The significant contribution of lake depth in regulating global lake diffusive methane emissions

doi:10.1016/j.watres.2020.115465

	The significant contribution of lake depth in regulating global lake diffusive methane emissions
	Li, Mingxu 1,3,5; Peng, Changhui 3,5; Zhu, Qiuan 5; Zhou, Xiaolu 5; Yang, Gang 6; Song, Xinzhang 2; Zhang, Kerou 4
刊名	WATER RESEARCH
	2020-04-01
卷号	172 页码:10
关键词	Global methane estimation Lake CH4 diffusion Maximum depth Surface area Freshwaters GHGs emissions
ISSN号	0043-1354
DOI	10.1016/j.watres.2020.115465
通讯作者	Peng, Changhui(peng.changhui@uqam.ca)
英文摘要	Global lakes have been identified as an important component of natural methane (CH4) sources. Given that lake CH4 emissions involve multiple, complex processes influenced by various environmental factors, estimates of global lake CH4 emissions are largely uncertain. In this study, we compiled global CH4 emission data on 744 lakes from published studies, and found a significantly negative correlation (R-2 = 0.50, p < 0.01) between diffusive CH4 flux and lake maximum depth. Further analysis indicated that no significant differences in global sediment CH4 production were found for the different maximum depths investigated. Owing to the longer oxidation pathway, presence of oxycline layer, and the lower nutrient environment, deeper lakes yield less diffusive CH4 efflux compared to shallower lakes. Additionally, we also found that lake area was negatively correlated (R-2 = 0.13, p < 0.01) to diffusive CH4 flux. Therefore, based on empirical correlations between lake morphometry (maximum depth and area) and diffusive CH4 emission, as well as the combination of two lake databases, we estimated that the annual diffusive CH4 emission from global lakes is approximately 11.2 (6.2-19.5) Tg CH4/yr, and greater than 84% is emitted from lakes with a mean depth of less than 5 m. Furthermore, two regions, 40-70 degrees N (30.4%) and 20 degrees S similar to 10 degrees N (37.4%), were found to be the dominant contributors of global lake diffusive CH4 emissions, resulting from the considerable total lake area and the extensive shallow lakes in these regions. This study highlights the significance of the 'depth-effect' which controls the spatial distribution of lake diffusive CH4 flux and allows for the quantification of global lake diffusive CH4 emissions. (C) 2020 Elsevier Ltd. All rights reserved.
资助项目	National Key R&D Program of China, China[2016YFC0500203] ; Natural Sciences and Engineering Research Council of Canada (NSERC), Canada ; National Natural Science Foundation of China[31988102] ; Chinese Academy of Sciences Strategic Priority Research Program[XDA23080401]
WOS关键词	GREENHOUSE-GAS EMISSIONS ; RIVER FLOODPLAIN ; NORTHERN LAKES ; CARBON-DIOXIDE ; SURFACE-WATER ; BOREAL LAKES ; OXIDATION ; PONDS ; SIZE ; EBULLITION
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000517663600023
资助机构	National Key R&D Program of China, China ; Natural Sciences and Engineering Research Council of Canada (NSERC), Canada ; National Natural Science Foundation of China ; Chinese Academy of Sciences Strategic Priority Research Program
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/132874]
专题	中国科学院地理科学与资源研究所
通讯作者	Peng, Changhui
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing 100101, Peoples R China 2.Zhejiang A&F Univ, Nurturing Stn, State Key Lab Subtrop Silviculture, Linan 311300, Peoples R China 3.Univ Quebec Montreal, Inst Environm Sci, Dept Biol Sci, CP 8888, Montreal, PQ H3C 3P8, Canada 4.Chinese Acad Forestry, Inst Wetland Res, Beijing 100091, Peoples R China 5.Northwest A&F Univ, Coll Forestry, Ctr Ecol Forecasting & Global Change, Yangling 712100, Shaanxi, Peoples R China 6.Southwest Univ Sci & Technol, Sch Life Sci & Engn, Mianyang 621010, Sichuan, Peoples R China
推荐引用方式 GB/T 7714	Li, Mingxu,Peng, Changhui,Zhu, Qiuan,et al. The significant contribution of lake depth in regulating global lake diffusive methane emissions[J]. WATER RESEARCH,2020,172:10.
APA	Li, Mingxu.,Peng, Changhui.,Zhu, Qiuan.,Zhou, Xiaolu.,Yang, Gang.,...&Zhang, Kerou.(2020).The significant contribution of lake depth in regulating global lake diffusive methane emissions.WATER RESEARCH,172,10.
MLA	Li, Mingxu,et al."The significant contribution of lake depth in regulating global lake diffusive methane emissions".WATER RESEARCH 172(2020):10.