The effect of flow at Maud Rise on the sea-ice cover – numerical experiments |
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| Authors: | Aike Beckmann Ralph Timmermann Adriene F Pereira Christian Mohn |
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| Institution: | (1) Alfred Wegener Institute for Polar and Marine Research, PO Box 120161, 27515 Bremerhaven, Germany e-mail: beckmann@awi-bremerhaven.de, DE |
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| Abstract: | The role of seamounts in the formation and evolution of sea ice is investigated in a series of numerical experiments with
a coupled sea ice–ocean model. Bottom topography, stratification and forcing are configured for the Maud Rise region in the
Weddell Sea. The specific flow regime that develops at the seamount as the combined response to steady and tidal forcing consists
of free and trapped waves and a vortex cap, which is caused by mean flow and tidal flow rectification. The enhanced variability
through tidal motion in particular modifies the mixed layer above the seamount enough to delay and reduce sea-ice formation
throughout the winter. The induced sea-ice anomaly spreads and moves westward and affects an area of several 100 000 km2. Process studies reveal the complex interaction between wind, steady and periodic ocean currents: all three are required
in the process of generation of the sea ice and mixed layer anomalies (mainly through tidal flow), their detachment from the
topography (caused by steady oceanic flow) and the westward translation of the sea-ice anomaly (driven by the time-mean wind). |
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| Keywords: | Maud Rise Polynya Ice– ocean modelling Tides Seamounts |
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