Methane Monster’s Grumbling Goes Global: 570 Methane Plumes Discovered on Atlantic Ocean Sea Floor - from Robertscribbler.
Greenhouse gas concentrations spike — heating the atmosphere and the deep ocean after a period of glaciation during which vast stores of carbon accumulated. Massive volumes of this carbon lay dormant — trapped in frozen ground and in clathrates on the sea bed. As the ocean and airs warm, these carbon stores release causing a massive spike of additional greenhouse gasses to hit the atmosphere and setting off ever-more-rampant heating. The cycle continues until much of these carbon stores out-gas, pushing the Earth into a hothouse state.
Sound chillingly familiar?
What I’ve just described is the process that most scientists believe occurred during the worst mass extinction event in the geological past — the Permian Extinction. A hothouse event that killed 95% of life in the oceans and 70% of life on land. And what humans are now doing to the Earth’s airs and waters through CO2 and related greenhouse gas emissions may well be shockingly similar.
Unfortunately, the vast carbon store in the Arctic is not the only potential source of heating feedback carbon release. For around the world, upon and beneath the ocean sea bed, billions of tons of methane lay stored in clathrate structures. These stores are separate from the large carbon deposits in the Arctic. But they are no less dangerous.And the amount of methane in our atmosphere is increasing faster now... last year it was about 1825 ppb; now it's around 1836 ppb. Note the rate of increase was lower prior to 2011.
In 2012, Nature issued a study that found a store of clathrates composing billions of tons of methane was now destabilizing off the US East Coast. The study predicted large-scale releases in the multi-gigaton range from the southern region of the East Coast methane clathrate store due both to changes in the Gulf Stream circulation and to warming bottom waters — both impacts set off by human-caused climate change. The study was uncertain how fast such a release could occur, but noted that the eventual release was likely due to wide-scale clathrate degradation associated with ocean bottom warming.
|Source - Sam Caranas (Arctic News)|
Notation in blue is mine.