气候变化领域集成服务门户(CCPortal): High methane emissions from thermokarst lakes on the Tibetan Plateau are largely attributed to ebullition fluxes

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DOI	10.1016/j.scitotenv.2021.149692
	High methane emissions from thermokarst lakes on the Tibetan Plateau are largely attributed to ebullition fluxes
	Wang, Lei; Du, Zhiheng; Wei, Zhiqiang; Xu, Qian; Feng, Yaru; Lin, Penglin; Lin, Jiahui; Chen, Shengyun; Qiao, Yongping; Shi, Jianzong; Xiao, Cunde
通讯作者	Xiao, CD (通讯作者)，Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China.
发表日期	2021
ISSN	0048-9697
EISSN	1879-1026
卷号	801
英文摘要	Ebullition has been shown to be an important pathway for methane (CH4) emissions from inland waters. However, the CH4 fluxes and their magnitudes in thermokarst lakes remain unclear due to limited research data, especially on the Tibetan Plateau (TP). The magnitude and regulation of two CH4 pathways, ebullition and diffusion, were investigated in 32 thermokarst lakes on the TP during the summer of 2020. CH4 emissions from thermokarst lakes on the TP showed significant spatiotemporal heterogeneity. Diffusion fluxes in lakes averaged 2.6 mmol m(-2) d(-1) (ranging from 0.003 to 48.4 mmol m(-2) d(-1)), and ebullition fluxes in lakes averaged 6.6 mmol CH4 m(-2) d(-1) (ranging from 0.002 to 140.0 mmol m(-2) d(-1)). Together, these ebullition fluxes contributed 66.1 +/- 24.9% (ranging 5.4 to 100.0%) to the total (diffusion + ebullition) CH4 emissions, indicating the importance of ebullition as a major CH4 transport mechanism on the TP. In general, thermokarst lakes with higher CH4 diffusion fluxes and ebullition fluxes occurred in alpine meadows (2.5 +/- 5.3 mmol m(-2) d(-1); 8.2 +/- 20.6 mmol m(-2) d(-1)), followed by alpine steppes (0.6 +/- 5.3 mmol m(-2) d(-1); 0.7 +/- 10.8 mmol m(-2) d(-1)) and desert steppes (0.2 +/- 0.2 mmol m(-2) d(-1); 0.6 +/- 0.8 mmol m(-2) d(-1)). The organic matter contents in water and sediment were found to be important factors influencing the seasonal variations in CH4 diffusion fluxes. However, the ebullition CH4 fluxes did not show a clear seasonal variation pattern. Our findings highlight the importance of considering the large spatiotemporal variations in ebullition CH4 fluxes to improve the accuracy of large-scale estimations of CH4 fluxes in thermokarst lakes on the TP. Greater insight into these aspects will increase the understanding of CH4 dynamics in thermokarst lakes on the TP, which is essential for forecasting and climate impact assessments and to better constrain feedback to climate warming. (C) 2021 Published by Elsevier B.V.
关键词	CARBON-DIOXIDE FLUXES GREENHOUSE-GAS PRODUCTION MIN RIVER ESTUARY PERMAFROST CARBON NITROUS-OXIDE SPATIOTEMPORAL VARIABILITY SEDIMENT CHARACTERISTICS SPATIAL HETEROGENEITY CH4 CONCENTRATIONS DISSOLVED METHANE
英文关键词	Thermokarst lakes; Vegetation; Methane; Ebullition flux; Spatiotemporal variation; Tibetan Plateau
语种	英语
WOS研究方向	Environmental Sciences & Ecology
WOS类目	Environmental Sciences
WOS记录号	WOS:000704388000012
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254378
作者单位	[Wang, Lei; Feng, Yaru; Lin, Jiahui; Xiao, Cunde] Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China; [Du, Zhiheng; Xu, Qian; Chen, Shengyun] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, State Key Lab Cryospher Sci, Lanzhou 730000, Peoples R China; [Wei, Zhiqiang] Beijing Normal Univ, Zhuhai Branch, State Key Lab Earth Surface Proc & Resource Ecol, Zhuhai 519087, Peoples R China; [Lin, Penglin] Northwest Normal Univ, Coll Geog & Environm Sci, Lanzhou 730070, Peoples R China; [Qiao, Yongping; Shi, Jianzong] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resource, State Key Lab Cryospher Sci, Cryosphere Res Stn Qinghai Tibet Plateau, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Wang, Lei,Du, Zhiheng,Wei, Zhiqiang,et al. High methane emissions from thermokarst lakes on the Tibetan Plateau are largely attributed to ebullition fluxes[J]. 中国科学院西北生态环境资源研究院,2021,801.
APA	Wang, Lei.,Du, Zhiheng.,Wei, Zhiqiang.,Xu, Qian.,Feng, Yaru.,...&Xiao, Cunde.(2021).High methane emissions from thermokarst lakes on the Tibetan Plateau are largely attributed to ebullition fluxes.SCIENCE OF THE TOTAL ENVIRONMENT,801.
MLA	Wang, Lei,et al."High methane emissions from thermokarst lakes on the Tibetan Plateau are largely attributed to ebullition fluxes".SCIENCE OF THE TOTAL ENVIRONMENT 801(2021).