Origins, seasonality, and fluxes of organic matter in the Congo River
The Congo River in central Africa represents a major source of organic matter (OM) to the Atlantic Ocean. This study examined elemental (%OC, %N, and C:N), stable isotopic (C-13 and N-15), and biomarker composition (lignin phenols) of particulate OM (POM) and dissolved OM (DOM) across the seasonal h...
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ftfloridasu:oai:diginole.lib.fsu.edu:fsu_405721 2024-06-09T07:48:22+00:00 Origins, seasonality, and fluxes of organic matter in the Congo River Spencer, Robert G. M. (authoraut) Hernes, Peter J. (authoraut) Dinga, Bienvenu (authoraut) Wabakanghanzi, Jose N. (authoraut) Drake, Travis W. (authoraut) Six, Johan (authoraut) 2016-07 1 online resource computer https://diginole.lib.fsu.edu/islandora/object/fsu%3A405721/datastream/TN/view/Origins,%20seasonality,%20and%20fluxes%20of%20organic%20matter%20in%20the%20Congo%20River.jpg English eng eng Global Biogeochemical Cycles--0886-6236 fsu:405721 (IID) FSU_libsubv1_wos_000382582400009 (DOI) 10.1002/2016GB005427 (URL) http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000382582400009 https://diginole.lib.fsu.edu/islandora/object/fsu%3A405721/datastream/TN/view/Origins,%20seasonality,%20and%20fluxes%20of%20organic%20matter%20in%20the%20Congo%20River.jpg Text 2016 ftfloridasu 2024-05-10T08:08:14Z The Congo River in central Africa represents a major source of organic matter (OM) to the Atlantic Ocean. This study examined elemental (%OC, %N, and C:N), stable isotopic (C-13 and N-15), and biomarker composition (lignin phenols) of particulate OM (POM) and dissolved OM (DOM) across the seasonal hydrograph. Even though the Congo exhibits an extremely stable intra-annual discharge regime, seasonal variability in OM composition was evident. DOM appears predominantly derived from vascular plant inputs with greater relative contribution during the rising limb and peak in discharge associated with the major November-December discharge maximum. Generally, POM appears to be sourced from soil-derived mineral-associated OM (low C:N, low (8), and higher (Ad:Al)(v)) but the relative proportion of fresh vascular plant material (higher C:N, higher (8), and lower (Ad:Al)(v)) increases with higher discharge. During the study period (September 2009 to November 2010) the Congo exported 29.21Tgyr(-1) of total suspended sediment (TSS), 1.96Tgyr(-1) of particulate organic carbon (POC), and 12.48Tgyr(-1) of dissolved organic carbon. The Congo exports an order of magnitude lower TSS load in comparison to other major riverine sources of TSS (e.g., Ganges and Brahmaputra), but due to its OM-rich character it actually exports a comparable amount of POC. The Congo is also 2.5 times more efficient at exporting dissolved lignin per unit volume compared to the Amazon. Including Congo dissolved lignin data in residence time calculations for lignin in the Atlantic Ocean results in an approximately 10% reduction from the existing estimate, suggesting that this material is more reactive than previously thought. Keywords: amazon-river, amino-acids, Atlantic Ocean, Carbon, central-africa, Congo River, land-ocean, lignin, north-atlantic ocean, organic carbon, organic matter, oxidation-products, plant-tissues, transport, tributaries Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1002/2016GB005427 Text North Atlantic Florida State University: DigiNole Commons |
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Open Polar |
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Florida State University: DigiNole Commons |
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ftfloridasu |
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English |
description |
The Congo River in central Africa represents a major source of organic matter (OM) to the Atlantic Ocean. This study examined elemental (%OC, %N, and C:N), stable isotopic (C-13 and N-15), and biomarker composition (lignin phenols) of particulate OM (POM) and dissolved OM (DOM) across the seasonal hydrograph. Even though the Congo exhibits an extremely stable intra-annual discharge regime, seasonal variability in OM composition was evident. DOM appears predominantly derived from vascular plant inputs with greater relative contribution during the rising limb and peak in discharge associated with the major November-December discharge maximum. Generally, POM appears to be sourced from soil-derived mineral-associated OM (low C:N, low (8), and higher (Ad:Al)(v)) but the relative proportion of fresh vascular plant material (higher C:N, higher (8), and lower (Ad:Al)(v)) increases with higher discharge. During the study period (September 2009 to November 2010) the Congo exported 29.21Tgyr(-1) of total suspended sediment (TSS), 1.96Tgyr(-1) of particulate organic carbon (POC), and 12.48Tgyr(-1) of dissolved organic carbon. The Congo exports an order of magnitude lower TSS load in comparison to other major riverine sources of TSS (e.g., Ganges and Brahmaputra), but due to its OM-rich character it actually exports a comparable amount of POC. The Congo is also 2.5 times more efficient at exporting dissolved lignin per unit volume compared to the Amazon. Including Congo dissolved lignin data in residence time calculations for lignin in the Atlantic Ocean results in an approximately 10% reduction from the existing estimate, suggesting that this material is more reactive than previously thought. Keywords: amazon-river, amino-acids, Atlantic Ocean, Carbon, central-africa, Congo River, land-ocean, lignin, north-atlantic ocean, organic carbon, organic matter, oxidation-products, plant-tissues, transport, tributaries Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1002/2016GB005427 |
author2 |
Spencer, Robert G. M. (authoraut) Hernes, Peter J. (authoraut) Dinga, Bienvenu (authoraut) Wabakanghanzi, Jose N. (authoraut) Drake, Travis W. (authoraut) Six, Johan (authoraut) |
format |
Text |
title |
Origins, seasonality, and fluxes of organic matter in the Congo River |
spellingShingle |
Origins, seasonality, and fluxes of organic matter in the Congo River |
title_short |
Origins, seasonality, and fluxes of organic matter in the Congo River |
title_full |
Origins, seasonality, and fluxes of organic matter in the Congo River |
title_fullStr |
Origins, seasonality, and fluxes of organic matter in the Congo River |
title_full_unstemmed |
Origins, seasonality, and fluxes of organic matter in the Congo River |
title_sort |
origins, seasonality, and fluxes of organic matter in the congo river |
publishDate |
2016 |
url |
https://diginole.lib.fsu.edu/islandora/object/fsu%3A405721/datastream/TN/view/Origins,%20seasonality,%20and%20fluxes%20of%20organic%20matter%20in%20the%20Congo%20River.jpg |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
Global Biogeochemical Cycles--0886-6236 fsu:405721 (IID) FSU_libsubv1_wos_000382582400009 (DOI) 10.1002/2016GB005427 (URL) http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000382582400009 https://diginole.lib.fsu.edu/islandora/object/fsu%3A405721/datastream/TN/view/Origins,%20seasonality,%20and%20fluxes%20of%20organic%20matter%20in%20the%20Congo%20River.jpg |
_version_ |
1801380062264557568 |