Sentences with phrase «gas hydrates in»

1982 Richard D. McIver, «Role of Naturally Occurring Gas Hydrates in Sediment Transport.»

Ohio State University will conduct research in collaboration with the Bureau of Ocean Energy Management to increase our understanding of the occurrence, volume and distribution of natural gas hydrates in the northern Gulf of Mexico using more than 1,700 petroleum industry well logs that penetrate the gas hydrate stability zone, or the offshore depths and locations where gas hydrates flourish.

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).

# 33 — Gavin, one of the papers cited by Shakhova is Gas and Possible Gas Hydrates in the Permafrost of Bovanenkovo Gas Field, Yamal Peninsula, West Siberia by Evgeny M.Chuvilin, Vladimir S.Yakushev and Elena V.Perlova, Polarforschung 68: 215 — 219, 1998 (erschienen 2000) shows marine hydrates at depths of 60m to 120m.

For their study, the team had investigated the history of gas hydrates in the Nyegga area.

More serious for the rest of the world is the possibility that gas hydrates in permafrost are more vulnerable to thawing than was thought.

Tim Collett, USGS senior scientist, said: «The discovery of what we believe to be several of the largest and most concentrated gas hydrate accumulations yet found in the world will yield the geologic and engineering data needed to better understand the geologic controls on the occurrence of gas hydrate in nature and to assess the technologies needed to safely produce gas hydrates.»

Not exact matches

At scale, the process would hydrate the CO2 in power plant flue gas with water to produce a carbonic acid solution.

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.

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).

Gas hydrates naturally form along the coasts of continents and in Arctic permafrost, places where water and gas mix at relatively high pressure and low temperatuGas hydrates naturally form along the coasts of continents and in Arctic permafrost, places where water and gas mix at relatively high pressure and low temperatugas mix at relatively high pressure and low temperature.

Thomsen and his colleagues have discovered that changes in ocean currents triggered by storms raging on the sea surface can alter the release of gas from the hydrate mounds.

Far more is locked away in frozen deposits called methane gas hydrates.

«If the decomposition of the methane hydrate phase is fast enough, which depends on temperature, the methane gas in the aqueous phase forms nanobubbles,» said Saman Alavi, one of the lead researchers on the project.

Gas hydrates — a mixture of ice and methane — are found only in high - pressure and cold temperatures.

Hydrates are a currently untapped source of natural gas, one of the chief energy sources in the United States.

«The gas hydrate pingos in permafrost are formed because of the low temperatures.

Naturally - occurring methane hydrates, hidden deep under the sea floor or tucked under Arctic permafrost, contain substantial natural gas reserves locked up in a form that is difficult to extract.

They are associated with temporal changes in dissociation of gas hydrates - the icy substance that contains huge amounts of methane.

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

In many parts of the world, the seafloor contains natural gas trapped inside ice crystals called hydrates.

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.

One hypothesis for the slide was that an earthquake caused the methane hydrates in the region to become unstable and to explosively release their gas.

The methane in gas hydrates must come either from methane - producing bacteria living in the permafrost, or from the breakdown of organic matter in deeper sediments.

Permafrost was known to contain gas hydrates — icelike mixtures of water and organic gases first identified in deep - sea sediments which form only at very high pressures and low temperatures.

Under most frozen hydrate deposits is a layer of free methane gas occupying the pore spaces in the sediment.

Interest in hydrates has skyrocketed in recent years because global deposits are thought to harbor more fuel energy than all the world's coal, oil and natural gas reserves combined.

«You build up too much free gas, and then you have an overpressured column,» says Gerald Dickens, a marine geochemist at Rice University who went to Hydrate Ridge on a drill ship in 2002.

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) +.

The gas - phase results are consistent with the spontaneous hydrolysis of PaO2 + in aqueous solution, this in contrast to heavier actinide dioxides of uranium, neptunium, and plutonium; the heavier actinide dioxides form stable hydrates in both solution and gas phase.

Two years ago, in a kind of crater off the Democratic Republic of the Congo, 10,000 feet down, a team led by Myriam Sibuet of the French Research Institute for Ocean Exploitation, discovered a spectacular cold seep with a vast field of clams and mussels, blue shrimp, purple sea cucumbers, and six - foot - long tube worms growing in bushes next to mounds of gas hydrate.

«We should see gas hydrate becoming a meaningful and environmentally friendly resource in the next century,» Sassen says.

Given the vastness of the world's marine methane hydrate deposits — more than twice the carbon reserves of all other fossil fuels combined — it's not surprising that government agencies and the petroleum and natural gas industries have long been interested in harvesting this new energy supply.

Suess now attributes this buoyancy, not a typical hydrate characteristic, to large bubbles of gas that accumulate in the top layers of the seafloor ooze before freezing.

Suction in the system reduced the pressure in the gas hydrate, causing the ice to melt and liberate its gases.

In March, Japan became the first country to successfully extract methane from frozen undersea deposits called gas hydrates.

A team of researchers from the GEOMAR Helmholtz Centre for Ocean Research Kiel together with colleagues from Bergen, Oslo and Tromsø (Norway), have now discovered that large - scale sedimentation caused by melting of glaciers in a region off Norway has played a greater role in gas hydrate dissociation than warming ocean waters.

In a computer model, the team used the available data to simulate the evolution of the seabed and the response of the gas hydrates during this period.

The numerical simulations of the seafloor also showed that the pockmarks in Nyegga are likely associated with this phenomenon because they are located right in the area of the largest gas hydrate dissociation event at the end of the Ice Age.

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.

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.

Tapping into thawing permafrost for methane — which does not necessarily mean methane hydrates — would also present similar risks in producing conventional natural gas.

Our results stress the importance of external climatic forcing of the dynamics of the seafloor, and the role of the rapid warming following the Younger Dryas in pacing the marine gas hydrate reservoir.

Based on pressure and temperature modelling, we show that the last deglaciation could have triggered dissociation of gas hydrates present in the region of the northern part of the Norwegian Channel, causing degassing of 0.26 MtCH4 / km2 at the seafloor.

They are associated with temporal changes in dissociation of gas hydrates — the icy substance that contains huge amounts of methane.

Gas clathrate hydrates are ice - like solids, in which gas molecules or atoms are trapped inside crystalline frameworks formed by water moleculGas clathrate hydrates are ice - like solids, in which gas molecules or atoms are trapped inside crystalline frameworks formed by water moleculgas molecules or atoms are trapped inside crystalline frameworks formed by water molecules.

Umbertoluca Ranieri, PhD student at ILL and EPFL, and lead author of this study says: «These results are important in improving our understanding of many fundamental non-equilibrium phenomena involving methane clathrate hydrates; for example, the replacement kinetics during gas exchange in case of conversion between the clathrate structures I and II.

In the greater NZ region, we have undersea hot springs (hydrothermal vents of the Kermadecs), marine hydrocarbon seeps and gas hydrates (offshore eastern North Island — possible analogues for oceans on Icy Worlds), and terrestrial (on land) hot springs in the Taupo Volcanic Zone and elsewhere around the countrIn the greater NZ region, we have undersea hot springs (hydrothermal vents of the Kermadecs), marine hydrocarbon seeps and gas hydrates (offshore eastern North Island — possible analogues for oceans on Icy Worlds), and terrestrial (on land) hot springs in the Taupo Volcanic Zone and elsewhere around the countrin the Taupo Volcanic Zone and elsewhere around the country.

She heads the gas hydrates program at a U.S. Geological Survey field center in Woods Hole, Mass., and was not involved in the new work.

Carozza et al (2011) find that natural global warming occurred in 2 stages: First, global warming of 3 ° to 9 ° C accompanied by a large bolus of organic carbon released to the atmosphere through the burning of terrestrial biomass (Kurtz et al, 2003) over approximately a 50 - year period; second, a catastrophic release of methane hydrate from sediment, followed by the oxidation of a part of this methane gas in the water column and the escape of the remaining CH4 to the atmosphere over a 50 - year period.