The Yermak Pass Branch: a major pathway for the Atlantic water north of Svalbard?
International audience 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...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2017
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Subjects: | |
Online Access: | https://hal.science/hal-01644657 https://hal.science/hal-01644657/document https://hal.science/hal-01644657/file/JGR%20Oceans%20-%202017%20-%20Koenig%20-%20The%20Yermak%20Pass%20Branch%20A%20Major%20Pathway%20for%20the%20Atlantic%20Water%20North%20of%20Svalbard.pdf https://doi.org/10.1002/2017JC013271 |
Summary: | International audience 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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