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#osmotic

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💧🌏 Greg Cocks

New Explanation For Siberia’s Permafrost Craters
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news.agu.org/press-release/new <-- shared technical article
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doi.org/10.1029/2024GL108987 <-- shared paper
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"KEY POINTS
• Surface ice-melt water can migrate downward driven by the osmotic pressure associated with a cryopeg, a lens of salty water below
• Overpressure can cause the frozen soil to crack resulting in mechanical explosion.."
#permafrost #hydrates # Russia #YamalPeninsula #BatagaikaCrater #Siberia #climatechange #geomorphology #mechanism #process #climatechange #methane #thawing #frozen #soil #Yamal #Taymyr #cryopeg #ice #water #hydrology #infiltration #osmotic #pumping #explosion #greehousegas

schematics - Warming causes melting in the active layer, which expands deeper into the permafrost. Meltwater then enters the salty cryopeg through osmosis, causing the expansion of the cryopeg, which cracks the overlying permafrost. When those cracks reach the surface, the rapid decrease in pressure in the cryopeg damages the methane hydrates below and triggers a rapid physical explosion. Images not to scale.
maps and phot insets - Siberian permafrost craters
photo and graphics - (Top) The first observed crater in the permafrost, detected in 2014 in the Yamal Peninsula, Siberia. Source: National Geographic. (Centre) Schematic representation of proposed cryopeg inflation. (Below) 2D Streamlines illustrating flow of water from the surface into the cryopeg (The -axis is an axis of symmetry).
photo - Large craters in the tundra on Russia’s Yamal Peninsula are formed by a combination of warming and osmosis, according to new research in Geophysical Research Letters.
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