Methane Content in Ground Ice and Sediments of the Kara Sea Coast
Permafrost degradation of coastal and marine sediments of the Arctic Seas can result in large amounts of methane emitted to the atmosphere. The quantitative assessment of such emissions requires data on variability of methane content in various types of permafrost strata. To evaluate the methane con...
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ftmdpi:oai:mdpi.com:/2076-3263/8/12/434/ 2023-08-20T04:04:18+02:00 Methane Content in Ground Ice and Sediments of the Kara Sea Coast Irina D. Streletskaya Alexander A. Vasiliev Gleb E. Oblogov Dmitry A. Streletskiy agris 2018-11-23 application/pdf https://doi.org/10.3390/geosciences8120434 EN eng Multidisciplinary Digital Publishing Institute https://dx.doi.org/10.3390/geosciences8120434 https://creativecommons.org/licenses/by/4.0/ Geosciences; Volume 8; Issue 12; Pages: 434 ground ice permafrost methane Kara Sea Arctic Text 2018 ftmdpi https://doi.org/10.3390/geosciences8120434 2023-07-31T21:51:44Z Permafrost degradation of coastal and marine sediments of the Arctic Seas can result in large amounts of methane emitted to the atmosphere. The quantitative assessment of such emissions requires data on variability of methane content in various types of permafrost strata. To evaluate the methane concentrations in sediments and ground ice of the Kara Sea coast, samples were collected at a series of coastal exposures. Methane concentrations were determined for more than 400 samples taken from frozen sediments, ground ice and active layer. In frozen sediments, methane concentrations were lowest in sands and highest in marine clays. In ground ice, the highest concentrations above 500 ppmV and higher were found in massive tabular ground ice, with much lower methane concentrations in ground ice wedges. The mean isotopic composition of methane is −68.6‰ in permafrost and −63.6‰ in the active layer indicative of microbial genesis. The isotopic compositions of the active layer is enriched relative to permafrost due to microbial oxidation and become more depleted with depth. Ice-rich sediments of Kara Sea coasts, especially those with massive tabular ground ice, hold large amounts of methane making them potential sources of methane emissions under projected warming temperatures and increasing rates of coastal erosion. Text Arctic Ice Kara Sea permafrost wedge* MDPI Open Access Publishing Arctic Kara Sea Geosciences 8 12 434 |
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Open Polar |
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MDPI Open Access Publishing |
op_collection_id |
ftmdpi |
language |
English |
topic |
ground ice permafrost methane Kara Sea Arctic |
spellingShingle |
ground ice permafrost methane Kara Sea Arctic Irina D. Streletskaya Alexander A. Vasiliev Gleb E. Oblogov Dmitry A. Streletskiy Methane Content in Ground Ice and Sediments of the Kara Sea Coast |
topic_facet |
ground ice permafrost methane Kara Sea Arctic |
description |
Permafrost degradation of coastal and marine sediments of the Arctic Seas can result in large amounts of methane emitted to the atmosphere. The quantitative assessment of such emissions requires data on variability of methane content in various types of permafrost strata. To evaluate the methane concentrations in sediments and ground ice of the Kara Sea coast, samples were collected at a series of coastal exposures. Methane concentrations were determined for more than 400 samples taken from frozen sediments, ground ice and active layer. In frozen sediments, methane concentrations were lowest in sands and highest in marine clays. In ground ice, the highest concentrations above 500 ppmV and higher were found in massive tabular ground ice, with much lower methane concentrations in ground ice wedges. The mean isotopic composition of methane is −68.6‰ in permafrost and −63.6‰ in the active layer indicative of microbial genesis. The isotopic compositions of the active layer is enriched relative to permafrost due to microbial oxidation and become more depleted with depth. Ice-rich sediments of Kara Sea coasts, especially those with massive tabular ground ice, hold large amounts of methane making them potential sources of methane emissions under projected warming temperatures and increasing rates of coastal erosion. |
format |
Text |
author |
Irina D. Streletskaya Alexander A. Vasiliev Gleb E. Oblogov Dmitry A. Streletskiy |
author_facet |
Irina D. Streletskaya Alexander A. Vasiliev Gleb E. Oblogov Dmitry A. Streletskiy |
author_sort |
Irina D. Streletskaya |
title |
Methane Content in Ground Ice and Sediments of the Kara Sea Coast |
title_short |
Methane Content in Ground Ice and Sediments of the Kara Sea Coast |
title_full |
Methane Content in Ground Ice and Sediments of the Kara Sea Coast |
title_fullStr |
Methane Content in Ground Ice and Sediments of the Kara Sea Coast |
title_full_unstemmed |
Methane Content in Ground Ice and Sediments of the Kara Sea Coast |
title_sort |
methane content in ground ice and sediments of the kara sea coast |
publisher |
Multidisciplinary Digital Publishing Institute |
publishDate |
2018 |
url |
https://doi.org/10.3390/geosciences8120434 |
op_coverage |
agris |
geographic |
Arctic Kara Sea |
geographic_facet |
Arctic Kara Sea |
genre |
Arctic Ice Kara Sea permafrost wedge* |
genre_facet |
Arctic Ice Kara Sea permafrost wedge* |
op_source |
Geosciences; Volume 8; Issue 12; Pages: 434 |
op_relation |
https://dx.doi.org/10.3390/geosciences8120434 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3390/geosciences8120434 |
container_title |
Geosciences |
container_volume |
8 |
container_issue |
12 |
container_start_page |
434 |
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1774714687765610496 |