DOI: 10.1029/2018JG004622
Scopus记录号: 2-s2.0-85052445907
论文题名: Carbon Dioxide and Methane Dynamics in a Small Boreal Lake During Winter and Spring Melt Events
作者: Denfeld B.A. ; Klaus M. ; Laudon H. ; Sponseller R.A. ; Karlsson J.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 8 起始页码: 2527
结束页码: 2540
语种: 英语
英文关键词: carbon cycle
; carbon dioxide
; emissions
; ice-covered lake
; methane
; winter limnology
英文摘要: In seasonally ice-covered lakes, carbon dioxide (CO2) and methane (CH4) emission at ice-off can account for a significant fraction of the annual budget. Yet knowledge of the mechanisms controlling below lake-ice carbon (C) dynamics and subsequent CO2 and CH4 emissions at ice-off is limited. To understand the control of below ice C dynamics, and C emissions in spring, we measured spatial variation in CO2, CH4, and dissolved inorganic and organic carbon from ice-on to ice-off, in a small boreal lake during a winter with sporadic melting events. Winter melt events were associated with decreased surface water DOC in the forest-dominated basin and increased surface water CH4 in the mire-dominated basin. At the whole-lake scale, CH4 accumulated below ice throughout the winter, whereas CO2 accumulation was greatest in early winter. Mass-balance estimates suggest that, in addition to the CO2 and CH4 accumulated during winter, external inputs of CO2 and CH4 and internal processing during ice-melt could represent significant sources of C gas emissions during ice-off. Moreover, internal processing of CO2 and CH4 worked in opposition, with production of CO2 and oxidation of CH4 dominating at ice-off. These findings have important implications for how small boreal lakes will respond to warmer winters in the future; increased winter melt events will likely increase external inputs below ice and thus alter the extent and timing of CO2 and CH4 emissions to the atmosphere at ice-off. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113310
Appears in Collections: 气候减缓与适应
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作者单位: Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden; Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden; Climate Impacts Research Centre, Department of Ecology and Environmental Science, Umeå University, Umeå, Sweden
Recommended Citation:
Denfeld B.A.,Klaus M.,Laudon H.,et al. Carbon Dioxide and Methane Dynamics in a Small Boreal Lake During Winter and Spring Melt Events[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(8)