Sentences with phrase «ocean gas hydrates»

Reference: Serov, P., et.al., Postglacial response of Arctic Ocean gas hydrates to climatic amelioration.

Not exact matches

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).

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.

One cubic meter of gas hydrate on the ocean floor contains 165 cubic meters of gas at room temperature and pressure.

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.

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.

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.

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 waOcean 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 waocean waters.

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.

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.

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 country.

Rising Arctic Ocean temperatures cause gas hydrate destabilization and ocean acidificaOcean temperatures cause gas hydrate destabilization and ocean acidificaocean acidification.

A recent interpretive review of scientific literature performed by researchers at the U.S. Geological Survey and here at Rochester pays particular attention to gas hydrates beneath the Arctic Ocean.

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

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.

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

«This yields an estimated ∼ 1,600 Pg C within gas hydrates associated with subsea permafrost on the Arctic Ocean continental shelves.»

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.

The methane release happens because the gas is freed from melting hydrates — an icy substance found below the ocean floor, containing methane in a cage of frozen water.

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).

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.

1 Positive 1.1 Carbon cycle feedbacks 1.1.1 Arctic methane release 1.1.1.1 Methane release from melting permafrost peat bogs 1.1.1.2 Methane release from hydrates 1.1.2 Abrupt increases in atmospheric methane 1.1.3 Decomposition 1.1.4 Peat decomposition 1.1.5 Rainforest drying 1.1.6 Forest fires 1.1.7 Desertification 1.1.8 CO2 in the oceans 1.1.9 Modelling results 1.1.9.1 Implications for climate policy 1.2 Cloud feedback 1.3 Gas release 1.4 Ice - albedo feedback 1.5 Water vapor feedback 2 Negative 2.1 Carbon cycle 2.1.1 Le Chatelier's principle 2.1.2 Chemical weathering 2.1.3 Net Primary Productivity 2.2 Lapse rate 2.3 Blackbody radiation

Released from the pressures of the ocean depths, methane hydrate expands to create huge volumes of methane gas, one of the most powerful of the greenhouse gases.

Researchers from the Centre for Arctic Gas Hydrate, Environment and Climate (CAGE) at the Arctic University of Norway have discovered a growing Arctic abiotic methane - and methane hydrate — charged sediment drift on oceanic crust in the deep Fram Strait of the ArcticHydrate, Environment and Climate (CAGE) at the Arctic University of Norway have discovered a growing Arctic abiotic methane - and methane hydrate — charged sediment drift on oceanic crust in the deep Fram Strait of the Arctichydrate — charged sediment drift on oceanic crust in the deep Fram Strait of the Arctic Ocean.

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.

Knowledge of the timescales of gas hydrate dissociation and subsequent methane release are critical in understanding the impact of marine gas hydrates on the ocean — atmosphere system, says Shyam Chand, researcher at NGU / CAGE.

If the ice sheets retreat the weight of the ice will be lifted from the ocean floor, the gas hydrates will be destabilised and the methane will be released.

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.

The project at the University of Texas at Austin will develop conceptual and numerical models to analyze conditions under which gas will be expelled from existing marine accumulations of gas hydrate into the ocean, which could potentially have a damaging effect to the ecosystem.

The USGS, which announced the discovery, estimates there is about 700,000 tcf of gas hydrate worldwide, most of it below the ocean floors, where hydrates form under high pressure and cold temperatures.

Methane hydrates are 3D ice - lattice structures with natural gas locked inside, and are found both onshore and offshore — including under the Arctic permafrost and in ocean sediments along nearly every continental shelf in the world.

Scientists from the Center for Arctic Gas Hydrate (CAGE), Environment and Climate at the Arctic University of Norway, published a study in June 2017, describing over a hundred ocean sediment craters, some 3,000 meters wide and up to 300 meters deep, formed due to explosive eruptions, attributed to destabilizing methane hydrates, following ice - sheet retreat during the last glacial period, around 12,000 years ago, a few centuries after the Bølling - Allerød warming.

Gas hydrate pingos, have been discovered in the Arctic oceans Barents sea.

If mass flow is more important than previously assumed, if gas driven pumping through the hydrates is greater than previously assumed, or if high salt hydrates at equilibrium with ocean temperatures are common, these things could also increase the rate of dissociation.

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.

Here in Oregon we are the somewhat unwitting hosts of a great deal of methane hydrate research by Oregon State University, some Texas university people (and backing by the good old Houston - based gas industry), of deposits on and near the ocean floor on the Gorda Ridge just off our coast, which is a consequence of the subduction zone geomorphology of the area.

Brewer, P.G., C. Paull, E.T. Peltzer, W. Ussler, G. Rehder, and G. Friederich, Measurements of the fate of gas hydrates during transit through the ocean water column, Geophysical Research Letters, 29 (22), 2002.

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