West Greenland Ice Sheet melting at the fastest rate in centuries

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Gawdzilla Sama
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West Greenland Ice Sheet melting at the fastest rate in centuries

Post by Gawdzilla Sama » Thu Mar 29, 2018 10:24 am

West Greenland Ice Sheet melting at the fastest rate in centuries
Weather patterns and summer warming trend combine to drive dramatic ice loss

Date: March 28, 2018

Source: Dartmouth College

Summary: New study from the West Greenland Ice Sheet shows that weather patterns and summer warming combine to drive ice loss that is at the highest levels in at least 450 years.
The West Greenland Ice Sheet melted at a dramatically higher rate over the last twenty years than at any other time in the modern record, according to a study led by Dartmouth College. The research, appearing in the journal Geophysical Research Letters, shows that melting in west Greenland since the early 1990s is at the highest levels in at least 450 years.

While natural patterns of certain atmospheric and ocean conditions are already known to influence Greenland melt, the study highlights the importance of a long-term warming trend to account for the unprecedented west Greenland melt rates in recent years. The researchers suggest that climate change most likely associated with human greenhouse gas emissions is the probable cause of the additional warming.

"We see that west Greenland melt really started accelerating about twenty years ago," said Erich Osterberg, assistant professor of earth sciences at Dartmouth and the lead scientist on the project. "Our study shows that the rapid rise in west Greenland melt is a combination of specific weather patterns and an additional long-term warming trend over the last century."

According to research cited in the study, loss of ice from Greenland is one of the largest contributors to global sea level rise. Although glaciers calving into the ocean cause much of the ice loss in Greenland, other research cited in the study shows that the majority of ice loss in recent years is from increased surface melt and runoff.

While satellite measurements and climate models have detailed this recent ice loss, there are far fewer direct measurements of melt collected from the ice sheet itself. For this study, researchers from Dartmouth and Boise State University spent two months on snowmobiles to collect seven ice cores from the remote "percolation zone" of the West Greenland Ice Sheet.
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Re: West Greenland Ice Sheet melting at the fastest rate in centuries

Post by Jim Steele » Thu Mar 29, 2018 9:59 pm

Hmmmm. Greenland melted faster over the past 20 years than it did during the Little Ice Age. ROTFLMAO

And surely much faster than the last Ice Age. ROTFLMAO So what does that tell us?

IPCC reported no net-melting from the 1960s to 1990s. Then WEATHER created by the North Atlantic Oscillation positioned a high pressure system over Greenland, reducing cloud cover and increasing solar heating that caused melting. That melting peaked in 2012 and has since declined. Last year at the end of the September 2017 melt season Greenland gained ice.

So much for CO2 effects!
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Re: West Greenland Ice Sheet melting at the fastest rate in centuries

Post by Gord » Fri Apr 20, 2018 2:50 am

https://www.climate.gov/news-features/f ... inued-2016
Although surface melt on the Greenland Ice Sheet did not set a new record in 2016, the long-term trend of decreasing mass continued, according to the latest Arctic Report Card from NOAA and its partners. Multiple factors likely contributed to ice loss in 2016: early melt-season onset, low reflectiveness (“albedo” to climate experts), and unusually high air temperatures and prolonged melt in some regions.

Adapted from the 2016 Arctic Report Card, this graph shows monthly changes in Greenland's total ice mass between April 2002 and April 2016. The ice mass amounts measured (vertical axis) are relative to the ice mass as of April 2002 (horizontal line set to 0). Report card authors estimated the changes based on measurements by NASA's Gravity Recovery and Climate Experiment (GRACE). The background photo is from Operation IceBridge....
It's got a nice graph, but it ends in 2016. Anybody know where I can find one that includes 2017 yet?
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Re: West Greenland Ice Sheet melting at the fastest rate in centuries

Post by bobbo_the_Pragmatist » Fri Apr 20, 2018 3:35 am

2017----Jim will be happy, an upward blip:
Image
https://www.vox.com/energy-and-environm ... ate-change

when will the deniers learn to accept a trend line?
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Re: West Greenland Ice Sheet melting at the fastest rate in centuries

Post by Gord » Fri Apr 20, 2018 4:01 am

Wrong chart. That only covers the variation over one year. I'm looking for a continuation of the multi-year charts, like this one:

http://nsidc.org/greenland-today/files/ ... ssTrnd.png
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Re: West Greenland Ice Sheet melting at the fastest rate in centuries

Post by bobbo_the_Pragmatist » Fri Apr 20, 2018 5:25 pm

Wow. Nice Chart, rarely do we see trend line so firmly established. Sadly.......now Jimbo has proof every year for about 3 months that global warming has reversed.
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