A closer look at subglacial glacier cavities and water pressure

A collection of science around subglacial glacier’s, cavities and about water pressure/water flow. Though someone pointed out that most of the items are focused on land based glaciers, rather than on the WAIS which is a marine ice sheet. However, i welcome all contribution in the comment section which helps to better understand marine ice…

Stable Antarctic Permafrost Melting Faster than Expected

University of Texas: July 24, 2013 AUSTIN, Texas — For the first time, scientists have documented an acceleration in the melt rate of permafrost, or ground ice, in a section of Antarctica where the ice had been considered stable. The melt rates are comparable with the Arctic, where accelerated melting of permafrost has become a…

Understanding the long-term carbon-cycle: weathering of rocks – a vitally important carbon-sink

By John Mason / SkepticalScience   above: the processes of the long-term carbon-cycle that this post explores. Graphic: jg. This post delves into the long-term carbon cycle that involves the interactions of the atmosphere with rocks and oceans over many millions of years. Because of its length, I’ve broken it up into bookmarked sections for…

ScienceCasts: The “Sleeping Giant” in Arctic Permafrost

Visit science.nasa.gov/ for breaking science news. Arctic permafrost soils contain more accumulated carbon than all the human fossil-fuel emissions since 1850 combined. Warming Arctic permafrost, poised to release its own gases into the atmosphere, could be the “sleeping giant” of climate change. NASA Finds ‘Amazing’ Levels Of Arctic Methane And CO2, Asks ‘Is a Sleeping Climate Giant Stirring…

Estimating the permafrost-carbon feedback on global warming

A key uncertainty is the fraction of carbon that might be decomposed under anaerobic conditions – resulting potentially in methane emissions to the atmosphere. Given the high warming potential of methane, the overall magnitude of the permafrost-carbon feedback will depend strongly on this fraction. Thawing of permafrost and the associated release of carbon constitutes a…

Soil carbon and climate change: from the Jenkinson effect to the compost-bomb instability

Study: Long-term warming equivalent to 10°C per century could be sufficient to trigger compost-bomb instability in drying organic soils Wiley: First generation climate–carbon cycle models suggest that climate change will suppress carbon accumulation in soils, and could even lead to a net loss of global soil carbon over the next century. These model results are qualitatively…

Geologic methane seeps along boundaries of Arctic permafrost thaw and melting glaciers

Release of 14C-depleted methane to the atmosphere from abundant gas seeps concentrated along boundaries of permafrost thaw and receding glaciers in Alaska and Greenland Nature Geoscience (2012) Abstract Methane, a potent greenhouse gas, accumulates in subsurface hydrocarbon reservoirs, such as coal beds and natural gas deposits. In the Arctic, permafrost and glaciers form a ‘cryosphere…

First evidence of under-ice volcanic eruption in Antarctica

The first evidence of a volcanic eruption from beneath Antarctica’s most rapidly changing ice sheet. The volcano on the West Antarctic Ice Sheet erupted 2000 years ago (325BC) and remains active. Using airborne ice-sounding radar, scientists from British Antarctic Survey (BAS) discovered a layer of ash produced by a ‘subglacial’ volcano. It extends across an…

Hidden rift valley discovered beneath West Antarctica reveals new insight into ice loss

EurekAlert British Antarctic Survey Jul 25 2012: Scientists have discovered a one mile deep rift valley hidden beneath the ice in West Antarctica, which they believe is contributing to ice loss from this part of the continent. Experts from the University of Aberdeen and British Antarctic Survey (BAS) made the discovery below Ferrigno Ice Stream,…

How Hot will it Get?

The latest projections about the extent of planetary warming and the dire consequences of our growing carbon imbalance. Series: “Science at the Theater” [Science] A special Earth Day edition of Science at the Theater —”How Hot Will It Get?” — Featuring presentations by Lab climate scientists Bill Collins, Margaret Torn, Michael Wehner, and Jeff Chambers,…

Permafrost: The Tipping Time Bomb

“If we can limit our emissions, then the permafrost region will release less carbon to the atmosphere, there is a curve – it’s not a all or nothing question.” Ben Abbott One of the most feared of climate change “feedbacks” is the potential release of greenhouse gases by melting arctic permafrost soils. New research indicates…