Friday, November 22, 2013

New paper finds Greenland ice sheet is 'insensitive' to surface melt; lowers sea level projections

In 2012, the mainstream media breathlessly reported that a brief 4-day surface melt over the Greenland ice sheet represented evidence of man-made global warming and an impending rise in sea levels due to melting and sliding of the Greenland ice sheet. However, a new paper published in PNAS finds the "Greenland ice sheet motion is insensitive to exceptional meltwater forcing." The paper adds to other peer-reviewed publications demonstrating that Greenland is resistant to thaw and sea level rise projections greatly exaggerated.

Related papers:

New paper finds Greenland surface melt was due to natural variability

Sea Level Rise Forecasts Helped by Insights Into Glacier Melting

Nov. 22, 2013 — Predictions of sea level rise could become more accurate, thanks to new insight into how glacier movement is affected by melting ice in summer.

Studies of the Greenland ice sheet, including during a record warm summer, are helping scientists better understand how summer conditions affect its flow. This is important for predicting the future contribution made by melting glaciers to sea level rise.
Ice flows slowly from the centre of the Greenland Ice Sheet towards its margins, where it eventually melts or calves into the ocean as icebergs. Knowing how fast this movement occurs is essential for predicting the contribution of the ice sheet to sea level rise.

In summer, ice from the surface of a glacier melts and drains to the bed of the ice sheet, initially raising water pressure at the base and enabling the glacier to slide more quickly. It can, at times, move more than twice as fast in summer compared with winter, they found.

In 2012, an exceptionally warm summer caused the Greenland Ice Sheet to undergo unprecedented rates of melting. However, researchers have found that fast summer ice flow caused by significant melting is cancelled out by slower motion the following winter.

Scientists found that this is because large drainage channels, formed beneath the ice by the meltwater, helped to lower the water pressure, ultimately reducing the sliding speed.

The discovery suggests that movement in the parts of the ice sheet that terminate on land are insensitive to surface melt rates. It improves scientists' understanding of how the ice sheet behaves and curbs error in estimating its contribution to sea level rise in a warming world.

Scientists led by the University of Edinburgh gathered detailed GPS ice flow data and ice surface melt rates along a 115 km transect in west Greenland and compared ice motion from an average melt year, 2009, with the exceptionally warm year of 2012.

The study, carried out in collaboration with the Universities of Sheffield, Aberdeen, Tasmania and Newcastle, was published in Proceedings of the National Academy of Sciences and supported by the Natural Environment Research Council.

Professor Peter Nienow of the University of Edinburgh's School of GeoSciences, who led the study, said: "Although the record summer melt did not intensify ice motion, warmer summers will still lead to more rapid melting of the ice sheet. Furthermore, it is important that we continue to investigate how glaciers that end in the ocean are responding to climate change."

Greenland ice sheet motion insensitive to exceptional meltwater forcing

  1. Matt A. Kingd,e
  1. Edited by Mark H. Thiemens, University of California at San Diego, La Jolla, CA, and approved October 23, 2013 (received for review August 24, 2013)


During summer, meltwater generated on the Greenland ice sheet surface accesses the ice sheet bed, lubricating basal motion and resulting in periods of faster ice flow. However, the net impact of varying meltwater volumes upon seasonal and annual ice flow, and thus sea level rise, remains unclear. In 2012, despite record ice sheet runoff, including two extreme melt events, ice at a land-terminating margin flowed more slowly than in the average melt year of 2009, due principally to slower winter flow following faster summer flow. Our findings suggest that annual motion of land-terminating margins of the ice sheet, and thus the projected dynamic contribution of these margins to sea level rise, is insensitive to melt volumes commensurate with temperature projections for 2100.


  1. I see Professor Lienow had to give the obligatory lip service to global warming there. What he fails to mention is that during warmer times there is more snow over Greenland which, surprise surprise, cancels out the extra melt. Diagram from Richard Alley here:

    Furthermore the lack of sea level rise acceleration confirms that global warming does not cause polar ice sheets to melt. The ice itself is at like -32C. If a few degrees of global warming can melt Greenland how come that didn't happen during the Medieval Warm Period?

  2. Reference for -32C claim of temperature of ice:

  3. Thanks for your comments Paul