Sentences with phrase «which methane hydrates»

The pink areas of this map are the outer continental shelves on which methane hydrates can be found.

which may be true for all I know but does not offer any mechanism by which methane hydrates (clathrates) may be destabilized, because they do not and can not exist at 50 m depth.

There is a precise curve of temperatures and pressures that define the depth at which methane hydrates exist.

[citation needed] Recently, a clay - methane hydrate intercalate was synthesized in which a methane hydrate complex was introduced at the interlayer of a sodium - rich montmorillonite clay.

[citation needed] In 2003, a clay - methane hydrate intercalate was synthesized in which a methane hydrate complex was introduced at the interlayer of a sodium - rich montmorillonite clay.

Not exact matches

«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.

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.

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.

Exponentially less methane would be able to reach the atmosphere in waters that are thousands of feet deep at the very edge of the shallow seas near continents, which is the area of the ocean where the bulk of methane hydrates are,» Sparrow says.

«You release a hydrate and then form a hydrate, which is pretty cool,» he says, especially given that methane gas hydrates represent the most abundant global natural carbon resource.

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

Van Nieuwenhuise noted that today's warming oceans could also cause hydrates on the ocean floor to release methane, which may exacerbate climate change.

Methane hydrate is potentially susceptible to ocean warming, which could trigger a positive feedback resulting in rapid climate warming.

Particularly alarming is melting methane hydrate, which likely has caused severe bouts of global warming in the past.

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.

Recent studies have therefore preferred mechanismsthat require a climatological trigger for carbon injection, for example through enhance - 5 ment of seasonal extremes that caused changes in ocean circulation, which in turncould dissociate submarine methane hydrates (Lunt et al., 2011).

The non linear nature of forcing is related more to positive feedbacks and changes that are still being studied, such as cyclic changes in moisture content and regional dispersion, the methane cycles in the ocean or the potential of methane clathrate / hydrate release, and of course the race to feed more people on a planet which will inevitably add more nitrous oxide to the atmosphere and create more dead zones in the oceans, droughts, floods, fires, dogs and cats living together, mass hysteria....

Even if most of this will probably not escape in any eventuality, I think it's very important to determine as soon as possible whether we're talking about one well with a bad cement job, one well with methane hydrate melting around it, failure of containment of most wells in Bovanenkovo (which after all will all have much the same conditions at the top of the reservoir), or failure of containment of most wells in the Yamal Project.

Actually it's clear that methane gets through the «hydrate stability zone» in surface sediments, which ought, thermodynamically, to act as cold traps and catch it.

Nature, the same journal which published Wednesday's commentary, published a scientific review of methane hydrates and climate change by Carolyn Ruppel in 2011 which suggests the scenario in said commentary is virtually impossible.

The rising sea level increases pressure at certain depths, which expands the area of methane hydrate stability.

This in turn is contributing to releasing methane hydrate deposits which threatens all life on Earth (search «geoengineering / methane release» on line).

Methane hydrate is potentially susceptible to ocean warming, which could trigger a positive feedback resulting in rapid climate warming.

Pachauri outlined the potential for major changes to the climate system, which could overwhelm human response strategies - breakdown of the thermohaline circulation, disintegration of the West Antarctic Ice Sheet, a shift in mean climate towards an El Nino - like state, reduced carbon sink capacity, methane release from hydrates, and a rearrangement of biome distributions.

This has never happened before because the sea ice never retreated very much in the summer and the water temperature could not rise above zero because of the ice cover... The permafrost is acting as a cap for a very large amount of methane (CH4), which is sitting in the sediments underneath in the form of methane hydrates.

As I mentioned previously, the recent IPCC report has plenty of detractors and failed to mention the issue of melting methyl hydrates and methane emissions from melting permafrost, over strong objections, which the June, 2013 IEA - WEO follow - up climate change report did include when it forecast a 3.6 - 5.3 degree Celsius jump in average global temperatures by 2100.

Off the Washington and Oregon coast, 168 bubble plumes had been detected in the past 10 years, a disproportionate number of which were found at a critical depth for methane hydrates» stability.

The ESS is a powerful supplier of methane to the atmosphere owing to the continued degradation of the submarine permafrost, which causes the destruction of gas hydrates.

James Hansen, adjunct professor, Department of Earth and Environmental Sciences, Columbia University and former Head of the NASA Goddard Institute for Space Studies claims the melting ice could lead to the point where ocean floor warming triggers massive release of methane hydrate, i.e., methane molecules trapped in ice crystals, which would become a «tipping point.»

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.

Following Twemoran advice, I wrote to all London MEP (8 representatives) a little more than 2 weeks ago, summarizing the impact of the Arctic amplification (on permafrost, methane hydrate and Greenland ice sheet) and the impact on NH climate with the slowing down of the jet stream and more extreme weather (+ further down the line potential issue on food security) I also attached the «Weird winter mad March Part 2» video with extract of numerous scientists of which Jeff Masters and J. Francis to illustrate the impact on NH climate.

For methane, other gases and hydrates to escape to the surface, it would have to melt at tremendous depths, which is impossible.»

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 an important part of the anthropogenic radiative forcing Methane emissions have a direct GHG effect, and they effect atmospheric chemistry and stratospheric water vapour which have additional impacts natural feedbacks involving methane likely to be important in future — via wetland response to temperature / rain change, atmospheric chemistry and, yes, arctic sources There are large stores of carbon in the Arctic, some stored as hydrates, some potentially convertible to CH4 by anaerobic resporation [from wikianswers: Without Methane is an important part of the anthropogenic radiative forcing Methane emissions have a direct GHG effect, and they effect atmospheric chemistry and stratospheric water vapour which have additional impacts natural feedbacks involving methane likely to be important in future — via wetland response to temperature / rain change, atmospheric chemistry and, yes, arctic sources There are large stores of carbon in the Arctic, some stored as hydrates, some potentially convertible to CH4 by anaerobic resporation [from wikianswers: Without Methane emissions have a direct GHG effect, and they effect atmospheric chemistry and stratospheric water vapour which have additional impacts natural feedbacks involving methane likely to be important in future — via wetland response to temperature / rain change, atmospheric chemistry and, yes, arctic sources There are large stores of carbon in the Arctic, some stored as hydrates, some potentially convertible to CH4 by anaerobic resporation [from wikianswers: Without methane likely to be important in future — via wetland response to temperature / rain change, atmospheric chemistry and, yes, arctic sources There are large stores of carbon in the Arctic, some stored as hydrates, some potentially convertible to CH4 by anaerobic resporation [from wikianswers: Without oxygen.

Japan, which imports nearly all of its energy from abroad, has set a goal for commercial production of methane from hydrate by 2017.

Methane clathrate, also called methane hydrate, hydromethane, methane ice or «fire ice» is a solid clathrate compound (more specifically, a clathrate hydrate) in which a large amount of methane is trapped within a crystal structure of water, forming a solid similar Methane clathrate, also called methane hydrate, hydromethane, methane ice or «fire ice» is a solid clathrate compound (more specifically, a clathrate hydrate) in which a large amount of methane is trapped within a crystal structure of water, forming a solid similar methane hydrate, hydromethane, methane ice or «fire ice» is a solid clathrate compound (more specifically, a clathrate hydrate) in which a large amount of methane is trapped within a crystal structure of water, forming a solid similar methane ice or «fire ice» is a solid clathrate compound (more specifically, a clathrate hydrate) in which a large amount of methane is trapped within a crystal structure of water, forming a solid similar methane is trapped within a crystal structure of water, forming a solid similar to ice.

The runaway greenhouse effect has several meanings ranging from, at the low end, global warming sufficient to induce out - of - control amplifying feedbacks, such as ice sheet disintegration and melting of methane hydrates, to, at the high end, a Venus - like hothouse with crustal carbon baked into the atmosphere and a surface temperature of several hundred degrees, a climate state from which there is no escape.

In the Arctic, due to colder - than - average water temperatures, only about 200 m of water depth is required, which increases the vulnerability of those methane hydrates to a warming Arctic Ocean.

The potential carbon source for hyperthermal warming that received most initial attention was methane hydrates on continental shelves, which could be destabilized by sea floor warming [15].

Methane hydrates have now reached a temperature which will no longer allow its former retention in hydrate form on the sea floor.

The IPCC report also said that a possible release of ghg thawing permafrost and methane hydrates — which are «not accounted for in current models» — would shrink the remaining budget even further.

Methane hydrate and hydrogen sulfide release still seem to be real possibilities — even today there are periodichydrogen sulfide «belches» off the Namibean coast which hint at the possibility of wider releases in a warming climate.

These warming spikes could be due to methane hydrate releases, or to global eutrophication caused by a hyperactive hydrological cycle, which might cause algal blooms on a global scale.

Chances are, David's estimate was very low, because he did not account for the bouyancy of methane and the chronic methane emissions, which could be very significant and long lasting from such a hydrate layer.

C (or methane hydrates / clathrates, in case that isn't considered geologic)-RRB-, Halting all marine photosynthesis and letting respiration / decay continue at the same rate (it would actually decay over time as less organic C would be available) would result in an O2 decrease at a rate of about 0.011 % per year, but it could only fall at that rate for about 3 weeks, with a total O2 decrease of about 0.000675 % (relative to total O2, and not counting organic C burial, which wouldn't make a big difference); Halting all land photosynthesis and letting respirationd / decay proceed at the same rate would cause O2 to fall about 0.027 % per year for about 19 years, with a total drop of about 0.52 %.

Lynn, see http://www.realclimate.org/index.php?p=227 which attempts to analyze the chances of a methane hydrate driven gw catastrophe.

RealClimate is wonderful, and an excellent source of reliable information.As I've said before, methane is an extremely dangerous component to global warming.Comment # 20 is correct.There is a sharp melting point to frozen methane.A huge increase in the release of methane could happen within the next 50 years.At what point in the Earth's temperature rise and the rise of co2 would a huge methane melt occur?No one has answered that definitive issue.If I ask you all at what point would huge amounts of extra methane start melting, i.e at what temperature rise of the ocean near the Artic methane ice deposits would the methane melt, or at what point in the rise of co2 concentrations in the atmosphere would the methane melt, I believe that no one could currently tell me the actual answer as to where the sharp melting point exists.Of course, once that tipping point has been reached, and billions of tons of methane outgass from what had been locked stores of methane, locked away for an eternity, it is exactly the same as the burning of stored fossil fuels which have been stored for an eternity as well.And even though methane does not have as long a life as co2, while it is around in the air it can cause other tipping points, i.e. permafrost melting, to arrive much sooner.I will reiterate what I've said before on this and other sites.Methane is a hugely underreported, underestimated risk.How about RealClimate attempts to model exactly what would happen to other tipping points, such as the melting permafrost, if indeed a huge increase in the melting of the methal hydrate ice WERE to occur within the next 50 years.My amateur guess is that the huge, albeit temporary, increase in methane over even three or four decades might push other relevent tipping points to arrive much, much, sooner than they normally would, thereby vastly incresing negative feedback mechanisms.We KNOW that quick, huge, changes occured in the Earth's climate in the past.See other relevent posts in the past from Realclimate.Climate often does not change slowly, but undergoes huge, quick, changes periodically, due to negative feedbacks accumulating, and tipping the climate to a quick change.Why should the danger from huge potential methane releases be vievwed with any less trepidation?

Methane hydrate and hydrogen sulfide release still seem to be real possibilities — even today there are periodic hydrogen sulfide «belches» off the Namibean coast which hint at the possibility of wider releases in a warming climate.

But that might invoke rapid permafrost melt which would take us to 5 C, and that could lead to methane hydrate releases good for another degree of warming.

This is still very early science, and we have some estimates of what may happen to those from modelling studies, from looking at the way in which the heating of the very upper layers of the Arctic Ocean is transferred down through the depth of the ocean - even in these relatively shallow Arctic shelf regions - and then into the sediments that would allow the methane hydrates to destabilise.