Stability of relic methane hydrates under climatic changes in the Holocene

The results of numerical modeling of the thermal regime of high-latitude permafrost regions of Western Siberia (the Yamal Peninsula) for the last 6 thousand years are presented. Thermobaric conditions for stability and dissociation of continental methane hydrates are defined. It is shown that at the...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2019-11, Vol.386 (1), p.12019
Main Authors: Arzhanov, M M, Malakhova, V V, Mokhov, I I, Parfenova, M R
Format: Article
Language:English
Subjects:
Climate change
Frozen ground
Gas hydrates
Holocene
Hydrates
Methane
Methane hydrates
Permafrost
Soil stability
Soil strength
Soil temperature
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Summary:The results of numerical modeling of the thermal regime of high-latitude permafrost regions of Western Siberia (the Yamal Peninsula) for the last 6 thousand years are presented. Thermobaric conditions for stability and dissociation of continental methane hydrates are defined. It is shown that at the present time relict methane hydrates can exist at depths of up to 150 m in the strata of frozen soil of Yamal above the modern boundary of the stability zone, having "survived" warming in the Mid-Holocene warm period (about 6,000-5,000 years ago) at negative temperatures in the permafrost. According to the results obtained, the current warming in Yamal region exceeds the warming of the Mid-Holocene. The increase of the temperature of the permafrost layer can reduce the strength of the soil and lead to dissociation of the near-surface gas hydrates.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/386/1/012019