2022
DOI: 10.5194/tc-2021-390
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Reversal of ocean gyres near ice shelves in the Amundsen Sea caused by the interaction of sea ice and wind

Abstract: Abstract. Floating ice shelves buttress the Antarctic Ice Sheet, which is losing mass rapidly mainly due to ocean-driven melting and the associated disruption to glacial dynamics. The local ocean circulation near ice shelves is therefore important for the prediction of future ice mass loss and related sea-level rise as it determines the water mass exchange, heat transport under the ice shelf and the resultant melting. However, the dynamics controlling the near-coastal circulation are not fully understood. A cy… Show more

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Cited by 2 publications
(7 citation statements)
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“…Theories suggest that when the ocean is sea-ice free and/or the sea-ice is mobile, momentum transfer from the wind into the ocean is higher (e.g., ref. 32), which can intensify the PIB gyre 33 . This is further confirmed by a model simulation which shows steeper isopycnals at the gyre's boundary in February-March 2020 (i.e., sea-ice-free conditions; Fig.…”
Section: Driving Forces For the Flow Under Teismentioning
confidence: 99%
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“…Theories suggest that when the ocean is sea-ice free and/or the sea-ice is mobile, momentum transfer from the wind into the ocean is higher (e.g., ref. 32), which can intensify the PIB gyre 33 . This is further confirmed by a model simulation which shows steeper isopycnals at the gyre's boundary in February-March 2020 (i.e., sea-ice-free conditions; Fig.…”
Section: Driving Forces For the Flow Under Teismentioning
confidence: 99%
“…1c-e and 8a). Conversely, landfast sea-ice cover or high concentration of less-mobile seaice in PIB reduces the surface momentum transfer into the ocean, weakening the gyre 33 . Our model confirms the weakening of the PIB gyre in the sea-ice-covered period of August-September 2020 (Fig.…”
Section: Driving Forces For the Flow Under Teismentioning
confidence: 99%
“…Polar ocean gyres tend to weaken during periods of extensive sea-ice coverage and less mobile sea-ice (e.g., refs. [32][33][34][35][36] ). Moreover, a gyre not only weakens under the presence of high concentrations of landfast-ice but may also reverse its direction from clockwise to anticlockwise depending on the strength and angle between the wind direction and the sea-ice edge 33 .…”
Section: Discussionmentioning
confidence: 99%
“…[32][33][34][35][36] ). Moreover, a gyre not only weakens under the presence of high concentrations of landfast-ice but may also reverse its direction from clockwise to anticlockwise depending on the strength and angle between the wind direction and the sea-ice edge 33 . A change in the gyre direction could warm the ice-shelf cavities even faster than the simple spin-down suggested in this work because it could lift the isopycnals further up beneath the ice shelf and bring deeper warm waters upwards.…”
Section: Discussionmentioning
confidence: 99%
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