Sentences with phrase «as methane hydrates»

Stocks Under conditions of high pressure, high methane concentration, and low temperature, water and methane can combine to form icy solids known as methane hydrates or clathrates in ocean sediments.

If you're wondering whether carbon dioxide hydrates could be as treacherous as methane hydrates, I should pass on Stott's warning that the mechanisms involved are different.

It is not yet clear whether this gas is present below the permafrost as free gas or as methane hydrates or both.

Another vast source of methane is in icy deposits known as methane hydrates, often in sediments deep under the world's oceans.

Portnov studies the remnants of methane hydrates exposed at the end of the last ice age in the Arctic, as well as methane hydrates currently thawing out of Arctic permafrost today.

But researchers such as Natalia Shakhova — a visiting scientist at the University of Alaska in Fairbanks and a participant in some of the Siberian Shelf scientific cruises — are concerned that the undersea permafrost layer has become unstable and is leaking methane long locked in ice crystals, known as methane hydrates.

These look to be sufficient to supply energy for hundreds of years — even without accessing even more «unconventional» sources such as methane hydrates.

This issue has quickly risen because Japan conducted its second production test of these deposits, known as methane hydrates, in May.

The timing is coincident with a period of global warming, and Williscroft and colleagues suggest that it was this warming that released methane frozen as methane hydrates in the sea floor, as a relatively sudden methane «burp.»

The most likely explanation is the mass release of methane from sediments on the sea floor, where the gas was sequestered, as it is now, in a solid form as methane hydrate.

What is concerning is the possibility that rapid global warming could occur faster than many people believe is possible, if global warming due to atmospheric carbon dioxide causes the Earth's atmosphere to warm enough to release enormous deposits of frozen methane (CH4) that are stored in the permafrost above the Arctic Circle and in frozen methane ice, known as methane hydrate, underneath the floors of the oceans throughout the world (see: How Methane Gas Releases Due To Global Warming Could Cause Human Extinction).

The expedition started from the well - established fact that an enormous amount of methane is frozen into a kind of ice known as methane hydrate, buried in seafloor sediments and containing perhaps twice as much carbon as all the world's fossil - fuel reserves combined.

To forestall end runs by the EPA, wording could be included to exclude precursors such as methane hydrate.

The offshore methane is typically locked up as methane hydrate or clathrate, essentially a type of ice that is only stable at certain combinations of temperature and pressure.

Not exact matches

The U.S. Geological Survey estimates that methane locked in ice (known as hydrates) could contain more organic carbon than all the world's coal, oil, and nonhydrate natural gas combined.

Under the ice sheet the methane became stored as hydrate, a solid form of frozen methane.

Taken together, they also provide a potential explanation for the so - called memory effect — the fact that «aqueous solutions in contact with methane form solid methane hydrate at a much faster rate if they have already undergone a methane hydrate formation - decomposition cycle,» said Alavi, almost as if the hydrate «remembers» its previous state.

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.

Potentially catastrophic amounts of methane lie trapped as so - called burning ices, or methane hydrates, in the permafrost beneath arctic tundra — as much as 10,000,000 teragrams still trapped compared with just 5,000 teragrams in the atmosphere today, according to Simpson.

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.

But mining methane hydrates as an energy source, an option that is being explored by Japan among others, is technically difficult.

There is so much methane that, as it freezes instantaneously to form hydrate, it draws all the water out of the seafloor ooze and dries it out completely — and often there is methane left over, trapped as large bubbles in the porous hydrate.

The hydrate is extremely unstable; as it gets buried deeper by fresh sediment falling on the seafloor above, it warms enough to release its methane again.

Over the years, as researchers have returned to the place they named Hydrate Ridge, they have learned a lot about how methane hydrate is createdHydrate Ridge, they have learned a lot about how methane hydrate is createdhydrate is created there.

As it approaches the seafloor, it chills, and in many places it freezes, together with water in the mud, into solid methane hydrate (white).

Although not many researchers are as concerned as he is, there is evidence that methane escaping from hydrates might have affected climate a lot more recently than the Permian.

The probe from DeLong and Hinrichs, on the other hand, had worked right away: The Hydrate Ridge sediments were loaded with their methane eater, which is not a bacterium at all but a species of Archaea, an ancient group of microbes that diverged from bacteria billions of years ago and are as distinct from them now, genetically speaking, as humans are.

Previous work has estimated that more than a trillion tonnes of methane lie under the shelf, trapped inside lattices of ice known as hydrates, at depths as shallow as 20 metres.

«Our data suggest that even if increasing amounts of methane are released from degrading hydrates as climate change proceeds, catastrophic emission to the atmosphere is not an inherent outcome.»

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

They found methane fluxes, but not as high as the Shakhova study, and they could not attribute what they found directly to methane hydrates.

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.

As countries produce more conventional and unconventional fuels, the planet is warming in areas where methane hydrates exist.

But that study said it is uncertain how much hydrates contribute to the methane emissions, as opposed to other sources such as the decomposition of organic matter in permafrost as it thaws.

He sees the same fundamental problem with permafrost as with methane hydrates - the likely amount of available carbon falls short of that needed by a factor of two or three.

Once formed by either serpentinization or microbes, methane could be stored as a stable clathrate hydrate — a chemical structure that traps methane molecules like animals in a cage — for later release to the atmosphere, perhaps by gradual outgassing through cracks and fissures or by episodic bursts triggered by volcanism.

Once produced, methane could have been stored as a stable clathrate hydrate and released to the atmosphere either gradually, through volcanism, or in bursts, triggered by impacts.

Methane is a crouching tiger in the carbon cycle, with potentially enough available as hydrates and from peats to really clobber the Earth's heat budget.

A release of 500 Gton C as methane (order 10 % of the hydrate reservoir) to the atmosphere would have an equivalent radiative impact to a factor of 10 increase in atmospheric CO2...........

There are enough fossil fuel reserves (in oil, coal, and methane hydrates) to continue to increase CO2 way beyond 400ppmv as will be seen in a very few number of years.

And finally, what about Mark's questions (# 3) and other factors not discussed here — do all these effects re Arctic ice lead scientists to believe there is a greater and / or earlier chance (assuming we continue increasing our GHG emissions — business as usual) of melting hydrates and permafrost releasing vast stores of methane into the atmosphere than scientists believed before the study, or is the assessment of this about the same, or scientists are not sure if this study indicates a greater / lesser / same chance of this?

Yet governments and industry are rushing into expanded use of fossil fuels, including unconventional fossil fuels such as tar sands, tar shale, shale gas extracted by hydrofracking, and methane hydrates.

The alternative pathway, which the world seems to be on now, is continued extraction of all fossil fuels, including development of unconventional fossil fuels such as tar sands, tar shale, hydrofracking to extract oil and gas, and exploitation of methane hydrates.

Methane is a crouching tiger in the carbon cycle, with potentially enough available as hydrates and from peats to really clobber the Earth's heat budget.

«Methane hydrate seems menacing as a source of gas» another emotive term is «menacing».

Methane hydrate seems menacing as a source of gas that can spring aggressively from the solid phase like pop rocks (carbonated candies).

As you might expect, the hypothesis that methane hydrates was a contributor to the PETM has been kicking around for a while.

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?

(Methane hydrate can be found close to the sediment surface in deeper water depth settings, as for example in the Gulf of Mexico or the Nankai trough).