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Article Dans Une Revue Journal of Geophysical Research. Oceans Année : 2017

The Yermak Pass Branch: a major pathway for the Atlantic water north of Svalbard?

Zoé Koenig
Gilles Garric
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Résumé

An upward-looking Acoustic Doppler Current Profiler deployed from July 2007 to September 2008 in the Yermak Pass, north of Svalbard, gathered velocity data from 570 m up to 90 m at a location covered by sea-ice 10 months out of 12. Barotropic diurnal and semi-diurnal tides are the dominant signals in the velocity (more than 70% of the velocity variance). In winter, baroclinic eddies at periods between 5 and 15 days and pulses of one-to-two month periodicity are observed in the Atlantic Water layer and are associated with a shoaling of the pycnocline. Mercator-Ocean global operational model with daily and 1/12 degree spatial resolution is shown to have skills in representing low frequency velocity variations (>1 month) in the West Spitsbergen Current and in the Yermak Pass. Model outputs suggest that the Yermak Pass Branch has had a robust winter pattern over the last 10 years, carrying on average 31% of the Atlantic Water volume transport of the West Spitsbergen Current (36% in autumn/winter). However those figures have to be considered with caution as the model neither simulates tides nor fully resolves eddies and ignores residual mean currents that could be significant.
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hal-01644657 , version 1 (06-01-2022)

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Zoé Koenig, Christine Provost, Nathalie Sennéchael, Gilles Garric, Jean-Claude Gascard. The Yermak Pass Branch: a major pathway for the Atlantic water north of Svalbard?. Journal of Geophysical Research. Oceans, 2017, 122 (12), pp.9332-9349. ⟨10.1002/2017JC013271⟩. ⟨hal-01644657⟩
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