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...
Published in: | Hydrology and Earth System Sciences |
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2018
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ftleibnizopen:oai:oai.leibnizopen.de:NVq18IgBdbrxVwz6tvtW 2023-07-16T03:56:37+02:00 Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations Kirillin, Georgiy Aslamov, Ilya Leppäranta, Matti Lindgren, Elisa 2018 https://repository.publisso.de/resource/frl:6415334 https://doi.org/10.5194/hess-22-6493-2018 http://www.flake.igb-berlin.de/LacunaData/ eng eng https://creativecommons.org/licenses/by/4.0/ Hydrology and earth system sciences, 22(12):6493-504 2018 ftleibnizopen https://doi.org/10.5194/hess-22-6493-2018 2023-06-25T23:29:49Z 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. Other/Unknown Material Arctic Climate change LeibnizOpen (The Leibniz Association) 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 |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
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. |
author |
Kirillin, Georgiy Aslamov, Ilya Leppäranta, Matti Lindgren, Elisa |
spellingShingle |
Kirillin, Georgiy Aslamov, Ilya Leppäranta, Matti Lindgren, Elisa Turbulent mixing and heat fluxes under lake ice: the role of seiche oscillations |
author_facet |
Kirillin, Georgiy Aslamov, Ilya Leppäranta, Matti Lindgren, Elisa |
author_sort |
Kirillin, Georgiy |
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 |
publishDate |
2018 |
url |
https://repository.publisso.de/resource/frl:6415334 https://doi.org/10.5194/hess-22-6493-2018 http://www.flake.igb-berlin.de/LacunaData/ |
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, 22(12):6493-504 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
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 |
_version_ |
1771543052035293184 |