气候变化领域集成服务门户(CCPortal): Proglacial freshwaters are significant and previously unrecognized sinks of atmospheric CO2

CCPortal

DOI	10.1073/pnas.1904241116
	Proglacial freshwaters are significant and previously unrecognized sinks of atmospheric CO2
	St Pierre K.A.; St Louis V.L.; Schiff S.L.; Lehnherr I.; Dainard P.G.; Gardner A.S.; Aukes P.J.K.; Sharp M.J.
发表日期	2019
ISSN	0027-8424
起始页码	17690
结束页码	17695
卷号	116 期号:36
英文摘要	Carbon dioxide (CO2) emissions from freshwater ecosystems are almost universally predicted to increase with climate warming. Glacier-fed rivers and lakes, however, differ critically from those in nonglacierized catchments in that they receive little terrestrial input of organic matter for decomposition and CO2 production, and transport large quantities of easily mobilized comminuted sediments available for carbonate and silicate weathering reactions that can consume atmospheric CO2. We used a whole-watershed approach, integrating concepts from glaciology and limnology, to conclusively show that certain glacier-fed freshwater ecosystems are important and previously overlooked annual CO2 sinks due to the overwhelming influence of these weathering reactions. Using the glacierized Lake Hazen watershed (Nunavut, Canada, 82°N) as a model system, we found that weathering reactions in the glacial rivers actively consumed CO2 up to 42 km downstream of glaciers, and cumulatively transformed the High Arctic's most voluminous lake into an important CO2 sink. In conjunction with data collected at other proglacial freshwater sites in Greenland and the Canadian Rockies, we suggest that CO2 consumption in proglacial freshwaters due to glacial melt-enhanced weathering is likely a globally relevant phenomenon, with potentially important implications for regional annual carbon budgets in glacierized watersheds. © 2019 National Academy of Sciences. All rights reserved.
英文关键词	Biogeochemistry; Carbon; Freshwater; Glacial meltwaters
语种	英语
scopus关键词	carbon dioxide; fresh water; Arctic; Article; Canada; carbon footprint; carbon sink; deglaciation; freshwater environment; glacier; limnology; priority journal; watershed; weathering
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159035
作者单位	St Pierre, K.A., Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada; St Louis, V.L., Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada; Schiff, S.L., Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada; Lehnherr, I., Department of Geography, University of Toronto Mississauga, Mississauga, ON L5L 1C6, Canada; Dainard, P.G., Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada; Gardner, A.S., Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, United States; Aukes, P.J.K., Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada; Sharp, M.J., Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada
推荐引用方式 GB/T 7714	St Pierre K.A.,St Louis V.L.,Schiff S.L.,et al. Proglacial freshwaters are significant and previously unrecognized sinks of atmospheric CO2[J],2019,116(36).
APA	St Pierre K.A..,St Louis V.L..,Schiff S.L..,Lehnherr I..,Dainard P.G..,...&Sharp M.J..(2019).Proglacial freshwaters are significant and previously unrecognized sinks of atmospheric CO2.Proceedings of the National Academy of Sciences of the United States of America,116(36).
MLA	St Pierre K.A.,et al."Proglacial freshwaters are significant and previously unrecognized sinks of atmospheric CO2".Proceedings of the National Academy of Sciences of the United States of America 116.36(2019).