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A model for inferri...
A model for inferring dissolved organic carbon (DOC) in lakewater from visible-near-infrared spectroscopy (VNIRS) measures in lake sediment
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- Rouillard, Alexandra (författare)
- Paleoecological Environmental Assessment and Research Laboratory, Department of Biology, Queen’s University, Kingston, Canada
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- Rosén, Peter (författare)
- Umeå universitet,Institutionen för ekologi, miljö och geovetenskap
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- Douglas, Marianne S V (författare)
- Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Canada
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- Pienitz, Reinhard (författare)
- Aquatic Paleoecology Laboratory, Centre d’Études Nordiques (CEN), Université Laval, Québec, Canada
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- Smol, John P (författare)
- Paleoecological Environmental Assessment and Research Laboratory, Department of Biology, Queen’s University, Kingston, Canada
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(creator_code:org_t)
- 2011-05-25
- 2011
- Engelska.
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Ingår i: Journal of Paleolimnology. - : Springer. - 0921-2728 .- 1573-0417. ; 46:2, s. 187-202
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We developed an inference model to infer dissolved organic carbon (DOC) in lakewater from lake sediments using visible-near-infrared spectroscopy (VNIRS). The inference model used surface sediment samples collected from 160 Arctic Canada lakes, covering broad latitudinal (60–83°N), longitudinal (71–138°W) and environmental gradients, with a DOC range of 0.6–39.6 mg L−1. The model was applied to Holocene lake sediment cores from Sweden and Canada and our inferences are compared to results from previous multiproxy paleolimnological investigations at these two sites. The inferred Swedish and Canadian DOC profiles are compared, respectively, to inferences from a Swedish-based VNIRS-total organic carbon (TOC) model and a Canadian-based diatom-inferred (Di-DOC) model from the same sediment records. The 5-component Partial Least Squares (PLS) model yields a cross-validated (CV) R2CV = 0.61 and a root mean squared error of prediction (RMSEP CV ) = 4.4 mg L−1 (11% of DOC gradient). The trends inferred for the two lakes were remarkably similar to the VNIRS-TOC and the Di-DOC inferred profiles and consistent with the other paleolimnological proxies, although absolute values differed. Differences in the calibration set gradients and lack of analogous VNIRS signatures in the modern datasets may explain this discrepancy. Our results corroborate previous geographically independent studies on the potential of using VNIRS to reconstruct past trends in lakewater DOC concentrations rapidly.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Nyckelord
- Visible-near-infrared spectroscopy
- Dissolved organic carbon
- Arctic
- Paleolimnology
- Paleo-optics
- Carbon cycling
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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