globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2012.07.016
Scopus记录号: 2-s2.0-84881373038
论文题名:
Carbon cycling within an East African lake revealed by the carbon isotope composition of diatom silica: A 25-ka record from Lake Challa, Mt. Kilimanjaro
作者: Barker P.A.; Hurrell E.R.; Leng M.J.; Plessen B.; Wolff C.; Conley D.J.; Keppens E.; Milne I.; Cumming B.F.; Laird K.R.; Kendrick C.P.; Wynn P.M.; Verschuren D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 66
起始页码: 55
结束页码: 63
语种: 英语
英文关键词: Carbon isotopes ; Diatom frustule carbon ; East Africa ; Lake carbon cycle ; Lake Challa ; Palaeoclimate
Scopus关键词: Carbon cycles ; Carbon isotope composition ; Carbon isotopes ; Dissolved inorganic carbon ; East Africa ; Palaeoclimate ; Positive correlations ; Sediment organic matters ; Biogeochemistry ; Biological materials ; Catchments ; Digital storage ; Economics ; Isotopes ; Lakes ; Organic compounds ; Productivity ; Sediments ; Silica ; Carbon ; alga ; biological production ; carbon cycle ; carbon isotope ; diatom ; dissolved inorganic carbon ; isotopic composition ; lacustrine deposit ; paleoclimate ; silica ; Kilimanjaro [Tanzania] ; Lake Challa ; Tanzania ; algae ; Bacillariophyta
英文摘要: The carbon cycle of a lake is a balance between supply from the atmosphere and catchment, and the net demand exerted by primary producers, minus losses back to the atmosphere and to sediment storage. Evaluating the sum of these processes and reconstructing them from sediment records of lake history requires a range of methods and a multi-proxy approach. One promising technique is to explore the carbon-isotope composition (δ13Cdiatom) of organic matter incorporated within the silica frustules of diatom algae. Here we present a 25,000-year record of δ13Cdiatom from the sediments of crater Lake Challa on the eastern flank of Mt. Kilimanjaro, and along with other proxy data we make inferences about the three major phases in the history of the lake's carbon cycle. From 25 ka to 15.8 ka years BP, δ13Cdiatom is positively correlated with the δ13C of bulk sediment organic matter (δ13Cbulk), indicating that high diatom productivity, as recorded by high % biogenic silica at this time, was preferentially removing 12C and enriching the δ13C of lake-water dissolved inorganic carbon. From 15.8 to 5.5 ka the correlation between δ13Cdiatom and δ13Cbulk breaks down, suggesting carbon supply to the lake satisfied or exceeded the demand from productivity. From 5.5 ka BP the positive correlation resumes, indicating an increase in the internal demand for carbon relative to external supply. Diatom frustule-bound carbon isotopes offer an original tool in examining long-term fluctuations in a lake's carbon budget and how the balance between supply and demand has changed through time. © 2012 Elsevier Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60760
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作者单位: Lancaster Environment Centre, Lancaster University, Lancaster LA1 4YQ, United Kingdom; Department of Geology, University of Leicester, Leicester LE1 7RH, United Kingdom; NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, United Kingdom; Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences, Section 5.2, Climate Dynamics and Landscape Evolution, Telegrafenberg, D-14473 Potsdam, Germany; GeoBiosphere Science Centre, Department of Geology, Lund University, SE-223 62 Lund, Sweden; Department of Geology, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium; Paleoecological Environmental Assessment and Research Laboratory, Queen's University, Kingston, ON K7L 3N6, Canada; Limnology Unit, Department of Biology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium

Recommended Citation:
Barker P.A.,Hurrell E.R.,Leng M.J.,et al. Carbon cycling within an East African lake revealed by the carbon isotope composition of diatom silica: A 25-ka record from Lake Challa, Mt. Kilimanjaro[J]. Quaternary Science Reviews,2013-01-01,66
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