Sentences with phrase «as gas hydrate»

Large amounts of methane are stored in seafloor sediments as gas hydrate, and as these melt the gas is released into the water column.

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.

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.

Prior to the 1970s, hydrates were thought of only as nuisances, because they can plug oil and gas pipelines in the field.

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.

The results indicate that, in contrast to UO2 (H2O) +, the protactinium hydroxide isomer, PaO (OH) 2 +, is produced as a gas - phase species close in energy to the hydrate isomer, PaO2 (H2O) +.

«Later, the sea ice gradually expanded from the very high Arctic before reaching, for the first time, what we now see as the boundary of the winter ice around 2.6 million years ago,» says Jochen Knies, who is also attached to CAGE, the Centre for Arctic Gas Hydrate, Environment and Climate at the University of Tromsø, the Arctic University of Norway.

As it melts, one cubic meter of gas hydrate will release 164 cubic meters of natural gas.

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.

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.

It is made up of aluminum, hydrated silicon compounds, and oxygen and can trap toxic gases and odors such as formaldehyde, ammonia, and carbon monoxide.

SeaYu Enterprises SeaYu Enterprises» Clean + Green line of odor - control products — including a product specifically made for small animals — are made from cane - sugar derivatives, a proprietary blend of botanical extracts, hydrated cellulose (a plant - based cleaning agent), purified water, and nitrogen gas as a natural propellant.

«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).

The shelf (ESAS) is also characterized by the location of over 80 % of the existing submarine permafrost, as well as of the bulk of shallow water gas hydrates.

There are a number of factors that control CH4 concentrations that are extermely poorly understood and are mostly ignored in the scenarios — the dependence on other gases (such as O3, and CO), the impact of increased temperatures and changes to precip on tropical and boreal wetland emissions, the existence (or not) of a significant methane hydrate source from permafrost or continental shelves, the climate impact on the atmopsheric chemistry of CH4.

As such, there is a diffusion gradient of dissolved CH4 between the top of gas hydrate and the seafloor.

A thermal pulse of more than 10 °C is still propagating down into the submerged sediment and may be decomposing gas hydrate as well as permafrost.

And the gas expanding and cooling as the gas expands could push up a mass of ice and reformed hydrates creating the typical «bump» in the seabed.

Those original 10 molecules of water (gas and liquid) would have been present as chemical hydrates, I've depicted them as rust above.

Schmidt & Shindell, 2003, Atmospheric composition, radiative forcing, and climate change as a consequence of a massive methane release from gas hydrates.

Shakhova and Semiletov have identified CH4 sources on the East Siberian Arctic Shelf (ESAS) as comprising hydrates (1,000 Gtonnes), gas (700 Gtonnes) and permafrost (500 Gtonnes).

Methane can also be stored in the seabed as methane gas or methane hydrates and then released as subsea permafrost thaws.

Hydrates should be seen as a seal blocking the flux of methane from underlying reservoirs, and not the total source of gas in themselves.

Methane hydrate in ocean seabed sediments is a potential source of methane (CH4) to the atmosphere, where CH4 has potential to act as a powerful greenhouse gas.

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).

As it happens, the extra heat travels into shallow seas along the continental shelf and, over time, the warming also spreads to the deep seabed, destabilizing methane hydrates and free gas trapped over millennia in the permafrost cap.

Moreover, as if discovering methane emissions from the deep seas of the Arctic isn't already of major concern, a recent study discovered immense amounts of methane locked under Antarctic ice: «They... calculated that the potential amount of methane hydrate and free methane gas beneath the Antarctic Ice Sheet could be up to 4 billion metric tons, a similar order of magnitude to some estimates made for Arctic permafrost.

However, if the temperature warms, or the pressure is reduced (for instance if local sea level decreases), the hydrate will break up and release the methane as gas which can bubble up through the ocean and enter the atmosphere.

The hydrates release gas as they warm.

The release of fossil geological methane, currently trapped as free gas, may therefore occur sooner than from hydrates associated with permafrost.

It is quite possible, therefore, that some of the venting gas observed on the ESAS could be fossil methane, previously trapped beneath the permafrost as free gas or gas hydrates, finding its way to the surface through a cryosphere cap that has been degrading over the past 10,000 years.

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

Warming destabilises permafrost and marine sediments of methane gas hydrates in some regions according to some model simulations (Denman et al., 2007 Section 7.4.1.2), as has been proposed as an explanation for the rapid warming that occurred during the Palaeocene / Eocene thermal maximum (Dickens, 2001; Archer and Buffett, 2005).

What this exciting new research vessel will allow us to learn about seafloor spreading, earthquakes, magma flow, gas hydrate deposits, continental drift, and more, will expand scientific knowledge about the Earth and contribute to our ability as humans to withstand its extreme forces.

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.

The research to be conducted by Georgia Tech will advance the understanding of the behavior of gas hydrates hosted in fine - grained sediments such as clay or silt, and will evaluate extraction methods relevant to the potential to produce gas from such sediments.

There is some more information about permafrost and gas hydrates as a source of methane here and here: https://earthobservatory.nasa.gov/Features/MethaneMatters/#page5 https://earthobservatory.nasa.gov/Features/MethaneMatters/#page6

In addition, deep fresh water lakes may host gas hydrates as well, e.g. the fresh water Lake Baikal, Siberia.

The sedimentary methane hydrate reservoir probably contains 2 — 10 times the currently known reserves of conventional natural gas, as of 2013 [update].

The commentary speculates methane hydrates, ice - like substances where the gas is stored in the East Siberian Arctic shelf (among other places), could unleash a 50 gigatonne «pulse» of methane between 2015 - 2025 (leading to an atmospheric concentration six times current levels) as undersea permafrost thaws.

I suspect that the methane that has out - gassed from the hydrates changes to CO2 in the atmosphere before it returns to the Earth as stored carbon.

The visible hydrate was found as thin icelike layers that released methane gas initially upon retrieval, but stabilized for up to 4 h at atmospheric pressure conditions and subfreezing temperatures.

High methane concentrations in well - ice - bonded sediments and gas releases suggest that pore - space hydrate may be found at depths as shallow as 119 m. Geochemical and isotopic determinations suggest that the methane hydrate observed in the core hole is biogenic (microbial) in origin.

Schmidt, G.A., and D.T. Shindell, 2003: Atmospheric composition, radiative forcing, and climate change as a consequence of a massive methane release from gas hydrates.

The ice sheet provides perfect conditions for subglacial gas hydrate formation, in the past as well as today.