Sentences with phrase «about methane clathrates»

On twitter when Gavin first responded saying «but there's no evidence for this» after I'd sent a link to a paper by Shakhova and Semiletov talking in some detail about methane clathrates at the ESAS and permafrost, I didn't grasp that their discussions were actually not proven.

Not exact matches

Has anyone commented that the past claims of «shallow hydrates» would imply the presence about 50x as much methane in the shallow sediments — compared to methane in water or air or sediment not in clathrate form?

No - one at NASA or any other reputable climatological source that I know about is saying that a massive release of clathrate - stored methane into the atmosphere is a serious risk we'll face any time soon.

For example, because the mass balance argument says nothing about absolute numbers or attribution it may be that we are also — for example — destroying carbon - fixing plankton, reducing the breaking of waves and hence mechanical mixing with the upper ocean, releasing methane in the tundra which was previously held by acid rain and which can now be converted to CO2, or it may be we are just seeing a deep current, a tiny bit warmer than usual because of the MWP, heating deep ocean clathrate so that methanophage bacteria can devour it and give off CO2.

Finally, while economics may be critical to your definition of «catastrophic» anthropogenic global warming, economics says nothing about the science underlying the projections of sea level rise, the physics of Arctic amplification, changes to albedo that lead to greater warming that may lead to significant releases of methane clathrate deposits, regional projections of reduce (or enhanced) precipitation, and so on.

http://earthobservatory.nasa.gov/IOTD/view.php?id=83672 http://www.nytimes.com/2014/05/13/science/earth/collapse-of-parts-of-west-antarctica-ice-sheet-has-begun-scientists-say.html It will add about 10 feet according to an interview with one of the scientists involved; but over a long time and fairly vague time frame, unless reinforcing processes (carbon release from melting permafrost, shallow ocean bottom warmingn in the form of methane from clathrates), a major reduction in earth's albedo from permafrost, net ice sheet, and total sea ice, continue to increasingly accelerate the process.

If we are going to talk about carbon feedbacks, we need to include clathrates and free methane capped by permafrost.

[13][citation needed] The methane in clathrates typically has a biogenic isotopic signature and highly variable δ13C (− 40 to − 100 ‰), with an approximate average of about − 65 ‰.

[5] One litre of fully saturated methane clathrate solid would therefore contain about 120 grams of methane (or around 169 litres of methane gas at 0 °C and 1 atm), [nb 1] or one cubic metre of methane clathrate releases about 160 cubic metres of gas.

Methane clathrates are once such possibility as the Arctic faster than just about anywhere else and more quickly then as permafrost warms up then volume increases of methane are to be expected but just how much of an increase is open to quMethane clathrates are once such possibility as the Arctic faster than just about anywhere else and more quickly then as permafrost warms up then volume increases of methane are to be expected but just how much of an increase is open to qumethane are to be expected but just how much of an increase is open to question.

C (or methane hydrates / clathrates, in case that isn't considered geologic)-RRB-, Halting all marine photosynthesis and letting respiration / decay continue at the same rate (it would actually decay over time as less organic C would be available) would result in an O2 decrease at a rate of about 0.011 % per year, but it could only fall at that rate for about 3 weeks, with a total O2 decrease of about 0.000675 % (relative to total O2, and not counting organic C burial, which wouldn't make a big difference); Halting all land photosynthesis and letting respirationd / decay proceed at the same rate would cause O2 to fall about 0.027 % per year for about 19 years, with a total drop of about 0.52 %.

There are worries about thawing permafrost methane and ocean - based methane (clathrates?).

I'll already asked you few months ago, about the sensitivity of methanes clathrates in Arctic zone.

My understanding is that the atmosphere warmed by about 6 degrees C from our current level, and that triggered increasing releases of methane from clathrates in a positive feedback fashion over thousands of years (or was it millions of years??).