DOI: 10.1029/2018JG004506
Scopus记录号: 2-s2.0-85049826802
论文题名: Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO2 in Productive Hardwater Lakes
作者: Wiik E. ; Haig H.A. ; Hayes N.M. ; Finlay K. ; Simpson G.L. ; Vogt R.J. ; Leavitt P.R.
刊名: Journal of Geophysical Research: Biogeosciences
ISSN: 21698953
出版年: 2018
卷: 123, 期: 6 起始页码: 1940
结束页码: 1959
语种: 英语
英文关键词: algae
; carbon dioxide
; CO2
; eutrophication
; hardwater
; lake
Scopus关键词: additive
; alga
; allochthon
; annual variation
; atmosphere-hydrosphere interaction
; atmospheric gas
; carbon cycle
; climate modeling
; concentration (composition)
; dissolved organic nitrogen
; eutrophication
; lake water
; metabolism
; prairie
; prediction
; spatiotemporal analysis
; Canada
; algae
英文摘要: Spatiotemporal variation in climate and weather, allochthonous carbon loads, and autochthonous factors such as lake metabolism (photosynthesis and respiration) interacts to regulate atmospheric CO2 exchange of lakes. Understanding this interplay in diverse basin types at different timescales is required to adequately place lakes into the global carbon cycle and predict CO2 flux through space and time. We analyzed 18 years of data from seven moderately hard lakes in an agricultural prairie landscape in central Canada. We applied generalized additive models and sensitivity analyses to evaluate the roles of metabolic and climatic drivers in regulating CO2 flux at the intra-annual scale. At mean conditions with respect to other predictors, metabolic controls resulted in uptake of atmospheric CO2 when surface waters exhibited moderate primary production but released CO2 only when primary production was very low (<8 μg/L or when dissolved nitrogen was elevated (>2,000 μg/L), implying that respiratory controls offset photosynthetic CO2 uptake under these conditions. Climatically, dry conditions increased the likelihood of in-gassing, likely due to evaporative concentration of base cations and/or reduced allochthonous carbon loads. While more research is required to establish the relative importance of climate and metabolism at other timescales (diel, autumn/winter), we conclude that these hard fresh waters characteristic of continental interiors are mainly affected by metabolic drivers of pCO2 at daily-monthly timescales, are climatically controlled at interannual intervals, and are more likely to in-gas CO2 for a given level of algal abundance than are soft water, boreal ecosystems. ©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/113742
Appears in Collections: 气候减缓与适应
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作者单位: Limnology Laboratory, Department of Biology, University of Regina, Regina, SK, Canada; School of Environment, Natural Resources and Geography, Bangor University, Bangor, United Kingdom; Institute of Environmental Change and Society, University of Regina, Regina, SK, Canada; Pavillon des sciences biologiques, Université du Québec à Montréal, Montréal, QC, Canada; Institute for Global Food Security Queen's University Belfast, Belfast, United Kingdom
Recommended Citation:
Wiik E.,Haig H.A.,Hayes N.M.,et al. Generalized Additive Models of Climatic and Metabolic Controls of Subannual Variation in pCO2 in Productive Hardwater Lakes[J]. Journal of Geophysical Research: Biogeosciences,2018-01-01,123(6)