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Did postglacial catastrophic flooding trigger massive changes in the Black Sea gas hydrate reservoir?
Poort, J.; Vassilev, A.; Dimitrov, L. (2005). Did postglacial catastrophic flooding trigger massive changes in the Black Sea gas hydrate reservoir? Terra nova (Print) 17(2): 135-140. dx.doi.org/10.1111/j.1365-3121.2005.00599.x
In: Terra Nova. Blackwell: Oxford. ISSN 0954-4879; e-ISSN 1365-3121
Peer reviewed article  

Available in  Authors 

Keyword
    Marine/Coastal

Authors  Top 
  • Poort, J.
  • Vassilev, A.
  • Dimitrov, L.

Abstract
    After the Last Glacial Maximum, the semi-land-locked Black Sea basin was flooded by warm water from the Mediterranean Sea. This major sea level rise and change of physical water properties had a large impact on the gas hydrate reservoir in the sediments below. Modelling of the regional response of the gas hydrate stability zone (GHSZ) to the Black Sea flooding 7100 years ago shows that a strong effect of near-bottom temperature increase pushes the gas hydrate reservoir to a large shrinking of 15–62% that may release up to 1.1–4.6 Gt of methane. This catastrophic scenario is, however, delayed because of the transient nature of the heat wave propagation. The large-scale reduction of the GHSZ is only to take place within the next thousand years. At present, widespread hydrate dissociation is only expected to occur where there is a minimum water depth for hydrate stability.

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