Environment Forum

Greenland ice melt sets a record — and could set the stage for sea level rise

camp1Greenland’s ice sheet melted at a record rate in 2010, and this could be a major contributor to sea level rise in coming decades.

The ice in Greenland melted so much last year that it formed rivers and lakes on top of the vast series of glaciers that covers much of the big Arctic island, with waterfalls flowing through cracks and holes toward the bottom of the ice sheet. Take a look at video from Marco Tedesco of City College of New York, who is leading a project to study what factors affect ice sheet melting. The photo at left shows a camp by the side of a stream flowing from a lake — all of it on top of the ice sheet.

“This past melt season was exceptional, with melting in some areas stretching up to 50 days longer than average,” Tedesco said in a statement.  “Melting in 2010 started exceptionally early at the end of April and ended quite late in mid- September.”

Summer 2010 temperatures in Greenland were up to 5.4 degrees F (3 degrees C) above average, and there was reduced snowfall, Tedesco and his co-authors noted in an article in the current edition of Environmental Research Letters. Nuuk, Greenland’s capital, had the warmest spring and summer since records began there in 1873. Average summer temperatures vary widely, but in coastal areas hover around freezing.

This is in tune with studies released in the last week by the U.S. National Oceanic and Atmospheric Administration and the World Meteorological Organization finding 2010 was tied with 2005 and 1998 for the warmest year since modern global temperature record-keeping began in 1880.

Antarctica warms; scientists say we’re to blame

New research shows that both Antarctica and the Arctic are getting less icy – and the best explanation is mankind’s emissions of greenhouse gases.

But will that convert anyone who doubts that global warming is caused by human activities, led by burning fossil fuels?

The scientists, writing in the journal Nature Geoscience, say that a study of temperature records from Antarctica (there aren’t many of them) shows a slight rising trend over recent decades that can be best explained by a build-up of greenhouse gases led by carbon dioxide.

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