Re: methane trapping
From: Carsten Troelsgaard (carsten.troelsgaard_at_mail.dk)
Date: 06/17/04
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Date: Thu, 17 Jun 2004 21:32:30 +0200
"DAH" <dharder@bnl-dot-gov.no-spam.invalid> skrev i en meddelelse
news:40d19e5a$1_2@127.0.0.1...
snip
> one might argue
> convincingly, based upon the following data, that a least in the case
> of Siberia, the conditions might favor it.
>
> http://www,netl.doe.gov/scng/hydrate/
I tried your link, but it doesn't work. I've added a new one.
http://www.netl.doe.gov/scng/hydrate/about-hydrates/about_hydrates.htm
snip
> A high pressure environment is usually associated with clathrate
> trapping of methane--like in the sediments on the floor of the
> continental shelves, however, if permafrost forms a seal over a high
> pressure gas reservoir, it would seem plausible for methane to be
> forced interstitially into the permafrost ice.
Gashydrates are stable at a combination of temperature and pressure: Above
zero and under high oceanic pressure, or in arctic temperatures at shallow
depth.
snip
> particularly in Siberia. I hadn’t considered how much ‘new’ methane
> would be released by thawing the subarctic bogs. Interesting point.
I don't find that such a process will add to the pool of atmospheric
metane - if I get you right.
> I will not be ready to trivialize the effect which the methane
> released by the retreating permafrost will have on global warming,
> until I know what happens to the methane when it is released. Does
> the hydrologic cycle remove it from the atmosphere? Does aerosol
> transport it? Could it achieve appreciable concentration in the
> upper atmosphere?
>
> Can someone provide, or direct me to, specific information about the
> dynamics of methane in the atmosphere?
Unfortunately I seem to have erased my links. One of them described a
gigantic landslide on the Norwegian shelf reaching as far as the British
isles - presumably due to a release of instable gas-hydrates. As Aidan I
believe that the glacial lowstand/pressurerelief is a better candidate for
the process than melting of ice. And it may even add logic to a sudden rise
in late glacial temperatures.
More on arctic gas-hydrates
http://www.netl.doe.gov/scng/hydrate/conference_pdfs/JIP_Hunter_PrudhoeBay.pdf
And this German page has some additional links
http://www.gashydrate.de/index.html
Carsten
> Aidan,
> Yes, please, I would like to review the historical precedent which you
> mention--the Late Paleocene. Do you have a publication reference?
>
> DAH 6/17/04
>
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