Sentences with phrase «ocean methane hydrate»

In summary, the ocean methane hydrate pool has strong potential to amplify the human CO2 release from fossil fuel combustion over times scales of decades to centuries.

There also vast amounts of CO2 associated with ocean methane hydrate deposits.

Dr. Archer has worked on the ongoing mystery of the low atmospheric CO2 concentration during glacial time 20,000 years ago, and on the fate of fossil fuel CO2 on geologic time scales in the future, and its impact on future ice age cycles, ocean methane hydrate decomposition, and coral reefs.

I just go to the section where they get into discussing Arctic seabed methane in more detail, and the conclusion of that section is actually: «In summary, the ocean methane hydrate pool has strong potential to amplify the human CO2 release from fossil fuel combustion over time scales of decades to centuries.»

and the examples that he thinks have the potential to be large scale tipping elements are: Arctic sea - ice, a reorganisation of the Atlantic thermohaline circulation, melt of the Greenland or West Antarctic Ice Sheets, dieback of the Amazon rainforest, a greening of the Sahara, Indian summer monsoon collapse, boreal forest dieback and ocean methane hydrates.

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And will this mean that methane will not be released from deep ocean methane hydrates?

and the examples that he thinks have the potential to be large scale tipping elements are: Arctic sea - ice, a reorganisation of the Atlantic thermohaline circulation, melt of the Greenland or West Antarctic Ice Sheets, dieback of the Amazon rainforest, a greening of the Sahara, Indian summer monsoon collapse, boreal forest dieback and ocean methane hydrates.

Not exact matches

The race is on to tap the world's biggest and most unusual fossil fuel supply — methane trapped in frozen hydrates in permafrost and at the bottom of the ocean

Gas hydrates, icelike deposits of methane locked away in permafrost and buried at the ocean bottom, may pose a threat to our climate (see Discover, March 2004).

The Arctic ocean floor hosts vast amounts of methane trapped as hydrates, which are ice - like, solid mixtures of gas and water.These hydrates are stable under high pressure and cold temperatures.

A crew of a dozen sailors, a geophysics professor, and two graduate students, we were combing the ocean floor for buried methane hydrate, an ice - like form of natural gas estimated to be more abundant than fossil fuels.

Gargantuan stores of gas hydrates under the oceans and permafrost regions of the globe have many scientists wondering whether they can find an economically feasible way to unlock the methane, creating a natural gas supply that could last for centuries.

Release of methane hydrates has previously been suggested as a mechanism to drive runaway greenhouse events, as warming oceans releases trapped methane that causes further warming and releases more methane.

Similar frozen methane hydrates occur throughout the same arctic region as they did in the past, and warming of the ocean and release of this methane is of key concern as methane is 20x the impact of CO2 as a greenhouse gas.

Methane hydrates were later found in permafrost in the 1960s, and in the oceans, commonly on the edges of the continental shelves, but only at certain ocean pressures and temperatures.

Scientists excavating the ocean floor have found huge chunks of frozen methane along Hydrate Ridge, about 60 miles off the coast of Oregon.

We suggest that a vigorous deepwater bacterial bloom respired nearly all the released methane within this time, and that by analogy, large - scale releases of methane from hydrate in the deep ocean are likely to be met by a similarly rapid methanotrophic response.

In some parts of the Arctic Ocean, the shallow regions near continents may be one of the settings where methane hydrates are breaking down now due to warming processes over the past 15,000 years.

Trapped in ocean sediments near continents lie ancient reservoirs of methane called methane hydrates.

Exponentially less methane would be able to reach the atmosphere in waters that are thousands of feet deep at the very edge of the shallow seas near continents, which is the area of the ocean where the bulk of methane hydrates are,» Sparrow says.

Methane hydrates, also known as «burning ice», occur at all ocean margins.

If the pressure is too low or the temperature too high, the hydrates dissociate (break down), the methane is released and the gas can seep from the seafloor into the ocean.

The methane hydrates with the highest climate susceptibility are in upper continental margin slopes, like those that ring the Arctic Ocean, representing about 3.5 percent of the global methane hydrate inventory, says Carolyn Ruppel, a scientist who leads the Gas Hydrates Project at thydrates with the highest climate susceptibility are in upper continental margin slopes, like those that ring the Arctic Ocean, representing about 3.5 percent of the global methane hydrate inventory, says Carolyn Ruppel, a scientist who leads the Gas Hydrates Project at tHydrates Project at the USGS.

Methane hydrates, after all, were largely responsible for corrupting the containment dome intended to stop the 2010 Deepwater Horizon oil spill rising from the ocean bottom; the viscous mixture clogged the dome and a redirection pipe intended to take leaking oil to a tanker waiting above.

Most methane hydrates are buried in ocean water so deep that the journey through the water column is too far for the gas to ever reach the atmosphere, according to Ed Dlugokencky, a researcher at the National Oceanic and Atmospheric Administration.

Some of the methane hydrates in the Arctic and upper continental slopes such as the northern Pacific Ocean are beginning to thaw as temperatures rise.

Even where methane increases are observed at the ocean surface, scientists need better data to determine whether emissions come from hydrates or other seafloor sources.

Beyond that, more than 95 percent of the world's methane hydrates exist in deep - ocean settings where it is unlikely water would ever heat up enough to significantly destabilize them.

Worldwide, particularly in deeply buried permafrost and in high - latitude ocean sediments where pressures are high and temperatures are below freezing, icy deposits called hydrates hold immense amounts of methane (SN: 6/25/05, p. 410).

Van Nieuwenhuise noted that today's warming oceans could also cause hydrates on the ocean floor to release methane, which may exacerbate climate change.

I'd love to know what they did take into account in attempting to model that period — must include astronomical location, sun's behavior, best estimates about a lot of different conditions — where the continents were, what the ocean circulation was doing, whether there had been a recent geological period that laid down a lot of methane hydrates available to be tipped by Pliocene warming into bubbling out rapidly.

My research indicates that the Siberian peat moss, Arctic tundra, and methal hydrates (frozen methane at the bottom of the ocean) all have an excellent chance of melting and releasing their stored co2.Recent methane concentration figures also hit the news last week, and methane has increased after a long time being steady.The forests of north america are drying out and are very susceptible to massive insect infestations and wildfires, and the massive die offs - 25 % of total forests, have begun.And, the most recent stories on the Amazon forecast that with the change in rainfall patterns one third of the Amazon will dry and turn to grassland, thereby creating a domino cascade effect for the rest of the Amazon.With co2 levels risng faster now that the oceans have reached carrying capacity, the oceans having become also more acidic, and the looming threat of a North Atlanic current shutdown (note the recent terrible news on salinity upwelling levels off Greenland,) and the change in cold water upwellings, leading to far less biomass for the fish to feed upon, all lead to the conclusion we may not have to worry about NASA completing its inventory of near earth objects greater than 140 meters across by 2026 (Recent Benjamin Dean astronomy lecture here in San Francisco).

Methane hydrate is potentially susceptible to ocean warming, which could trigger a positive feedback resulting in rapid climate warming.

When I read it I had in mind the frozen methane hydrates at the bottom of the ocean (from «biologic processes»).

Here, we report on advances made in methane hydrate research and deep - ocean Raman spectroscopy, and on proposals for fossil fuel CO2 sequestration and on controlled ocean acidification studies.

However, the stark reality is that global emissions have accelerated (Fig. 1) and new efforts are underway to massively expand fossil fuel extraction [7]--[9] by drilling to increasing ocean depths and into the Arctic, squeezing oil from tar sands and tar shale, hydro - fracking to expand extraction of natural gas, developing exploitation of methane hydrates, and mining of coal via mountaintop removal and mechanized long - wall mining.

The required additional fossil fuels will involve exploitation of tar sands, tar shale, hydrofracking for oil and gas, coal mining, drilling in the Arctic, Amazon, deep ocean, and other remote regions, and possibly exploitation of methane hydrates.

Contribution of oceanic gas hydrate dissociation to the formation of Arctic Ocean methane plumes

Recent studies have therefore preferred mechanismsthat require a climatological trigger for carbon injection, for example through enhance - 5 ment of seasonal extremes that caused changes in ocean circulation, which in turncould dissociate submarine methane hydrates (Lunt et al., 2011).

It takes a long time to warm the deep ocean and the clathrate zone, and no one has proposed a mechanism for getting much methane release from hydrates in the coming century.

The non linear nature of forcing is related more to positive feedbacks and changes that are still being studied, such as cyclic changes in moisture content and regional dispersion, the methane cycles in the ocean or the potential of methane clathrate / hydrate release, and of course the race to feed more people on a planet which will inevitably add more nitrous oxide to the atmosphere and create more dead zones in the oceans, droughts, floods, fires, dogs and cats living together, mass hysteria....

Generally, there are indications that if we reach 4 to 6C rise there is a chance possibly for larger methane hydrate release once the oceans warm up.

And / or it could come from nature emitting GHGs as a response to the warming and its many effects (right now I'm thinking wildfires, but there's also methane from melting permafrost & ocean hydrates).

An increased concentration of methane release, Gustafsson suspects, may be coming from collapsing «methane hydrates» — pockets of the gas that were once trapped in frozen water on the ocean floor.

Ocean oxygen depletion due to decomposition of submarine methane hydrate Akitomo Yamamoto1, 2, *, Yasuhiro Yamanaka2, Akira Oka1 andAyako Abe - Ouchi1 Article first published online: 21 JUL 2014 DOI: 10.1002 / 2014GL060483

The exceptions are hydrate in permafrost soils, especially those coastal areas, and in shallow ocean sediments where methane gas is focused by subsurface migration.»

And, with ocean warming, what will hapen with the oceanic clathrats (methane hydrates)?

Possible run - away greenhouse due to such things as release of the methane clathrate (hydrate) on the ocean floors;

Meanwhile, shale gas «fracking» and the potential recovery of methane hydrates from the ocean floor demonstrate that there is a great deal of R&D left to do in the fossil fuel sector.