Constraining Instantaneous Fluxes and Integrated Compositions of Fluvially Discharged Organic Matter
Abstract Fluvial export of organic carbon (OC) and burial in ocean sediments comprises an important carbon sink, but fluxes remain poorly constrained, particularly for specific organic components. Here OC and lipid biomarker contents and isotopic characteristics of suspended matter determined in dep...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-08-01
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| Series: | Geochemistry, Geophysics, Geosystems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2018GC007539 |
| _version_ | 1797351771961556992 |
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| author | Chantal V. Freymond Maarten Lupker Francien Peterse Negar Haghipour Lukas Wacker Florin Filip Liviu Giosan Timothy I. Eglinton |
| author_facet | Chantal V. Freymond Maarten Lupker Francien Peterse Negar Haghipour Lukas Wacker Florin Filip Liviu Giosan Timothy I. Eglinton |
| author_sort | Chantal V. Freymond |
| collection | DOAJ |
| description | Abstract Fluvial export of organic carbon (OC) and burial in ocean sediments comprises an important carbon sink, but fluxes remain poorly constrained, particularly for specific organic components. Here OC and lipid biomarker contents and isotopic characteristics of suspended matter determined in depth profiles across an active channel close to the terminus of the Danube River are used to constrain instantaneous OC and biomarker fluxes and integrated compositions during high to moderate discharges. During high (moderate) discharge, the total Danube exports 8 (7) kg/s OC, 7 (3) g/s higher plant‐derived long‐chain fatty acids (LCFA), 34 (21) g/s short‐chain fatty acids (SCFA), and 0.5 (0.2) g/s soil bacterial membrane lipids (brGDGTs). Integrated stable carbon isotopic compositions were TOC: −28.0 (−27.6)‰, LCFA: −33.5 (−32.8)‰ and Δ14C TOC: −129 (−38)‰, LCFA: −134 (−143)‰, respectively. Such estimates will aid in establishing quantitative links between production, export, and burial of OC from the terrestrial biosphere. |
| first_indexed | 2024-03-08T13:06:18Z |
| format | Article |
| id | doaj.art-8f01feb3367a4915b30fa0fab61ee6ca |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-03-08T13:06:18Z |
| publishDate | 2018-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-8f01feb3367a4915b30fa0fab61ee6ca2024-01-18T19:36:25ZengWileyGeochemistry, Geophysics, Geosystems1525-20272018-08-011982453246210.1029/2018GC007539Constraining Instantaneous Fluxes and Integrated Compositions of Fluvially Discharged Organic MatterChantal V. Freymond0Maarten Lupker1Francien Peterse2Negar Haghipour3Lukas Wacker4Florin Filip5Liviu Giosan6Timothy I. Eglinton7Geological Institute, ETH Zürich Zürich SwitzerlandGeological Institute, ETH Zürich Zürich SwitzerlandGeological Institute, ETH Zürich Zürich SwitzerlandGeological Institute, ETH Zürich Zürich SwitzerlandIon Beam Physics, ETH Zürich Zürich SwitzerlandInstitute for Fluvial and Marine Systems Bucharest RomaniaWoods Hole Oceanographic Institution Woods Hole MA USAGeological Institute, ETH Zürich Zürich SwitzerlandAbstract Fluvial export of organic carbon (OC) and burial in ocean sediments comprises an important carbon sink, but fluxes remain poorly constrained, particularly for specific organic components. Here OC and lipid biomarker contents and isotopic characteristics of suspended matter determined in depth profiles across an active channel close to the terminus of the Danube River are used to constrain instantaneous OC and biomarker fluxes and integrated compositions during high to moderate discharges. During high (moderate) discharge, the total Danube exports 8 (7) kg/s OC, 7 (3) g/s higher plant‐derived long‐chain fatty acids (LCFA), 34 (21) g/s short‐chain fatty acids (SCFA), and 0.5 (0.2) g/s soil bacterial membrane lipids (brGDGTs). Integrated stable carbon isotopic compositions were TOC: −28.0 (−27.6)‰, LCFA: −33.5 (−32.8)‰ and Δ14C TOC: −129 (−38)‰, LCFA: −134 (−143)‰, respectively. Such estimates will aid in establishing quantitative links between production, export, and burial of OC from the terrestrial biosphere.https://doi.org/10.1029/2018GC007539Danube Riverorganic carbonbiomarkerradiocarbonADCP |
| spellingShingle | Chantal V. Freymond Maarten Lupker Francien Peterse Negar Haghipour Lukas Wacker Florin Filip Liviu Giosan Timothy I. Eglinton Constraining Instantaneous Fluxes and Integrated Compositions of Fluvially Discharged Organic Matter Geochemistry, Geophysics, Geosystems Danube River organic carbon biomarker radiocarbon ADCP |
| title | Constraining Instantaneous Fluxes and Integrated Compositions of Fluvially Discharged Organic Matter |
| title_full | Constraining Instantaneous Fluxes and Integrated Compositions of Fluvially Discharged Organic Matter |
| title_fullStr | Constraining Instantaneous Fluxes and Integrated Compositions of Fluvially Discharged Organic Matter |
| title_full_unstemmed | Constraining Instantaneous Fluxes and Integrated Compositions of Fluvially Discharged Organic Matter |
| title_short | Constraining Instantaneous Fluxes and Integrated Compositions of Fluvially Discharged Organic Matter |
| title_sort | constraining instantaneous fluxes and integrated compositions of fluvially discharged organic matter |
| topic | Danube River organic carbon biomarker radiocarbon ADCP |
| url | https://doi.org/10.1029/2018GC007539 |
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