Carbon Isotopic Evidence for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emission in the Muli Permafrost of the Qinghai-Tibet Plateau
In order to determine the significant role of gas hydrate in seasonal wetland methane emission at the drilling-affected permafrost, the carbon isotopic monthly field monitoring of methane (CH(4)), as well as carbon dioxide (CO(2)), emitted from near-surface soil and a gas hydrate drilling well (DK-8...
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ftpubmed:oai:pubmedcentral.nih.gov:8872400 2023-05-15T17:56:58+02:00 Carbon Isotopic Evidence for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emission in the Muli Permafrost of the Qinghai-Tibet Plateau Li, Xiaoqian Xing, Jianwei Pang, Shouji Zhu, Youhai Zhang, Shuai Xiao, Rui Lu, Cheng 2022-02-20 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8872400/ https://doi.org/10.3390/ijerph19042437 en eng MDPI http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8872400/ http://dx.doi.org/10.3390/ijerph19042437 © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). CC-BY Int J Environ Res Public Health Article Text 2022 ftpubmed https://doi.org/10.3390/ijerph19042437 2022-02-27T02:00:39Z In order to determine the significant role of gas hydrate in seasonal wetland methane emission at the drilling-affected permafrost, the carbon isotopic monthly field monitoring of methane (CH(4)), as well as carbon dioxide (CO(2)), emitted from near-surface soil and a gas hydrate drilling well (DK-8) was conducted in the Muli permafrost of the Qinghai-Tibet Plateau. The methane source effused from the well DK-8 was calculated as −25.9 ± 1.4‰ and −26.5 ± 0.5‰, respectively, by the Keeling and Miller Tans plots, with the carbon isotope fractionation (ε(C)) between CO(2) and CH(4) from −25.3‰ to −32.1‰. The carbon isotopic signatures are indicative of thermogenic origin associated with gas hydrate dissociation. The near-surface soil-emitted methane has δ(13)C(CH4) values between −52.0 ± 1.2‰ and −43.2 ± 1.8‰ with the heaviest in December and the lightest in July. Further, the ε(C) values of near-surface soil-emitted gases were between 28.6‰ and 47.9‰, significantly correlated with the δ(13)C(CH4) values. The linear correlation between ε(C) and δ(13)C(CH4) values indicated binary end-member of microbial and thermogenic sources control the seasonal variation of wetland methane emission. The thermogenically derived methane was identified as the dominant methane source in autumn and winter, compared with the increasing contribution of microbially derived methane in spring and summer. The finding provides reliable evidence for gas hydrate release on the seasonal wetland methane emission in the Muli permafrost affected by drilling activities. The combined application of ε(C) and δ(13)C(CH4) to distinguish thermogenic from biogenic methane is well established and powerful in complex environments, which can provide an improved constraint on source apportionment for wetland emitted methane in the permafrost of the Qinghai-Tibet Plateau. Text permafrost PubMed Central (PMC) International Journal of Environmental Research and Public Health 19 4 2437 |
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Article Li, Xiaoqian Xing, Jianwei Pang, Shouji Zhu, Youhai Zhang, Shuai Xiao, Rui Lu, Cheng Carbon Isotopic Evidence for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emission in the Muli Permafrost of the Qinghai-Tibet Plateau |
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Article |
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In order to determine the significant role of gas hydrate in seasonal wetland methane emission at the drilling-affected permafrost, the carbon isotopic monthly field monitoring of methane (CH(4)), as well as carbon dioxide (CO(2)), emitted from near-surface soil and a gas hydrate drilling well (DK-8) was conducted in the Muli permafrost of the Qinghai-Tibet Plateau. The methane source effused from the well DK-8 was calculated as −25.9 ± 1.4‰ and −26.5 ± 0.5‰, respectively, by the Keeling and Miller Tans plots, with the carbon isotope fractionation (ε(C)) between CO(2) and CH(4) from −25.3‰ to −32.1‰. The carbon isotopic signatures are indicative of thermogenic origin associated with gas hydrate dissociation. The near-surface soil-emitted methane has δ(13)C(CH4) values between −52.0 ± 1.2‰ and −43.2 ± 1.8‰ with the heaviest in December and the lightest in July. Further, the ε(C) values of near-surface soil-emitted gases were between 28.6‰ and 47.9‰, significantly correlated with the δ(13)C(CH4) values. The linear correlation between ε(C) and δ(13)C(CH4) values indicated binary end-member of microbial and thermogenic sources control the seasonal variation of wetland methane emission. The thermogenically derived methane was identified as the dominant methane source in autumn and winter, compared with the increasing contribution of microbially derived methane in spring and summer. The finding provides reliable evidence for gas hydrate release on the seasonal wetland methane emission in the Muli permafrost affected by drilling activities. The combined application of ε(C) and δ(13)C(CH4) to distinguish thermogenic from biogenic methane is well established and powerful in complex environments, which can provide an improved constraint on source apportionment for wetland emitted methane in the permafrost of the Qinghai-Tibet Plateau. |
format |
Text |
author |
Li, Xiaoqian Xing, Jianwei Pang, Shouji Zhu, Youhai Zhang, Shuai Xiao, Rui Lu, Cheng |
author_facet |
Li, Xiaoqian Xing, Jianwei Pang, Shouji Zhu, Youhai Zhang, Shuai Xiao, Rui Lu, Cheng |
author_sort |
Li, Xiaoqian |
title |
Carbon Isotopic Evidence for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emission in the Muli Permafrost of the Qinghai-Tibet Plateau |
title_short |
Carbon Isotopic Evidence for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emission in the Muli Permafrost of the Qinghai-Tibet Plateau |
title_full |
Carbon Isotopic Evidence for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emission in the Muli Permafrost of the Qinghai-Tibet Plateau |
title_fullStr |
Carbon Isotopic Evidence for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emission in the Muli Permafrost of the Qinghai-Tibet Plateau |
title_full_unstemmed |
Carbon Isotopic Evidence for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emission in the Muli Permafrost of the Qinghai-Tibet Plateau |
title_sort |
carbon isotopic evidence for gas hydrate release and its significance on seasonal wetland methane emission in the muli permafrost of the qinghai-tibet plateau |
publisher |
MDPI |
publishDate |
2022 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8872400/ https://doi.org/10.3390/ijerph19042437 |
genre |
permafrost |
genre_facet |
permafrost |
op_source |
Int J Environ Res Public Health |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8872400/ http://dx.doi.org/10.3390/ijerph19042437 |
op_rights |
© 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3390/ijerph19042437 |
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International Journal of Environmental Research and Public Health |
container_volume |
19 |
container_issue |
4 |
container_start_page |
2437 |
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1766165303125868544 |