INFLUENCE OF RIFT ZONES AND THERMOKARST LAKES ON THE FORMATION OF SUBAQUEOUS PERMAFROST AND THE STABILITY ZONE OF METHANE HYDRATES OF THE LAPTEV SEA SHELF IN THE PLEISTOCENE
This paper presents results of the analysis of the influence of talik zones associated with thermokarst lakes and processes in rift zones on the dynamics of subaqueous permafrost and zones of stability of methane hydrates for conditions of theLaptev Seashelf. The model of thermophysical processes in...
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Language: | Russian |
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Nauka
2018
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Online Access: | https://doi.org/10.15356/2076-6734-2018-2-231-242 https://doaj.org/article/92a691738faa44dd8d526c8f9955277c |
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ftdoajarticles:oai:doaj.org/article:92a691738faa44dd8d526c8f9955277c 2023-05-15T15:14:00+02:00 INFLUENCE OF RIFT ZONES AND THERMOKARST LAKES ON THE FORMATION OF SUBAQUEOUS PERMAFROST AND THE STABILITY ZONE OF METHANE HYDRATES OF THE LAPTEV SEA SHELF IN THE PLEISTOCENE V. V. Malakhova A. V. Eliseev 2018-05-01T00:00:00Z https://doi.org/10.15356/2076-6734-2018-2-231-242 https://doaj.org/article/92a691738faa44dd8d526c8f9955277c RU rus Nauka https://ice-snow.igras.ru/jour/article/view/458 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.15356/2076-6734-2018-2-231-242 https://doaj.org/article/92a691738faa44dd8d526c8f9955277c Лëд и снег, Vol 58, Iss 2, Pp 231-242 (2018) арктический шельф гидраты метана ледниковые циклы многолетнемёрзлые породы термокарстовые озёра Science Q article 2018 ftdoajarticles https://doi.org/10.15356/2076-6734-2018-2-231-242 2023-03-19T01:40:11Z This paper presents results of the analysis of the influence of talik zones associated with thermokarst lakes and processes in rift zones on the dynamics of subaqueous permafrost and zones of stability of methane hydrates for conditions of theLaptev Seashelf. The model of thermophysical processes in the bottom sediments together with the scenario of climate change on the Arctic shelf for the last 400 thousand years (kyr) were used. Typical value of geothermal heat flux for the most part of the shelf and for the shallow shelf (with the present-day depth of ≤50 m) is estimated as 60 mW/m2. It is shown that with this value the duration of the interglacials and the corresponding ocean transgression periods is not sufficient for the complete degradation of permafrost and destruction of the gas hydrates. For a deeper shelf, however, the complete disappearance of the stability zone of the methane hydrates is possible during the interglacial periods. In the areas of oceanic faults (rifts), higher values of the deep heat flux increase rates of degradation of the underwater permafrost rocks in the interglacial periods as compared with the condition when the heat flux is 60 mW/m2. Intensification of degradation of the subsea permafrost is manifested in areas where thermokarst lakes arise, but here it is associated with the temperature rise at the upper boundary of the bottom sediments. The presence of the rift zones and/or the thermokarst lakes promotes decreasing of the presentday thickness of the permafrost, and simultaneous impact of these two factors can lead to a through thawing of the shelf in the interglacials (including Holocene). Article in Journal/Newspaper Arctic Climate change laptev Laptev Sea permafrost Thermokarst термокарст* Directory of Open Access Journals: DOAJ Articles Arctic Laptev Sea Talik ENVELOPE(146.601,146.601,59.667,59.667) Ice and Snow 58 2 231 242 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
Russian |
topic |
арктический шельф гидраты метана ледниковые циклы многолетнемёрзлые породы термокарстовые озёра Science Q |
spellingShingle |
арктический шельф гидраты метана ледниковые циклы многолетнемёрзлые породы термокарстовые озёра Science Q V. V. Malakhova A. V. Eliseev INFLUENCE OF RIFT ZONES AND THERMOKARST LAKES ON THE FORMATION OF SUBAQUEOUS PERMAFROST AND THE STABILITY ZONE OF METHANE HYDRATES OF THE LAPTEV SEA SHELF IN THE PLEISTOCENE |
topic_facet |
арктический шельф гидраты метана ледниковые циклы многолетнемёрзлые породы термокарстовые озёра Science Q |
description |
This paper presents results of the analysis of the influence of talik zones associated with thermokarst lakes and processes in rift zones on the dynamics of subaqueous permafrost and zones of stability of methane hydrates for conditions of theLaptev Seashelf. The model of thermophysical processes in the bottom sediments together with the scenario of climate change on the Arctic shelf for the last 400 thousand years (kyr) were used. Typical value of geothermal heat flux for the most part of the shelf and for the shallow shelf (with the present-day depth of ≤50 m) is estimated as 60 mW/m2. It is shown that with this value the duration of the interglacials and the corresponding ocean transgression periods is not sufficient for the complete degradation of permafrost and destruction of the gas hydrates. For a deeper shelf, however, the complete disappearance of the stability zone of the methane hydrates is possible during the interglacial periods. In the areas of oceanic faults (rifts), higher values of the deep heat flux increase rates of degradation of the underwater permafrost rocks in the interglacial periods as compared with the condition when the heat flux is 60 mW/m2. Intensification of degradation of the subsea permafrost is manifested in areas where thermokarst lakes arise, but here it is associated with the temperature rise at the upper boundary of the bottom sediments. The presence of the rift zones and/or the thermokarst lakes promotes decreasing of the presentday thickness of the permafrost, and simultaneous impact of these two factors can lead to a through thawing of the shelf in the interglacials (including Holocene). |
format |
Article in Journal/Newspaper |
author |
V. V. Malakhova A. V. Eliseev |
author_facet |
V. V. Malakhova A. V. Eliseev |
author_sort |
V. V. Malakhova |
title |
INFLUENCE OF RIFT ZONES AND THERMOKARST LAKES ON THE FORMATION OF SUBAQUEOUS PERMAFROST AND THE STABILITY ZONE OF METHANE HYDRATES OF THE LAPTEV SEA SHELF IN THE PLEISTOCENE |
title_short |
INFLUENCE OF RIFT ZONES AND THERMOKARST LAKES ON THE FORMATION OF SUBAQUEOUS PERMAFROST AND THE STABILITY ZONE OF METHANE HYDRATES OF THE LAPTEV SEA SHELF IN THE PLEISTOCENE |
title_full |
INFLUENCE OF RIFT ZONES AND THERMOKARST LAKES ON THE FORMATION OF SUBAQUEOUS PERMAFROST AND THE STABILITY ZONE OF METHANE HYDRATES OF THE LAPTEV SEA SHELF IN THE PLEISTOCENE |
title_fullStr |
INFLUENCE OF RIFT ZONES AND THERMOKARST LAKES ON THE FORMATION OF SUBAQUEOUS PERMAFROST AND THE STABILITY ZONE OF METHANE HYDRATES OF THE LAPTEV SEA SHELF IN THE PLEISTOCENE |
title_full_unstemmed |
INFLUENCE OF RIFT ZONES AND THERMOKARST LAKES ON THE FORMATION OF SUBAQUEOUS PERMAFROST AND THE STABILITY ZONE OF METHANE HYDRATES OF THE LAPTEV SEA SHELF IN THE PLEISTOCENE |
title_sort |
influence of rift zones and thermokarst lakes on the formation of subaqueous permafrost and the stability zone of methane hydrates of the laptev sea shelf in the pleistocene |
publisher |
Nauka |
publishDate |
2018 |
url |
https://doi.org/10.15356/2076-6734-2018-2-231-242 https://doaj.org/article/92a691738faa44dd8d526c8f9955277c |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) |
geographic |
Arctic Laptev Sea Talik |
geographic_facet |
Arctic Laptev Sea Talik |
genre |
Arctic Climate change laptev Laptev Sea permafrost Thermokarst термокарст* |
genre_facet |
Arctic Climate change laptev Laptev Sea permafrost Thermokarst термокарст* |
op_source |
Лëд и снег, Vol 58, Iss 2, Pp 231-242 (2018) |
op_relation |
https://ice-snow.igras.ru/jour/article/view/458 https://doaj.org/toc/2076-6734 https://doaj.org/toc/2412-3765 2076-6734 2412-3765 doi:10.15356/2076-6734-2018-2-231-242 https://doaj.org/article/92a691738faa44dd8d526c8f9955277c |
op_doi |
https://doi.org/10.15356/2076-6734-2018-2-231-242 |
container_title |
Ice and Snow |
container_volume |
58 |
container_issue |
2 |
container_start_page |
231 |
op_container_end_page |
242 |
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1766344500150534144 |