Blog edited by Sam Carana, with news on climate change and warming in the Arctic due to snow and ice loss and methane releases from the seafloor.
Jun 30, 2018 · The last significant Arctic ice loss occurred in the Eemian interglacial around 125 thousand years ago when summer insolation in the Arctic climate increased by 11–13% causing a seasonal loss of Arctic sea-ice, northward advance of tree lines on land, and a substantial of the Greenland ice sheet (Brigham-Grette 2009[ix]).
Blog edited by Sam Carana, with news on climate change and warming in the Arctic due to snow and ice loss and methane releases from the seafloor. Jan 13, 2016 · As the ice sheet retreated, the methane rich hydrates melted, releasing the climate gas into the ocean and atmosphere for millennia. This finding was published last week in Nature Communications in the paper "Ice-sheet-driven methane storage and release in the Arctic.". Jul 24, 2013 · Arctic Methane Release Could Cost Economy $60 Trillion. A release of methane in the Arctic could speed the melting of sea ice and climate change with a cost to the global economy of up to $60 ... The Kara Sea has only near-coastal submerged permafrost and has too shallow a gradient for gravity-driven landslides, so it too is zero risk, regardless of its potential for methane release by other mechanisms. Like the crater-pockmarked Barents, loss of a massive Pleistocene ice sheet greatly reduced pressure needed to sustain clathrates below. A summer with severe sea ice loss / very low #s, and methane release, is likely (IMO) the only way to get a major Greenland melt event well in excess of what we saw before and during 2012. Such a melt event (aggravated by release of methane) would be capable of releasing enough cold freshwater to resuscitate the halocline and seal the traps.
Mapped extent of the Laurentide Ice Sheet during deglaciation has been prepared by Dyke et al. Cycles of deglaciation are driven by various factors, with the main driver being changes in incoming summer solar radiation, or insolation, in the Northern Hemisphere. Methane release from pingo-like features across the South Kara Sea shelf, an area of thawing offshore permafrost. Journal of geophysical research: Earth surface, in review. Article 4: Alexey Portnov, Sunil Vadakkepulyambatta, Jürgen Mienert, Alun Hubbard. Ice-sheet driven methane storage and release in the Arctic. Submitted to Nature Geoscience. By analogy, the future response of Polar ice sheets is an emerging concern as their ongoing thinning and retreat will likewise perturb the present day subglacial GHSZ leading to potential widespread gas hydrate destabilisation and release. Portnov, Alexey, et al. "Ice-sheet-driven methane storage and release in the Arctic", Nature Comm. DOI: 10 ... Coastal Arctic climates are moderated by oceanic influences, having generally warmer temperatures and heavier snowfalls than the colder and drier interior areas. The Arctic is affected by current global warming, leading to Arctic sea ice shrinkage, diminished ice in the Greenland ice sheet, and Arctic methane release as the permafrost thaws. However, recent dating of methane expulsion sites suggests that gas release has been ongoing over many millennia. Here we synthesize observations of B1,900 ﬂuid escape features—pockmarks and active gas ﬂares—across a previously glaciated Arctic margin with ice-sheet thermomechanical and gas hydrate stability zone modelling.