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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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  • Xiaoqian Li

    (The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing 100083, China
    School of Environmental Studies, China University of Geosciences, Wuhan 430074, China)

  • Jianwei Xing

    (School of Environmental Studies, China University of Geosciences, Wuhan 430074, China)

  • Shouji Pang

    (The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing 100083, China
    Oil and Gas Survey, China Geological Survey, Beijing 100083, China)

  • Youhai Zhu

    (The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing 100083, China
    Oil and Gas Survey, China Geological Survey, Beijing 100083, China)

  • Shuai Zhang

    (The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing 100083, China
    Oil and Gas Survey, China Geological Survey, Beijing 100083, China)

  • Rui Xiao

    (The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing 100083, China
    Oil and Gas Survey, China Geological Survey, Beijing 100083, China)

  • Cheng Lu

    (The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey, Beijing 100083, China
    Oil and Gas Survey, China Geological Survey, Beijing 100083, China)

Abstract

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.

Suggested Citation

  • Xiaoqian Li & Jianwei Xing & Shouji Pang & Youhai Zhu & Shuai Zhang & Rui Xiao & Cheng Lu, 2022. "Carbon Isotopic Evidence for Gas Hydrate Release and Its Significance on Seasonal Wetland Methane Emission in the Muli Permafrost of the Qinghai-Tibet Plateau," IJERPH, MDPI, vol. 19(4), pages 1-14, February.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:4:p:2437-:d:753831
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    References listed on IDEAS

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