Tidal ice dynamics in the area of Svalbard and Frans Josef Land

Dmitriev, Nikita; Proshutinsky, Andrey; Løyning, Terje Brinck; Vinje, Torgny

doi:10.3402/polar.v9i2.6791

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…The tidal currents seem to go from south to north while the beacon movements are north to south. This could be due to southwesterly winds as seen in the tidal ice dynamics study of Dmitriev et al (1991) for the same area. In fact, Dmitriev et al (1991) studied that under strong tidal forcing, elliptical shape traces are formed in the ice field signifying a tidal ice drift in the Marginal Ice Zone areas with ice concentration around 70% .…”

Section: Buoy Observationsmentioning

confidence: 82%

Tidal dissipation from free drift sea ice in the Barents Sea assessed using GNSS beacon observations

et al. 2022

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One of the major challenges facing global hydrodynamic tidal models is the modelling of the interaction between sea ice and tides in high-latitude waters. Recent studies have shown strong seasonal correlation between sea ice and tides. Hence, it is important to accurately model the effect of sea ice in a tidal model. Presence of sea ice leads to a frictional dissipation of tides. Most models either completely ignore sea ice or partly include it by assuming a fixed sea ice cover (landfast ice). However, sea ice can also be drifting and the nature of dissipation between drifting sea ice and tides is partly unknown. We assess the dissipation of tides due to free drift sea ice. In the absence of wind, this is negligible in the deeper and open ocean. For the shallow water regions, however, this dissipation is unknown. Here, we evaluate this dissipation for the Spitzbergen Shelf region using a beacon dataset showing strong free drift subdaily sea ice oscillations and a physics based point ice model. Two analyses were done which compared the model and observed motion. The analyses showed that for winds speeds below 8m/s and with low subdaily signals, the subdaily free drift sea ice motion is strongly connected to the tides and that the frictional dissipation is low. In the context of global tide and storm surge models, the dissipation from free drift sea ice on tides should be evaluated based on the region (deep ocean or shallow water) and existing wind conditions. In the presence of strong winds the dissipation between free drift sea ice and air can be significant on a subdaily scale even if there are no subdaily signals in the wind itself.

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Section: Buoy Observationsmentioning

confidence: 82%

Tidal dissipation from free drift sea ice in the Barents Sea assessed using GNSS beacon observations

et al. 2022

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“…Satellite image of ice cover in the vicinity of Spitsbergen on June 1, 1988, from Dmitriev et al [1991] with permission from Polar Research. Elliptically shaped leads are formed behind grounded icebergs as sea ice is driven by tidal currents.…”

Section: Introductionmentioning

confidence: 99%

Role of tides in Arctic ocean/ice climate

Holloway

Proshutinsky

2007

J. Geophys. Res.

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[1] A three-dimensional coupled ocean/ice model, intended for long-term Arctic climate studies, is extended to include tidal effects. From saved output of an Arctic tides model, we introduce parameterizations for (1) enhanced ocean mixing associated with tides and (2) the role of tides fracturing and mobilizing sea ice. Results show tides enhancing loss of heat from Atlantic waters. The impact of tides on sea ice is more subtle as thinning due to enhanced ocean heat flux competes with net ice growth during rapid openings and closings of tidal leads. Present model results are compared with an ensemble of nine models under the Arctic Ocean Model Intercomparison Project (AOMIP). Among results from AOMIP is a tendency for models to accumulate excessive Arctic Ocean heat throughout the intercomparison period 1950 to 2000 which is contrary to observations. Tidally induced ventilation of ocean heat reduces this discrepancy.

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