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Role of Greenland Freshwater Anomaly in the Recent Freshening of the Subpolar North Atlantic

Research output: Contribution to journalArticle (Academic Journal)

  • D. S. Dukhovskoy
  • I. Yashayaev
  • A. Proshutinsky
  • J. L. Bamber
  • I. L. Bashmachnikov
  • E. P. Chassignet
  • C. M. Lee
  • A. J. Tedstone
Original languageEnglish
Pages (from-to)3333-3360
Number of pages28
JournalJournal of Geophysical Research: Oceans
Volume124
Issue number5
Early online date26 Apr 2019
DOIs
DateAccepted/In press - 14 Apr 2019
DateE-pub ahead of print - 26 Apr 2019
DatePublished (current) - 1 May 2019

Abstract

The cumulative Greenland freshwater flux anomaly has exceeded 5,000 km 3 since the 1990s. The volume of this surplus freshwater is expected to cause substantial freshening in the North Atlantic. Analysis of hydrographic observations in the subpolar seas reveals freshening signals in the 2010s. The sources of this freshening are yet to be determined. In this study, the relationship between the surplus Greenland freshwater flux and this freshening is tested by analyzing the propagation of the Greenland freshwater anomaly and its impact on salinity in the subpolar North Atlantic based on observational data and numerical experiments with and without the Greenland runoff. A passive tracer is continuously released during the simulations at freshwater sources along the coast of Greenland to track the Greenland freshwater anomaly. Tracer budget analysis shows that 44% of the volume of the Greenland freshwater anomaly is retained in the subpolar North Atlantic by the end of the simulation. This volume is sufficient to cause strong freshening in the subpolar seas if it stays in the upper 50–100 m. However, in the model the anomaly is mixed down to several hundred meters of the water column resulting in smaller magnitudes of freshening compared to the observations. Therefore, the simulations suggest that the accelerated Greenland melting would not be sufficient to cause the observed freshening in the subpolar seas and other sources of freshwater have contributed to the freshening. Impacts on salinity in the subpolar seas of the freshwater transport through Fram Strait and precipitation are discussed.

    Structured keywords

  • GlobalMass

    Research areas

  • freshwater anomaly, freshwater budget, Greenland ice sheet melting, passive tracer numerical experiment, subpolar gyre, subpolar North Atlantic

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    Rights statement: This is the final published version of the article (version of record). It first appeared online via Wiley at https://doi.org/10.1029/2018JC014686. Please refer to any applicable terms of use of the publisher.

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    Licence: CC BY

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