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The fate of river o...
The fate of river organic carbon in coastal areas : A study in the Rhone River delta using multiple isotopic (delta C-13, Delta C-14) and organic tracers
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Cathalot, C. (author)
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Rabouille, C. (author)
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Tisnerat-Laborde, N. (author)
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Toussaint, F. (author)
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Kerherve, P. (author)
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Buscail, R. (author)
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Loftis, K. (author)
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Sun, M. -Y (author)
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Tronczynski, J. (author)
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Azoury, S. (author)
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Lansard, B. (author)
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Treignier, C. (author)
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Pastor, L. (author)
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- Tesi, Tommaso (author)
- Stockholms universitet,Institutionen för tillämpad miljövetenskap (ITM)
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(creator_code:org_t)
- Elsevier BV, 2013
- 2013
- English.
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In: Geochimica et Cosmochimica Acta. - : Elsevier BV. - 0016-7037 .- 1872-9533. ; 118, s. 33-55
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https://archimer.ifr...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- A significant fraction of the global carbon flux to the ocean occurs in River-dominated Ocean Margins (RiOMar) although large uncertainties remain in the cycle of organic matter (OM) in these systems. In particular, the OM sources and residence time have not been well clarified. Surface (0-1 cm) and sub-surface (3-4 cm) sediments and water column particles (bottom and intermediate depth) from the Rhone River delta system were collected in June 2005 and in April 2007 for a multi-proxy study. Lignin phenols, black carbon (BC), proto-kerogen/BC mixture, polycyclic aromatic hydrocarbons (PAHs), carbon stable isotope (delta C-13(OC)), and radiocarbon measurements (delta C-14(OC)) were carried out to characterize the source of sedimentary organic material and to address degradation and transport processes. The bulk OM in the prodelta sediment appears to have a predominantly modern terrigenous origin with a significant contribution of modern vascular C-3 plant detritus (Delta C-14(OC) = 27.9 parts per thousand, delta C-13(OC) = -27.4 parts per thousand). In contrast, the adjacent continental shelf, below the river plume, seems to be dominated by aged OM (Delta C-14(OC) = -400 parts per thousand, delta C-13(OC) = -24.2 parts per thousand), and shows no evidence of dilution and/or replacement by freshly produced marine carbon. Our data suggest an important contribution of black carbon (50% of OC) in the continental shelf sediments. Selective degradation processes occur along the main dispersal sediment system, promoting the loss of a modern terrestrial OM but also proto-kerogen-like OM. In addition, we hypothesize that during the transport across the shelf, a long term resuspension/deposition loop induces efficient long term degradation processes able to rework such refractory-like material until the OC is protected by the mineral matrix of particles.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geokemi (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geochemistry (hsv//eng)
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- ref (subject category)
- art (subject category)
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- By the author/editor
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Cathalot, C.
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Rabouille, C.
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Tisnerat-Laborde ...
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Toussaint, F.
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Kerherve, P.
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Buscail, R.
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show more...
-
Loftis, K.
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Sun, M. -Y
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Tronczynski, J.
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Azoury, S.
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Lansard, B.
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Treignier, C.
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Pastor, L.
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Tesi, Tommaso
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geophysics
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Earth and Relate ...
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and Geochemistry
- Articles in the publication
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Geochimica et Co ...
- By the university
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Stockholm University