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AGU: Geophysical Research Letters

 

Keywords

  • Greenland
  • North Atlantic
  • freshwater
  • runoff

Index Terms

  • 0718 - Tundra
  • 0726 - Ice sheets
  • 0776 - Glaciology
  • 4283 - Water masses
  • 4572 - Upper ocean and mixed layer processes

Paper in Press

GEOPHYSICAL RESEARCH LETTERS, doi:10.1029/2012GL052552

Recent large increases in freshwater fluxes from Greenland into the North Atlantic

Key Points
  • FWF from Greenland increasing faster than known
  • Little impact on Arctic Ocean, significant change to North Atlantic
  • Trend is monotonic and similar order of magnitude to GSA

Authors:

Jonathan L. Bamber

Michiel R. van den Broeke

Janneke Ettema

Jan Thérèse Maria Lenaerts

Eric Rignot

Freshwater (FW) fluxes from river runoff and precipitation minus evaporation for the pan Arctic seas are relatively well documented and prescribed in ocean GCMs. Fluxes from Greenland on the other hand are generally ignored altogether, despite their potential impacts on ocean circulation and marine biology. Here, we present a reconstruction of the spatially distributed FW flux from Greenland for 1958-2010. We find a modest increase into the Arctic Ocean during this period. Fluxes into the Irminger Basin, however, have increased by fifty percent (6.3{plus minus}0.5 km3 yr-2) in less than twenty years. This greatly exceeds previous estimates. For the ice sheet as a whole the rate of increase since 1992 is 16.9{plus minus}1.8 km3 yr-2. The cumulative FW anomaly since 1995 is 3200{plus minus}358 km3, which is about a third of the magnitude of the Great Salinity Anomaly (GSA) of the 1970s. If this trend continues into the future, the anomaly will exceed that of the GSA by about 2025.

Received 1 June 2012; accepted 5 September 2012.

Citation: Bamber, J. L., M. R. van den Broeke, J. Ettema, J. T. M. Lenaerts, and E. Rignot (2012), Recent large increases in freshwater fluxes from Greenland into the North Atlantic, Geophys. Res. Lett., doi:10.1029/2012GL052552, in press.