ライフサイエンスコーパス: methane hydrate

1 of the spontaneous nucleation and growth of methane hydrate.

2 reenhouse forcing by the carbon derived from methane hydrate.

3 s cause methane to form ice-like crystals of methane hydrate.

4 tudies of sediments related to a decomposing methane hydrate.

5 from surface sedimentary reservoirs such as methane hydrates.

6 ing the destabilization of 2.5 gigatonnes of methane hydrate (about 0.2 per cent of that required to

7 Our results demonstrate the potential for methane hydrate accumulation in Antarctic sedimentary ba

8 th the Gulf Stream are rapidly destabilizing methane hydrate along a broad swathe of the North Americ

9 Marine deposits of methane hydrate are estimated to be large, amassing abou

10 Natural methane hydrates are believed to be the largest source o

11 Methane hydrates are ice-like inclusion compounds with i

12 The structure II methane hydrate at 250 MPa has a cubic unit cell of a =

13 re presented of the spontaneous formation of methane hydrate at a methane/liquid water interface.

14 hat determine the thermodynamic behaviour of methane hydrate at pressures up to 10 GPa.

15 on of seawater can accelerate the melting of methane hydrates at depth from timescales of millennia t

16 greenhouse gas levels, with dissociation of methane hydrates being the most commonly invoked explana

17 y therefore represent only a fraction of the methane hydrate currently destabilizing globally.

18 herefore, where seafloor fluid expulsion and methane hydrate deposits coincide, the base of the hydra

19 lends strong support to the hypothesis that methane hydrate destabilization contributed to the enigm

20 Methane hydrate destabilization is increasingly suspecte

21 sing during post-glacial oceanic overturn or methane hydrate destabilization.

22 Current understanding assumes that methane hydrate dissociates into ice and free methane in

23 nic methane as a result of continental-shelf methane hydrate dissociation has been put forward as a p

24 rocks were the result of destabilization of methane hydrates during deglaciation and concomitant flo

25 that pressure/temperature conditions favour methane hydrate formation down to sediment depths of abo

26 inement effects on nanopore space, synthetic methane hydrates grow under mild conditions (3.5 MPa and

27 The most compelling criticism of the latter 'methane hydrate' hypothesis has been the apparent lack o

28 Detailed study of pure methane hydrate in a diamond cell with in situ optical,

29 ards the application of a smart synthesis of methane hydrates in energy-demanding applications (for e

30 assigned a role as water-ice antifreeze and methane hydrate inhibitor which is thought to contribute

31 The self-preservation effect of sI methane hydrate is significant at lower temperatures (26

32 Methane hydrate is thought to have been the dominant met

33 sing; (iii) the release of methane stored in methane hydrates; (iv) the decomposition and oxidation o

34 creased area implies that significantly more methane hydrate lies close to being unstable and hence c

35 upport the notion that degassing of biogenic methane hydrate may have been an important factor in alt

36 estimate of 2.5 gigatonnes of destabilizing methane hydrate may therefore represent only a fraction

37 To understand the mechanism of methane hydrate nucleation from supersaturated aqueous s

38 llow continental shelves and dissociation of methane hydrate on upper continental slopes.

39 tribution from old carbon reservoirs (marine methane hydrates, permafrost and methane trapped under i

40 ographic data have been used to suggest that methane hydrates play a significant role in global clima

41 ting changing circulation as the trigger for methane hydrate release.

42 tely 1,050-2,100 Gt of carbon from sea-floor methane hydrate reservoirs.

43 h time and what effect these changes have on methane hydrate stability is unclear.

44 om seismic imaging, in which the base of the methane hydrate stability zone is frequently identifiabl

45 Suggested sources include submarine methane hydrates, terrigenous organic matter, and thermo

46 ure is the thermodynamically stable form for methane hydrate; this is in accord with the results of r

47 and convert hundreds of gigatonnes of frozen methane hydrate trapped below the sea floor into methane

48 Our findings suggest that nucleation of methane hydrates under these realistic conditions cannot

49 ikely to dominate over the known structure I methane hydrate within deep hydrate-bearing sediments un