The methane
hydrate deposits in the Arctic Ocean may represent a somewhat greater hazard because the Arctic is warming so rapidly.
The time needed to destabilize large methane
hydrate deposits in deep sediments is likely millennia [215].
Furthermore, the project will investigate potential future climate effects from destabilisation of methane
hydrate deposits in a warming climate, and will focus on scenarios in 2050 and 2100.
The time needed to destabilize large methane
hydrate deposits in deep sediments is likely millennia [215].
Furthermore, the project will investigate potential future climate effects from destabilisation of methane
hydrate deposits in a warming climate, and will focus on scenarios in 2050 and 2100.
Or considering how much
hydrates deposits in the ocean, it seems a future generation could greatly benefit knowing whether mining such deposit is or is not economically viable.
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).
Far more is locked away
in frozen
deposits called methane gas
hydrates.
Not the least of the challenges is that marine
hydrate deposits are located
in ocean mud up to a kilometer below the seafloor.
Under most frozen
hydrate deposits is a layer of free methane gas occupying the pore spaces
in the sediment.
Researchers have been studying this process
in a concentrated effort 100 kilometers off the coast of Oregon, along a dumbbell - shaped promontory called
Hydrate Ridge for the icy
deposits that virtually pave the seafloor there.
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.
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.
In March, Japan became the first country to successfully extract methane from frozen undersea
deposits called gas
hydrates.
This issue has quickly risen because Japan conducted its second production test of these
deposits, known as methane
hydrates,
in May.
Worldwide, particularly
in deeply buried permafrost and
in high - latitude ocean sediments where pressures are high and temperatures are below freezing, icy
deposits called
hydrates hold immense amounts of methane (SN: 6/25/05, p. 410).
I have posted on RealClimate about 4 times
in the past 5 years regarding the potential thaw of the methal
hydrate deposits at the bottom of the oceans.I stated
in my posts on your website that I believe firmly that those
deposits are
in quite a good bit of danger of melting from climate change feedback mechanisms.On Nov 8th, ScienceDaily posted a huge new study on the PETM boundary 55 million years ago, and some key data on how the methane at that point may very well have melted and contributed to the massive climate shift.I am an amateur who reads
in the new a lot about climate change.I'd now like to say «I told you so!!!»
SkS:
In your JGR paper from 2010 you state that methane hydrate in Siberia can occur at depths as shallow as 20 m. Have any such remarkably shallow methane hydrate deposits on the ESAS been directly observed / sampled and if so, how could methane hydrate have formed at such depth
In your JGR paper from 2010 you state that methane
hydrate in Siberia can occur at depths as shallow as 20 m. Have any such remarkably shallow methane hydrate deposits on the ESAS been directly observed / sampled and if so, how could methane hydrate have formed at such depth
in Siberia can occur at depths as shallow as 20 m. Have any such remarkably shallow methane
hydrate deposits on the ESAS been directly observed / sampled and if so, how could methane
hydrate have formed at such depths?
That Shakhova 2010 paper opens with: «The sharp growth
in methane emission (50 Gt over 1 - 5 years) from destructed gas
hydrate deposits on the ESS should result
in an increase
in the global surface temperature by 3.3 C by the end of the current century instead of the expected 2C.»
This task is made easier by not quantifying the likely magnitude of CH4
deposits in the Arctic, not specifying CH4 sources (
hydrates, sedimentary gas, yedoma and resumption of biota decay), and not examining the differing vulnerability of those
deposits to global warming
in general and Arctic amplification
in particular.
This
in turn is contributing to releasing methane
hydrate deposits which threatens all life on Earth (search «geoengineering / methane release» on line).
In Siberian permafrost, large deposits of methane gas are trapped in ice, forming what is called a gas hydrat
In Siberian permafrost, large
deposits of methane gas are trapped
in ice, forming what is called a gas hydrat
in ice, forming what is called a gas
hydrate.
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).
Another vast source of methane is
in icy
deposits known as methane
hydrates, often
in sediments deep under the world's oceans.
In fact, only one source of carbon that is isotopically light and available in large enough quantities has been pinpointed so far, this is the reservoir of methane hydrate deposits (Figure 2) buried on the continental shelves of the oceans (Figure 3
In fact, only one source of carbon that is isotopically light and available
in large enough quantities has been pinpointed so far, this is the reservoir of methane hydrate deposits (Figure 2) buried on the continental shelves of the oceans (Figure 3
in large enough quantities has been pinpointed so far, this is the reservoir of methane
hydrate deposits (Figure 2) buried on the continental shelves of the oceans (Figure 3).
The US Department of Energy (DOE) National Energy Technology Laboratory has issued a solicitation (DE-FOA-0000891) for up to $ 20 million
in funding for projects that focus on the following three technical topic areas: (1) characterization of methane
hydrate deposits; (2) response of methane
hydrate reservoirs to induced environmental change; and... Read more →
But include methane
hydrate deposits being able to be mined, then appears to more total energy
in oceanic methane
deposit: «Recent estimates constrained by direct sampling suggest the global inventory occupies between 1 × 10 ^ 15 and 3 × 10 ^ 15 m ³ (0.24 to 1.2 million cubic miles).
These new projects, managed by the Energy Department's National Energy Technology Laboratory, will focus research on field programs for deepwater
hydrate characterization, the response of methane
hydrate systems to changing climates, and advances
in the understanding of gas -
hydrate - bearing
deposits.
I refer to the carbon held
in undersea methane
hydrate deposits, the methane held
in tundral permafrost, the organic carbon held
in broad scale peat
deposits, the organic carbon held
in deep sea ooze
deposits, the inorganic carbon held
in outcropping karstic limestones, calcretes etc., etc..
It would be quite a coincidence, Berndt said, to find methane emissions
in a place where the water is warming and where there are known
hydrate deposits — and to have those three things be completely unrelated.
Economic
deposits of
hydrate are termed Natural Gas Hydrate (NGH) and are unique in that they store 164 m3 of methane, 0.8 m3 water in 1 m3 h
hydrate are termed Natural Gas
Hydrate (NGH) and are unique in that they store 164 m3 of methane, 0.8 m3 water in 1 m3 h
Hydrate (NGH) and are unique
in that they store 164 m3 of methane, 0.8 m3 water
in 1 m3
hydratehydrate.
Also, most of the methane is
in the deep gas
deposits, not
in the possible regional layer of shallow methane
hydrate possibly associated with the Yamal crater.
I don't know of other discussion
in the literature looking specifically at changes
in warm currents
in relation to known methane
hydrate deposits.
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?
Sometimes the methane moves around
in the earth, and collects someplace, forming what are called structural
hydrate deposits.
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.