Emerging impact of Greenland meltwater on deepwater formation in the North Atlantic Ocean

Claus W Böning, Erik Behrens, Arne Biastoch, Klaus Getzlaff, Jonathan L Bamber

Research output: Contribution to journalLetter (Academic Journal)peer-review

127 Citations (Scopus)
373 Downloads (Pure)

Abstract

The Greenland Ice sheet has experienced increasing mass loss since the 1990s. The enhanced freshwater flux due to both surface melt and outlet glacier discharge is assuming an increasingly important role in the changing freshwater budget of the subarctic Atlantic. The sustained and increasing freshwater fluxes from Greenland to the surface ocean could lead to a suppression of deep winter convection in the Labrador Sea, with potential ramifications for the strength of the Atlantic meridional overturning circulation (AMOC). Here we assess the impact of the increases in the freshwater fluxes, reconstructed with full spatial resolution, using a global ocean circulation model with a grid spacing fine enough to capture the small-scale, eddying transport processes in the subpolar North Atlantic. Our simulations suggest that the invasion of meltwater from the West Greenland shelf has initiated a gradual freshening trend at the surface of the Labrador Sea. While the freshening is still smaller than the variability associated with the episodic ‘great salinity anomalies’, the accumulation of meltwater may become large enough to progressively dampen the deep winter convection in the coming years. We conclude that the freshwater anomaly has not yet had a significant impact on the Atlantic meridional overturning circulation.
Original languageEnglish
Pages (from-to)523-527
Number of pages5
JournalNature Geoscience
Volume9
Issue number7
Early online date20 Jun 2016
DOIs
Publication statusPublished - 1 Jul 2016

Keywords

  • Physical oceanography
  • Projection and prediction

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