Labrador Sea freshening linked to Beaufort Gyre freshwater release

The Beaufort Gyre (BG), the largest Arctic Ocean freshwater reservoir, has drastically increased its liquid freshwater content by 40% in the past two decades. If released within a short period, the excess freshwater could potentially impact the large-scale ocean circulation by freshening the upper s...

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Bibliographic Details
Published in:Nature communications 2021-02, Vol.12 (1), p.1229-1229, Article 1229
Main Authors: Zhang, Jiaxu, Weijer, Wilbert, Steele, Michael, Cheng, Wei, Verma, Tarun, Veneziani, Milena
Format: Article
Language:English
Subjects:
704/106/694/1108
704/106/829/2737
704/829/2737
Archipelagoes
climate and earth system modelling
earth sciences
ENVIRONMENTAL SCIENCES
Fluxes
Fresh water
Humanities and Social Sciences
Laboratories
Meltwater
multidisciplinary
Ocean circulation
Ocean currents
physical oceanography
Salinity
Science
Science (multidisciplinary)
Sea ice
Tracers
Water circulation
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Summary:The Beaufort Gyre (BG), the largest Arctic Ocean freshwater reservoir, has drastically increased its liquid freshwater content by 40% in the past two decades. If released within a short period, the excess freshwater could potentially impact the large-scale ocean circulation by freshening the upper subpolar North Atlantic. Here, we track BG-sourced freshwater using passive tracers in a global ocean sea-ice model and show that this freshwater exited the Arctic mostly through the Canadian Arctic Archipelago, rather than Fram Strait, during an historical release event in 1983–1995. The Labrador Sea is the most affected region in the subpolar North Atlantic, with a freshening of 0.2 psu on the western shelves and 0.4 psu in the Labrador Current. Given that the present BG freshwater content anomaly is twice the historical analog studied here, the impact of a future rapid release on Labrador Sea salinity could be significant, easily exceeding similar fluxes from Greenland meltwater. The Beaufort Gyre in the western Arctic Ocean has accumulated a large amount of freshwater. Here, the authors show that a historical release in the 1980s resulted in a strong freshening of the western Labrador Sea, suggesting that a future release of the current freshwater volume could even be more impactful.
ISSN:2041-1723
2041-1723
DOI:10.1038/s41467-021-21470-3