New cause of exceptional Greenland melt revealed

April 1, 2016, York University
Researchers service one of PROMICE's automatic weather stations on the Greenland ice sheet that was used in the study. Credit: William Colgan, York University

A new study by researchers from Denmark and Canada's York University, published in Geophysical Research Letters, has found that the climate models commonly used to simulate melting of the Greenland ice sheet tend to underestimate the impact of exceptionally warm weather episodes on the ice sheet.

The study investigated the causes of during two exceptional melt episodes in 2012, which occurred from July 8 to 11 and from July 27 to 28. During these exceptional melt episodes, which can be regarded as an analogue to future climate, unusually warm and moist air was transported onto the . During one episode, the researchers measured the ice sheet melting at more than 28 cm per day, the largest daily melt rate ever documented on the ice sheet. While the two brief melt episodes only lasted six days combined, or six per cent of the melt season, they contributed to 14 per cent of the total melt.

Using the Programme for Monitoring of the Greenland Ice Sheet (PROMICE) automatic weather station data, the researchers ranked the energy sources contributing to surface melt during 2012 at twelve PROMICE sites around the ice sheet periphery. While ice sheet melt is usually dominated by the radiant energy associated with sunlight, the researchers found that the energy associated with air temperature and moisture content, rather than radiant energy, was responsible for more melt during the 2012 exceptional melt episodes.

As Robert Fausto of the Geological Survey of Denmark and Greenland, lead author of the study, says, "When we were analysing our weather station data, we were quite surprised, that the exceptional melt rates we observed were primarily caused by warm and moist air, because ice sheet wide melt is usually dominated by radiant energy from sunlight. "

This finding has implications for how the scientific community projects future ice sheet melt using climate models. In the study, the researchers also show that while the models presently used to project ice sheet melt can accurately simulate melt due to radiant energy, models tend to systematically underestimate melt due to the non-radiant energy processes they document.

"Glaciological instrumentation capable of automatically recording the daily rate of melting in exceptional melt circumstances, where the ice surface lowers by close to 10 m in a few months, has only emerged in the last decade or so, thanks to PROMICE. The detail of PROMICE observations is permitting new insights on brief, but consequential, exceptional melt events," says William Colgan of the Lassonde School of Engineering at York University, a co-author of the study.

Fausto adds that, "Exceptional melt episodes dominated by non-radiant energy are expected to occur more frequently in the future due to climate change. This makes it critical to better understand the influence of these episodes on ice sheet health."

Explore further: 'Blocking-high' pressure systems spawn most of the warming that melts Greenland surface ice, study says

More information: Robert S. Fausto et al. The implication of non-radiative energy fluxes dominating Greenland ice sheet exceptional ablation area surface melt in 2012, Geophysical Research Letters (2016). DOI: 10.1002/2016GL067720

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1 / 5 (11) Apr 01, 2016
2.5 / 5 (8) Apr 01, 2016
According to my thermometer, the temperature outdoors is 8F lower than it was yesterday afternoon at this time.

The trend is obvious. A simple extrapolation indicates the average surface temperature of Earth will reach absolute zero (-273C) on June 4th.

So much for "global warming"!
1.4 / 5 (11) Apr 01, 2016
"models tend to systematically underestimate melt due to the non-radiant energy processes..." NO! Models tend to systematically be inaccurate because a general lack of being able to accurately include all the variables necessary to produce a correct answer.
1 / 5 (6) Apr 02, 2016
the researchers also show that while the models presently used to project ice sheet melt can accurately simulate melt due to radiant energy, models tend to systematically underestimate melt due to the non-radiant energy processes they document.

The unmentioned consequence is that when the models are trying to include these exceptional events using the radiant melting processes to match the empirical data, they automatically have to exaggerate the effect of radiant warming because they have to amplify the effect of the usual climate to compensate for the lack in the models.

What the article is saying is that the models systematically over-estimate the greenhouse gas effect and predict more future warming because they neglect some of the internal shifts in the energy contents of the atmosphere.
1 / 5 (5) Apr 02, 2016
Further analysis would likely reveal these "exceptional" events as a product of solar induction heating.
5 / 5 (6) Apr 02, 2016
Models always evolve by modelling, measuring and then improving the model.
Next they will have to include the decreasing albedo as pollutants concentrate from the layers of melted ice onto the ice below: And the decreasing melting point caused by those same pollutants. Like putting soot and salt onto ice.

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