Defining the updip extent of the gas hydrate stability zone on continental margins with low geothermal gradients

Gorman, A. R.; Senger, Kim

doi:10.1029/2009jb006680

Cited by 13 publications

(15 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As described by Kvenvolden [1988b] and considered in numerous observational and modeling studies [e.g., Berndt et al, 2014;Brothers et al, 2014;Davies et al, 2015;Gorman and Senger, 2010;Johnson et al, 2015;Kennett et al, 2003;Marín-Moreno et al, 2015;Marín-Moreno et al, 2013;Mienert et al, 2005;Pecher et al, 2005;Phrampus and Hornbach, 2012;Phrampus et al, 2014;Reagan and Moridis, 2009;Reagan et al, 2011;Ruppel, 2011a;Skarke et al, 2014;Stranne et al, 2016a;Stranne et al, 2016b;Weinstein et al, 2016;Westbrook et al, 2009] gas hydrates within upper continental slope sediments constitute the key marine hydrate population that is susceptible to degradation during ocean warming (Figure 9). The GHSZ vanishes on upper slopes (i.e., the "feather edge" of hydrate stability in Ruppel [2011a]).…”

Section: Upper Continental Slopesmentioning

confidence: 99%

The interaction of climate change and methane hydrates

Ruppel

Kessler

2017

Reviews of Geophysics

645

554

View full text Add to dashboard Cite

Gas hydrate, a frozen, naturally‐occurring, and highly‐concentrated form of methane, sequesters significant carbon in the global system and is stable only over a range of low‐temperature and moderate‐pressure conditions. Gas hydrate is widespread in the sediments of marine continental margins and permafrost areas, locations where ocean and atmospheric warming may perturb the hydrate stability field and lead to release of the sequestered methane into the overlying sediments and soils. Methane and methane‐derived carbon that escape from sediments and soils and reach the atmosphere could exacerbate greenhouse warming. The synergy between warming climate and gas hydrate dissociation feeds a popular perception that global warming could drive catastrophic methane releases from the contemporary gas hydrate reservoir. Appropriate evaluation of the two sides of the climate‐methane hydrate synergy requires assessing direct and indirect observational data related to gas hydrate dissociation phenomena and numerical models that track the interaction of gas hydrates/methane with the ocean and/or atmosphere. Methane hydrate is likely undergoing dissociation now on global upper continental slopes and on continental shelves that ring the Arctic Ocean. Many factors—the depth of the gas hydrates in sediments, strong sediment and water column sinks, and the inability of bubbles emitted at the seafloor to deliver methane to the sea‐air interface in most cases—mitigate the impact of gas hydrate dissociation on atmospheric greenhouse gas concentrations though. There is no conclusive proof that hydrate‐derived methane is reaching the atmosphere now, but more observational data and improved numerical models will better characterize the climate‐hydrate synergy in the future.

show abstract

Section: Upper Continental Slopesmentioning

confidence: 99%

The interaction of climate change and methane hydrates

Ruppel

Kessler

2017

Reviews of Geophysics

645

554

View full text Add to dashboard Cite

show abstract

“…In order to constrain the Nyegga gas hydrate system in two dimensions, a thermobaric model was established to calculate the extent of the hydrate stability zone (HSZ, Figure 2, [59]). The HSZ is defined on the basis of the hydrate phase boundary, the geothermal gradient and the oceanic thermal gradient.…”

Section: Modeling the Hydrate Stability Zonementioning

confidence: 99%

First-Order Estimation of In-Place Gas Resources at the Nyegga Gas Hydrate Prospect, Norwegian Sea

2010

Self Cite

View full text Add to dashboard Cite

Gas hydrates have lately received increased attention as a potential future energy source, which is not surprising given their global and widespread occurrence. This article presents an integrated study of the Nyegga site offshore mid-Norway, where a gas hydrate prospect is defined on the basis of a multitude of geophysical models and one shallow geotechnical borehole. This prospect appears to hold around 625 GSm 3 (GSm 3 = 10 9 standard cubic metres) of gas. The uncertainty related to the input parameters is dealt with through a stochastic calculation, giving a spread of in-place volumes of 183 GSm 3 (P90) to 1431 GSm 3 (P10). The resource density for Nyegga is found to be comparable to published resource assessments of other global hydrate provinces.

show abstract

“…For this reason, transient modelling is necessary to understand how the hydrate dissociation could happen, since it shows how the hydrate system changes during the warming or cooling period until the equilibrium state. Moreover, an integration with geophysical data, in particular seismic data, could contribute to calibrate future models and to make appropriate assumptions on the initial gas hydrate distribution and saturation, which are inhomogeneous from down-slope to up-slope [53,65]. Furthermore, our steady state modelling demonstrates that more effort should be devoted to gaining a better understanding of the relationship between the gas hydrate system and complex natural phenomena, such as climate change, slope stability and earthquakes.…”

Section: Discussionmentioning

confidence: 96%

Potential Instability of Gas Hydrates along the Chilean Margin Due to Ocean Warming

et al. 2019

View full text Add to dashboard Cite

In the last few years, interest in the offshore Chilean margin has increased rapidly due to the presence of gas hydrates. We have modelled the gas hydrate stability zone off Chilean shores (from 33° S to 46° S) using a steady state approach to evaluate the effects of climate change on gas hydrate stability. Present day conditions were modelled using published literature and compared with available measurements. Then, we simulated the effects of climate change on gas hydrate stability in 50 and 100 years on the basis of Intergovernmental Panel on Climate Change and National Aeronautics and Space Administration forecasts. An increase in temperature might cause the dissociation of gas hydrate that could strongly affect gas hydrate stability. Moreover, we found that the high seismicity of this area could have a strong effect on gas hydrate stability. Clearly, the Chilean margin should be considered as a natural laboratory for understanding the relationship between gas hydrate systems and complex natural phenomena, such as climate change, slope stability and earthquakes.

show abstract

Defining the updip extent of the gas hydrate stability zone on continental margins with low geothermal gradients

Cited by 13 publications

References 53 publications

The interaction of climate change and methane hydrates

The interaction of climate change and methane hydrates

First-Order Estimation of In-Place Gas Resources at the Nyegga Gas Hydrate Prospect, Norwegian Sea

Potential Instability of Gas Hydrates along the Chilean Margin Due to Ocean Warming

Contact Info

Product

Resources

About