Sentences with phrase «of ocean methane»

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«Researchers establish long - sought source of ocean methane: An abundant enzyme in marine microbes may be responsible for production of the greenhouse gas.»

Several years ago, van der Donk and University of Illinois colleague William Metcalf found a possible clue to the mystery of ocean methane: They discovered a microbial enzyme that produces a compound called methylphosphonate, which can become methane when a phosphate molecule is cleaved from it.

Not exact matches

«Greenhouse gas emissions are going to go through the roof with a project of this kind,» said Wilderness Committee National Campaign Director Joe Foy «From escaped methane at the drill sites to the massive carbon emissions required to cool the gas, to more escaped methane on the long trip across the ocean to Asia and then the emissions from burning the gas.

I vaguely collect reading that there was a lot of methane on the ocean floor (as methane clathrate), plus occasional pockets of oil (through accumulation of perished marine life).

There's enough vinyl cyanide (C2H3CN) in the moon's liquid methane seas to make about 10 million cell - like balls per cubic centimeter of ocean, researchers calculate.

Thus, methane and carbon dioxide together, unaccompanied by carbon monoxide, on a rocky, ocean - bearing world would best be interpreted as an airtight sign of anoxic life.

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

In the process, they might identify a planet's surface features — such as oceans, continents, ice caps and even cloudbanks — and detect the presence of biomarkers like oxygen, methane and water.

«Researchers build alien ocean to test NASA outer space submarine: Working in a -300 F ocean of methane and ethane has its challenges.»

The engineering is even trickier because, unlike the nearly homogeneous water in earth - based oceans, the concentration of ethane and methane can vary dramatically in the Titan oceans and change the liquid's density properties.

«Although most of the macrophyte carbon is released back to the atmosphere in the same form that it is assimilated, carbon dioxide, some of it is actually exported to the ocean as dissolved carbon or released to the atmosphere as methane, a gas that has a warming potential 20 times larger than carbon dioxide,» said John Melack, a professor at the University of California, Santa Barbara.

Ryskin proposes that huge deposits of methane and other gases, which are naturally produced in deep - sea waters, became trapped under the pressure of a then - stagnant global 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).

Through them we have learned of lava plains on Venus, a buried ocean on Jupiter's moon Europa, lakes of methane on Saturn's moon Titan, and salty geysers on another Saturnian moon, Enceladus.

This is actually one of the most active methane seep sites that we have mapped in the Arctic Ocean.

500m wide and 10m high, the methane domes on the Arctic Ocean floor are containing huge amounts of methane.

Warmer oceans are thawing methane deposits, adding more of the greenhouse gas to the atmosphere

A possible explanation is that the build - up of methane below the ocean floor creates bubbles.

The resulting outburst of methane produced effects similar to those predicted by current models of global climate change: a sudden, extreme rise in temperatures, combined with acidification of the oceans.

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.

The extensive methane seep mounds across the remote arctic island of Ellef Ringnes may be a caution from the past regarding potential impacts of modern warming of the Arctic Ocean.

Because they form by leakage of methane into seawater it implies that something at that time caused a large release of methane into the ocean.

Bowen says the two relatively rapid carbon releases (about 1,500 years each) are more consistent with warming oceans or an undersea landslide triggering the melting of frozen methane on the seafloor and large emissions to the atmosphere, where it became carbon dioxide within decades.

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.

Even short - lived atmospheric greenhouse gases, like methane, leave an imprint in the oceans that can last centuries, according to a paper published in the Proceedings of the National Academy of Sciences in January.

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.

That may in turn have caused the planet to heat up enough to melt deposits of methane frozen in sediments on the ocean floor (something, incidentally, that could happen again), discharging even more potent greenhouse gases into the atmosphere and further heating the planet in an escalating feedback loop.

He wonders whether megaplumes carry the gases of an eruption, such as carbon dioxide and methane and helium 3, as well as minerals such as sulfur and iron, to upper layers of the ocean where most plant and animal life resides.

But in the case of a big release of undersea methane, how much would escape the ocean to exert its greenhouse effects?

Methane, the carbon - hydrogen compound that is the main component of natural gas and cow flatulence, gets trapped inside crystalline cages of frozen water in the muddy ocean bottom.

For example, it says a sudden methane release from the ocean, or a slowdown of the Gulf Stream, are «very unlikely» and that a collapse of the West Antarctic or Greenland ice sheets during this century is «exceptionally unlikely.»

Finds like that, along with sediment cores and ice cores that show how the amount of methane in the atmosphere and ocean has fluctuated dramatically in the past, have led to a slew of «methane burp» theories.

Some geologists speculate that massive volcanic eruptions covering areas as large as modern continents triggered the release of methane buried in the ocean floor, causing a greenhouse effect.

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

Living organisms could use these oxidizing chemicals to burn fuels such as iron or methane seeping up from the rocky bottom of Europa's ocean.

Already billions of years ago, Methanosarcinales archaea might have abundantly thrived under the methane - rich atmosphere in the ferruginous (iron holding) Archaean oceans, 4 to 2.5 billion years ago.

A new study led by researcher Natalia Shakhova of the University of Alaska, Fairbanks, and the Russian Academy of Sciences» Far Eastern Branch reports that methane releases from one part of the Arctic Ocean are more than twice what scientists previously thought.

Until 2003, when Shakhova's team started studying this part of the Arctic Ocean, no one had measured how much methane was being released from it.

In deeper parts of the ocean, the methane released from the ocean floor would likely never make it up to the atmosphere, since it would get used up by microbes before it reached the surface.

The microbial communities in these sediments include aggregates of methane - oxidizing archaea called ANME (for ANaerobic MEthanotrophs) and sulfate - reducing bacteria (SRB) that live together symbiotically and help to remove some 80 percent of the methane released from ocean sediments.

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.

The acetate is a product of methane and hydrogen from the alkaline hydrothermal vents and carbon dioxide dissolved in the surrounding ocean.

Our goal was to fingerprint the source of methane in the Arctic Ocean to determine if ancient methane was being liberated from the seafloor and if it survives to be emitted to the atmosphere,» says Sparrow, who conducted the study, published in Science Advances, as part of her doctoral research at the University of Rochester.

With that in mind, environmental scientist Katy Sparrow»17 (PhD) set out to study the origin of methane in the Arctic Ocean.

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.