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Standing waves during ice breakup in a polar lake
conference contributionposted on 2023-05-23, 09:16 authored by Kirillin, G, Engelhardt, C, Alexander Forrest, Graves, K, Laval, B, Lepparanta, M, Rizk, W
Strong wind events play a crucial role in breaking the seasonal ice sheet in lakes and marginal seas. Still, the mechanism of ice break-up is poorly investigated. We demonstrate that, apart from the obvious effect of horizontal drift, wind produces basin-scale standing waves (seiches) under ice, which, in turn, may essentially contribute to breaking the ice sheet and accelerate ice melting. An extensive dataset on lake physical properties during the ice breakup has been aquired in spring 2013 in polar Lake Kilpisjarvi, Finland. The high-resolution records of pressure, current velocities and water temperature revealed continuous oscillatory motions with periods of 10 to 25 min. The spectral energy peaks resided on frequencies corresponding to the first three eigenfrequencies of the lake indicating the oscillations are produced by the seiche movements at t he lake surface. In agreement with previous studies, seiches persis1ed under ice cover. During the period preceding the breakup, amplitudes of the lake surface oscilations under ice did not exceeded lmm. The ice breakup was associated with a strong wind event and a 10 times increase of seiche amplitudes under ice. We suggest that vertical motions of the soft ice sheet significantly accelerated its melting, so that at the lake surface covered by ice to 80 per cent, the ice completely melted within 10-15 hours.
International Network for Terrestrial Research and Monitoring in the Arctic
Publication titleProceedings of the 22nd IAHR International Symposium on ICE
Department/SchoolAustralian Maritime College
PublisherInternational Association of Hydro-Environment Engineering and Research
Place of publicationSingapore
Event title22nd IAHR International Symposium on ICE 2014
Date of Event (Start Date)2014-08-11
Date of Event (End Date)2014-08-15
Rights statementCopyright 2014 IAHR-ICE Organisers.