Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling
Destabilization of intrapermafrost gas hydrate is one possible reason for methane emission on the Arctic shelf. The formation of these intrapermafrost gas hydrates could occur almost simultaneously with the permafrost sediments due to the occurrence of a hydrate stability zone after sea regression a...
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Online Access: | http://earchive.tpu.ru/handle/11683/64910 https://doi.org/10.3390/geosciences9040188 |
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fttomskpuniv:oai:earchive.tpu.ru:11683/64910 2023-05-15T14:25:49+02:00 Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling Chuvilin, Evgeny Mikhaylovich Ekimova, Valentina Bukhanov, Boris Aleksandrovich Grebenkin, Sergey Igorevich Shakhova, Nataljya Evgenjevna Semiletov, Igor Petrovich 2019 application/pdf http://earchive.tpu.ru/handle/11683/64910 https://doi.org/10.3390/geosciences9040188 en eng MDPI AG Geosciences. 2019. Vol. 9, iss. 4 Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling / E. M. Chuvilin, V. V. Ekimova, B. A. Bukhanov [et al.] // Geosciences. — 2019. — Vol. 9, iss. 4. — [188, 18 p.]. http://earchive.tpu.ru/handle/11683/64910 doi:10.3390/geosciences9040188 info:eu-repo/semantics/openAccess Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ CC-BY-NC Geosciences арктический шельф вечная мерзлота газовые гидраты arctic shelf permafrost gas hydrate temperature increase hydrate dissociation methane emission environmental impact geohazard Article info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 fttomskpuniv https://doi.org/10.3390/geosciences9040188 2021-03-30T16:27:56Z Destabilization of intrapermafrost gas hydrate is one possible reason for methane emission on the Arctic shelf. The formation of these intrapermafrost gas hydrates could occur almost simultaneously with the permafrost sediments due to the occurrence of a hydrate stability zone after sea regression and the subsequent deep cooling and freezing of sediments. The top of the gas hydrate stability zone could exist not only at depths of 200–250 m, but also higher due to local pressure increase in gas-saturated horizons during freezing. Formed at a shallow depth, intrapermafrost gas hydrates could later be preserved and transform into a metastable (relict) state. Under the conditions of submarine permafrost degradation, exactly relict hydrates located above the modern gas hydrate stability zone will, first of all, be involved in the decomposition process caused by negative temperature rising, permafrost thawing, and sediment salinity increasing. That’s why special experiments were conducted on the interaction of frozen sandy sediments containing relict methane hydrates with salt solutions of different concentrations at negative temperatures to assess the conditions of intrapermafrost gas hydrates dissociation. Experiments showed that the migration of salts into frozen hydrate-containing sediments activates the decomposition of pore gas hydrates and increase the methane emission. These results allowed for an understanding of the mechanism of massive methane release from bottom sediments of the East Siberian Arctic shelf. Article in Journal/Newspaper Arctic Arctic permafrost вечная мерзлота Tomsk Polytechnic University (TPU): Electronic Archive Arctic Geosciences 9 4 188 |
institution |
Open Polar |
collection |
Tomsk Polytechnic University (TPU): Electronic Archive |
op_collection_id |
fttomskpuniv |
language |
English |
topic |
арктический шельф вечная мерзлота газовые гидраты arctic shelf permafrost gas hydrate temperature increase hydrate dissociation methane emission environmental impact geohazard |
spellingShingle |
арктический шельф вечная мерзлота газовые гидраты arctic shelf permafrost gas hydrate temperature increase hydrate dissociation methane emission environmental impact geohazard Chuvilin, Evgeny Mikhaylovich Ekimova, Valentina Bukhanov, Boris Aleksandrovich Grebenkin, Sergey Igorevich Shakhova, Nataljya Evgenjevna Semiletov, Igor Petrovich Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling |
topic_facet |
арктический шельф вечная мерзлота газовые гидраты arctic shelf permafrost gas hydrate temperature increase hydrate dissociation methane emission environmental impact geohazard |
description |
Destabilization of intrapermafrost gas hydrate is one possible reason for methane emission on the Arctic shelf. The formation of these intrapermafrost gas hydrates could occur almost simultaneously with the permafrost sediments due to the occurrence of a hydrate stability zone after sea regression and the subsequent deep cooling and freezing of sediments. The top of the gas hydrate stability zone could exist not only at depths of 200–250 m, but also higher due to local pressure increase in gas-saturated horizons during freezing. Formed at a shallow depth, intrapermafrost gas hydrates could later be preserved and transform into a metastable (relict) state. Under the conditions of submarine permafrost degradation, exactly relict hydrates located above the modern gas hydrate stability zone will, first of all, be involved in the decomposition process caused by negative temperature rising, permafrost thawing, and sediment salinity increasing. That’s why special experiments were conducted on the interaction of frozen sandy sediments containing relict methane hydrates with salt solutions of different concentrations at negative temperatures to assess the conditions of intrapermafrost gas hydrates dissociation. Experiments showed that the migration of salts into frozen hydrate-containing sediments activates the decomposition of pore gas hydrates and increase the methane emission. These results allowed for an understanding of the mechanism of massive methane release from bottom sediments of the East Siberian Arctic shelf. |
format |
Article in Journal/Newspaper |
author |
Chuvilin, Evgeny Mikhaylovich Ekimova, Valentina Bukhanov, Boris Aleksandrovich Grebenkin, Sergey Igorevich Shakhova, Nataljya Evgenjevna Semiletov, Igor Petrovich |
author_facet |
Chuvilin, Evgeny Mikhaylovich Ekimova, Valentina Bukhanov, Boris Aleksandrovich Grebenkin, Sergey Igorevich Shakhova, Nataljya Evgenjevna Semiletov, Igor Petrovich |
author_sort |
Chuvilin, Evgeny Mikhaylovich |
title |
Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling |
title_short |
Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling |
title_full |
Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling |
title_fullStr |
Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling |
title_full_unstemmed |
Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling |
title_sort |
role of salt migration in destabilization of intra permafrost hydrates in the arctic shelf: experimental modeling |
publisher |
MDPI AG |
publishDate |
2019 |
url |
http://earchive.tpu.ru/handle/11683/64910 https://doi.org/10.3390/geosciences9040188 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arctic permafrost вечная мерзлота |
genre_facet |
Arctic Arctic permafrost вечная мерзлота |
op_source |
Geosciences |
op_relation |
Geosciences. 2019. Vol. 9, iss. 4 Role of Salt Migration in Destabilization of Intra Permafrost Hydrates in the Arctic Shelf: Experimental Modeling / E. M. Chuvilin, V. V. Ekimova, B. A. Bukhanov [et al.] // Geosciences. — 2019. — Vol. 9, iss. 4. — [188, 18 p.]. http://earchive.tpu.ru/handle/11683/64910 doi:10.3390/geosciences9040188 |
op_rights |
info:eu-repo/semantics/openAccess Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.3390/geosciences9040188 |
container_title |
Geosciences |
container_volume |
9 |
container_issue |
4 |
container_start_page |
188 |
_version_ |
1766298279081934848 |