Climate: Extreme Greenland Ice Sheet melting episodes change runoff regime

“When warm temperatures in 2012 caused an extreme melting episode across much of the Greenland Ice Sheet, it may have fundamentally altered the way the near-surface snow layers absorb water, according to a new study published in Nature Climate Change.
“The melting resulted in the formation of a thick layer of ice atop the previously porous surface. Subsequently, meltwater ran off the surface and to the ocean, with potential impacts on sea level, according to York University Professor William Colgan.
“Because the models scientists use to project Greenland’s sea level rise contribution do not presently take firn cap-off into consideration, it means that Greenland’s projected sea level rise due to meltwater runoff is likely higher than previously predicted. Getting this newly observed physical process into these models is an important next step for the team.”  from: summitcountyvoice.com

GR:  This helps explain the rapid formation of the cold pool of water in the North Atlantic (https://garryrogers.com/2015/03/24/whats-going-on-in-the-north-atlantic/).

 

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