"Natural seepage of methane offshore the Arctic archipelago Svalbard has been occurring periodically for at least 2.7 million years. Major events of methane emissions happened at least twice during this period, according to a new study".
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- might like this.Feb 6, 2015
- Considering the atmospheric warming effect of methane is 20x greater than CO2, this could be a significant impact, and rather random in its release!Feb 6, 2015
+Nadja Kutz might like this.
Thanks Jim for the +Nadja this article is interesting. However to say that "I like it" is may be not really the right wording. It rather worries me.
I actually check back my google+ notifications rather irregularily and I am reading the posts here on rather seldom (its too many posts here for me). May be I should change the settings.
There are though two arguments in the posts which I found especially disconcerting. That is the assumption:
"This is a deep water gas hydrate system, which means that it is in permanently cold waters and under a lot of pressure. This pressure keeps the hydrates stable and the whole system is not vulnerable to global temperature changes. But under the stable hydrates there is gas that is not frozen. The amount of this gas may increase if hydrates melt at the base of this stability zone, or if gas from deeper in the sediments arrives into the system."
may be not quite right.
That is on one hand are the phase transitions of methane hydrates that well understood that one can assert that the high pressure at the bottom of the sea keeps it stable? May be but then may be not. That is what seems to be behind this assertion is that usually the densest water is at the bottom of the sea at 4 degrees Celcius and then you can look e.g. at this phase diagram
(where I am not sure how well actually these phases had been studied). But then if there is a lot of bubbling going on, then how well applicable is this diagram?
Another thing is their view of the tectonics:
"This means that there is something that activated and deactivated the emissions several times. Plaza Faverola´s paper gives a plausible explanation: It is the movement of the tectonic plates that influences the gas release. Vestnesa is not like California though, riddled with earthquakes because of the moving plates. The ridge is on a so-called passive margin."
That is I already said here:
- it may be the case that the tectonics are eventually more active than "passive". That is I was wondering wether a fault in that region couldn't be part of "a fault which is a break between the western europe/African plate and the Eurasian/Arabian plate)". That is if you look at this map:
you see that the tectonics along what seems to be the Ural http://en.wikipedia.org/wiki/Ural_Mountains
may be part of a (in the map nonexisting) "fault" which goes down to the Arabic fault. (i.e. the part between african and arabic plate). The map is from 2002 and I tried to find a more up-to-date image but the server at NASA seems currently down.Feb 7, 2015
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