Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations

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 turbu...

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Published in:Hydrology and Earth System Sciences
Main Authors: G. Kirillin, I. Aslamov, M. Leppäranta, E. Lindgren
Format: Article in Journal/Newspaper
Language:English
Published: Copernicus Publications 2018
Subjects:
T
G
Online Access:https://doi.org/10.5194/hess-22-6493-2018
https://doaj.org/article/28248aa54d224562b03c3abad3a08603
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spelling ftdoajarticles:oai:doaj.org/article:28248aa54d224562b03c3abad3a08603 2023-05-15T14:58:39+02:00 Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations G. Kirillin I. Aslamov M. Leppäranta E. Lindgren 2018-12-01T00:00:00Z https://doi.org/10.5194/hess-22-6493-2018 https://doaj.org/article/28248aa54d224562b03c3abad3a08603 EN eng Copernicus Publications https://www.hydrol-earth-syst-sci.net/22/6493/2018/hess-22-6493-2018.pdf https://doaj.org/toc/1027-5606 https://doaj.org/toc/1607-7938 doi:10.5194/hess-22-6493-2018 1027-5606 1607-7938 https://doaj.org/article/28248aa54d224562b03c3abad3a08603 Hydrology and Earth System Sciences, Vol 22, Pp 6493-6504 (2018) Technology T Environmental technology. Sanitary engineering TD1-1066 Geography. Anthropology. Recreation G Environmental sciences GE1-350 article 2018 ftdoajarticles https://doi.org/10.5194/hess-22-6493-2018 2022-12-31T08:55:46Z 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. Article in Journal/Newspaper Arctic Climate change Directory of Open Access Journals: DOAJ Articles Arctic Arctic Lake ENVELOPE(-130.826,-130.826,57.231,57.231) Hydrology and Earth System Sciences 22 12 6493 6504
institution Open Polar
collection Directory of Open Access Journals: DOAJ Articles
op_collection_id ftdoajarticles
language English
topic Technology
T
Environmental technology. Sanitary engineering
TD1-1066
Geography. Anthropology. Recreation
G
Environmental sciences
GE1-350
spellingShingle Technology
T
Environmental technology. Sanitary engineering
TD1-1066
Geography. Anthropology. Recreation
G
Environmental sciences
GE1-350
G. Kirillin
I. Aslamov
M. Leppäranta
E. Lindgren
Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations
topic_facet Technology
T
Environmental technology. Sanitary engineering
TD1-1066
Geography. Anthropology. Recreation
G
Environmental sciences
GE1-350
description 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.
format Article in Journal/Newspaper
author G. Kirillin
I. Aslamov
M. Leppäranta
E. Lindgren
author_facet G. Kirillin
I. Aslamov
M. Leppäranta
E. Lindgren
author_sort G. Kirillin
title Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations
title_short Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations
title_full Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations
title_fullStr Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations
title_full_unstemmed Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations
title_sort turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations
publisher Copernicus Publications
publishDate 2018
url https://doi.org/10.5194/hess-22-6493-2018
https://doaj.org/article/28248aa54d224562b03c3abad3a08603
long_lat ENVELOPE(-130.826,-130.826,57.231,57.231)
geographic Arctic
Arctic Lake
geographic_facet Arctic
Arctic Lake
genre Arctic
Climate change
genre_facet Arctic
Climate change
op_source Hydrology and Earth System Sciences, Vol 22, Pp 6493-6504 (2018)
op_relation https://www.hydrol-earth-syst-sci.net/22/6493/2018/hess-22-6493-2018.pdf
https://doaj.org/toc/1027-5606
https://doaj.org/toc/1607-7938
doi:10.5194/hess-22-6493-2018
1027-5606
1607-7938
https://doaj.org/article/28248aa54d224562b03c3abad3a08603
op_doi https://doi.org/10.5194/hess-22-6493-2018
container_title Hydrology and Earth System Sciences
container_volume 22
container_issue 12
container_start_page 6493
op_container_end_page 6504
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