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Research Article
Shouji Pang
The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey
Corresponding Author
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Wetland methane emissions in the permafrost regions of the Qinghai-Tibet Plateau is more sensitive to climate warming and can result in a positive climate feedback. Natural gas hydrate, as a potential methane source, may play a pivotal role in wetland methane emission in the permafrost regions. However, it was lacking of evidence. To determine the role of gas hydrate release in wetland methane emission, the two-year field monitoring of methane emitted from a hydrate drilling well, in near-surface soil free gas and low-level air was conducted at a typical gas hydrate reservior in the Qilian Mountains permafrost. The carbon isotope fractionation between CO2 and CH4 (εC) associated with carbon isotopic composition of methane (δ13CCH4) is used as a good tracer to identify methane sources of thermogenic origin or of microbial origin. The monitoring results of the gas hydrate drilling well DK-8 indicated a notable release of the deep gas hydrates occurred in April- May and resulted in the increase of methane content in low-level air. The significance of gas hydrate release in the permafrost region on local wetland methane emission as well as low-level air methane was confirmed by the seasonal variation of methane source of near-surface soil fluxes and low-level air. The thermogenically derived methane were identified as the dominant methane source in autumn and winter compared with increasing contribution of microbially derived methane in summer. The carbon isotopic signatures of tracing methane sources can provide more reliable evidence for gas hydrate release and its effect on the wetland methane emission in the Qilian Mountains permafrost.
Keywords
Carbon isotopic, emissions, Qilian Mountains
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No competing interests reported.
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Reviewer #1 agreed
On 17 Mar, 2021
Reviewer #2 agreed
On 17 Mar, 2021
Reviewer #10 agreed
On 17 Mar, 2021
Reviewer #7 agreed
On 17 Mar, 2021
Reviewer #3 agreed
On 17 Mar, 2021
Reviewer #4 agreed
On 17 Mar, 2021
Reviewer #5 agreed
On 17 Mar, 2021
Reviewer #9 agreed
On 17 Mar, 2021
Reviewer #8 agreed
On 17 Mar, 2021
Reviewer #6 agreed
On 17 Mar, 2021
Reviewers invited
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Editor invited
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This preprint is under consideration at Scientific Reports. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research Article
Shouji Pang
The Key Laboratory of Unconventional Oil & Gas Geology, China Geological Survey
Corresponding Author
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Under Revision
Version 1
Posted 04 Mar, 2021
No community comments so far
Editorial decision: Major revision
On 06 Apr, 2021
Review #6 received
Received 26 Mar, 2021
Review #3 received
Received 26 Mar, 2021
Review #1 received
Received 26 Mar, 2021
Review #5 received
Received 26 Mar, 2021
Review #4 received
Received 26 Mar, 2021
Review #2 received
Received 26 Mar, 2021
Reviewer #1 agreed
On 17 Mar, 2021
Reviewer #2 agreed
On 17 Mar, 2021
Reviewer #10 agreed
On 17 Mar, 2021
Reviewer #7 agreed
On 17 Mar, 2021
Reviewer #3 agreed
On 17 Mar, 2021
Reviewer #4 agreed
On 17 Mar, 2021
Reviewer #5 agreed
On 17 Mar, 2021
Reviewer #9 agreed
On 17 Mar, 2021
Reviewer #8 agreed
On 17 Mar, 2021
Reviewer #6 agreed
On 17 Mar, 2021
Reviewers invited
Invitations sent on 16 Mar, 2021
Editor assigned
On 10 Mar, 2021
Editor invited
On 26 Feb, 2021
Submission checks complete
On 26 Feb, 2021
First submitted
On 21 Feb, 2021
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Wetland methane emissions in the permafrost regions of the Qinghai-Tibet Plateau is more sensitive to climate warming and can result in a positive climate feedback. Natural gas hydrate, as a potential methane source, may play a pivotal role in wetland methane emission in the permafrost regions. However, it was lacking of evidence. To determine the role of gas hydrate release in wetland methane emission, the two-year field monitoring of methane emitted from a hydrate drilling well, in near-surface soil free gas and low-level air was conducted at a typical gas hydrate reservior in the Qilian Mountains permafrost. The carbon isotope fractionation between CO2 and CH4 (εC) associated with carbon isotopic composition of methane (δ13CCH4) is used as a good tracer to identify methane sources of thermogenic origin or of microbial origin. The monitoring results of the gas hydrate drilling well DK-8 indicated a notable release of the deep gas hydrates occurred in April- May and resulted in the increase of methane content in low-level air. The significance of gas hydrate release in the permafrost region on local wetland methane emission as well as low-level air methane was confirmed by the seasonal variation of methane source of near-surface soil fluxes and low-level air. The thermogenically derived methane were identified as the dominant methane source in autumn and winter compared with increasing contribution of microbially derived methane in summer. The carbon isotopic signatures of tracing methane sources can provide more reliable evidence for gas hydrate release and its effect on the wetland methane emission in the Qilian Mountains permafrost.
Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
Figure 8
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