How much of Greenland's ice melted during past periods of global warming? Two first-of-their-kind studies in Nature look much deeper into the history of Greenland than previous techniques allowed. One of the studies, led by University of Vermont geologist Paul Bierman, concludes that East Greenland -- like the coastal scene shown in this image from near Tasiilaq -- has been actively scoured by glacial ice for much of the last 7.5 million years. The other study presents contrasting results suggesting the disappearance of the ice sheet over the center of Greenland during at least some of the Pleistocene. The two studies improve our understand of Greenland's deep past, while raising questions about both the past and future of its giant ice sheet in a changing climate. CREDIT Joshua Brown/UVM

Studies worry: Is Greenland on thin ice?

From the UNIVERSITY OF VERMONT Greenland on thin ice? Two studies in Nature open deep history of Greenland’s ice sheet — and raise new questions about its stability The ice sheet covering Greenland is four times bigger than California — and holds enough water to raise global sea-level more than twenty feet if most of it…

Image of Greenland glaciers and icebergs from lifeonthinice.com

Oh, darn. Study: Most meltwater in Greenland fjords likely comes from icebergs, not glaciers

From the AMERICAN GEOPHYSICAL UNION Most meltwater in Greenland fjords likely comes from icebergs, not glaciers WASHINGTON, DC — Icebergs contribute more meltwater to Greenland’s fjords than previously thought, losing up to half of their volume as they move through the narrow inlets, according to new research. Greenland, the world’s largest island, is almost entirely…

This image shows a darkened glacial surface. CREDIT NIPR

Study: ‘accelerated melting of the lower Greenland ice sheet’ due to bacteria darkening the surface albedo

From RESEARCH ORGANIZATION OF INFORMATION AND SYSTEMS and the “dirty snow” department. Factors promoting growth of cryoconite granule formation and glacial/ice sheet melting Cryoconite granules (see Figure 1) are dark, millimeter-sized aggregations of bacteria and algae, mineral particles and organic matter that form on the surface of glaciers. They are also known to be a significant…

Figure 2

In Honor of Secretary of State John Kerry’s Global Warming Publicity-Founded Visit to Greenland…

…A Few Model-Data Comparisons of Greenland Surface Air Temperatures Guest Post by Bob Tisdale Mass losses from Greenland’s ice sheets have been one of the focuses of alarmists for decades. In fact, last week, U.S. Secretary of State John Kerry visited Greenland on a (boreal) summertime tour of parts of Greenland in an apparent political…