Increasing meltwater discharge from the Nuuk region of the Greenland ice sheet and implications for mass balance (1960-2012)

Dirk van As, Morten Langer Andersen, Dorthe Petersen, Xavier Fettweis, Jan H. van Angelen, Jan T. M. Lenaerts, Michiel R. van den Broeke, James M. Lea, Carl Egede Bøggild, Andreas P. Ahlstrøm, Konrad Steffen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We assess the runoff and surface mass balance (SMB) of the Greenland ice sheet in the Nuuk region (southwest) using output of two regional climate models (RCMs) evaluated by observations. The region encompasses six glaciers that drain into Godthåbsfjord. RCM data (1960-2012) are resampled to a high spatial resolution to include the narrow (relative to the native grid spacing) glacier trunks in the ice mask. Comparing RCM gridded results with automaticweather station (AWS) point measurements reveals that locally models can underestimate ablation andoverestimate accumulation by up to tens of per cent. However, comparison with lake discharge indicates that modelled regional runoff totals are more accurate. Model results show that melt and runoff in the Nuuk region have doubled over the past wo decades. Regional SMB attained negative values in recent high-melt years. Taking into account frontal ablation of the marine-terminating glaciers, the region lost 10-20km3w.e. a-1 in 2010-12. If 2010 melting prevails during the remainder of this century, a low-end estimate of sea-level rise of 5mm is expected by 2100 from this relatively small section (2.6%) of the ice sheet alone.
Original languageEnglish
JournalJournal of Glaciology
Volume60
Issue number220
Pages (from-to)314-322
Number of pages9
ISSN0022-1430
DOIs
Publication statusPublished - 2014

Keywords

  • Earth-Surface Processes
  • Glacier meteorology
  • Ice-sheet mass balance
  • Ice/atmosphere interactions
  • Surface melt
  • ablation
  • air-ice interaction
  • atmosphere-ice-ocean system
  • geoaccumulation
  • glacier dynamics
  • glacier mass balance
  • ice core
  • ice sheet
  • melting
  • meltwater
  • runoff
  • sea ice
  • sea level change
  • Arctic
  • Greenland
  • Greenland Ice Sheet
  • Nuuk

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