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The fate of river organic carbon in coastal areas: A study in the Rhône River delta using multiple isotopic (δ13C, °14C) and organic tracers.

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Title: The fate of river organic carbon in coastal areas: A study in the Rhône River delta using multiple isotopic (δ13C, °14C) and organic tracers.
Authors: Cathalot, C.1 Cecile.Cathalot@ifremer.fr, Rabouille, C.1, Tisnérat-Laborde, N.1, Toussaint, F.1, Kerhervé, P.2,3, Buscail, R.2,3, Loftis, K.4, Sun, M.-Y.4, Tronczynski, J.5, Azoury, S.5, Lansard, B.1, Treignier, C.1, Pastor, L.6, Tesi, T.7,8
Source: Geochimica et Cosmochimica Acta. Oct2013, Vol. 118, p33-55. 23p.
Subjects: Organic compounds, Coastal sediments, Carbon, River deltas, Stable isotope tracers, Carbon cycle, Polycyclic aromatic hydrocarbons
Abstract: Abstract: 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 (0–1cm) and sub-surface (3–4cm) sediments and water column particles (bottom and intermediate depth) from the Rhône 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 (δ13COC), and radiocarbon measurements (Δ14COC) 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 C3 plant detritus (Δ14COC =27.9‰, δ13COC =−27.4‰). In contrast, the adjacent continental shelf, below the river plume, seems to be dominated by aged OM (Δ14COC =−400‰, δ13COC =−24.2‰), 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. [Copyright &y& Elsevier]
Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: The fate of river organic carbon in coastal areas: A study in the Rhône River delta using multiple isotopic (δ<superscript>13</superscript>C, °<superscript>14</superscript>C) and organic tracers.
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  Data: <searchLink fieldCode="AR" term="%22Cathalot%2C+C%2E%22">Cathalot, C.</searchLink><relatesTo>1</relatesTo><i> Cecile.Cathalot@ifremer.fr</i><br /><searchLink fieldCode="AR" term="%22Rabouille%2C+C%2E%22">Rabouille, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Tisnérat-Laborde%2C+N%2E%22">Tisnérat-Laborde, N.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Toussaint%2C+F%2E%22">Toussaint, F.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Kerhervé%2C+P%2E%22">Kerhervé, P.</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Buscail%2C+R%2E%22">Buscail, R.</searchLink><relatesTo>2,3</relatesTo><br /><searchLink fieldCode="AR" term="%22Loftis%2C+K%2E%22">Loftis, K.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Sun%2C+M%2E-Y%2E%22">Sun, M.-Y.</searchLink><relatesTo>4</relatesTo><br /><searchLink fieldCode="AR" term="%22Tronczynski%2C+J%2E%22">Tronczynski, J.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Azoury%2C+S%2E%22">Azoury, S.</searchLink><relatesTo>5</relatesTo><br /><searchLink fieldCode="AR" term="%22Lansard%2C+B%2E%22">Lansard, B.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Treignier%2C+C%2E%22">Treignier, C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Pastor%2C+L%2E%22">Pastor, L.</searchLink><relatesTo>6</relatesTo><br /><searchLink fieldCode="AR" term="%22Tesi%2C+T%2E%22">Tesi, T.</searchLink><relatesTo>7,8</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Geochimica+et+Cosmochimica+Acta%22">Geochimica et Cosmochimica Acta</searchLink>. Oct2013, Vol. 118, p33-55. 23p.
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  Data: <searchLink fieldCode="DE" term="%22Organic+compounds%22">Organic compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Coastal+sediments%22">Coastal sediments</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon%22">Carbon</searchLink><br /><searchLink fieldCode="DE" term="%22River+deltas%22">River deltas</searchLink><br /><searchLink fieldCode="DE" term="%22Stable+isotope+tracers%22">Stable isotope tracers</searchLink><br /><searchLink fieldCode="DE" term="%22Carbon+cycle%22">Carbon cycle</searchLink><br /><searchLink fieldCode="DE" term="%22Polycyclic+aromatic+hydrocarbons%22">Polycyclic aromatic hydrocarbons</searchLink>
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  Label: Abstract
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  Data: Abstract: 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 (0–1cm) and sub-surface (3–4cm) sediments and water column particles (bottom and intermediate depth) from the Rhône 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 (δ13COC), and radiocarbon measurements (Δ14COC) 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 C3 plant detritus (Δ14COC =27.9‰, δ13COC =−27.4‰). In contrast, the adjacent continental shelf, below the river plume, seems to be dominated by aged OM (Δ14COC =−400‰, δ13COC =−24.2‰), 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. [Copyright &y& Elsevier]
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  Data: <i>Copyright of Geochimica et Cosmochimica Acta is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1016/j.gca.2013.05.001
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        Text: English
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        PageCount: 23
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    Subjects:
      – SubjectFull: Organic compounds
        Type: general
      – SubjectFull: Coastal sediments
        Type: general
      – SubjectFull: Carbon
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      – SubjectFull: River deltas
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      – SubjectFull: Stable isotope tracers
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      – SubjectFull: Carbon cycle
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      – SubjectFull: Polycyclic aromatic hydrocarbons
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