (IGB), Berlin, Germany; Aslamov, I., Limnological Institute, Siberian Branch of Russian Academy of Science (LIN SB RAS), Irkutsk, Russian Federation; Leppäranta, M., Institute of Atmospheric and Earth Sciences, University of Helsinki, Helsinki, Finland; Lindgren, E., Department of Physics, University of Helsinki, Helsinki, Finland
Recommended Citation:
Kirillin G.,Aslamov I.,Leppäranta M.,et al. Turbulent mixing and heat fluxes under lake ice: The role of seiche oscillations[J]. Hydrology and Earth System Sciences,2018-01-01,22(12)