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  Fate of the Amazon River dissolved organic matter in the tropical Atlantic Ocean

Medeiros, P. M., Seidel, M., Ward, N. D., Carpenter, E. J., Gomes, H. R., Niggemann, J., et al. (2015). Fate of the Amazon River dissolved organic matter in the tropical Atlantic Ocean. Global Biogeochemical Cycles, 29(5): 1, pp. 677-690.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0001-C439-2 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0001-C43A-1
Genre: Zeitschriftenartikel

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Medeiros, Patricia M., Autor
Seidel, Michael1, Autor           
Ward, Nicholas D., Autor
Carpenter, Edward J., Autor
Gomes, Helga R., Autor
Niggemann, Jutta1, Autor           
Krusche, Alex V., Autor
Richey, Jeffrey E., Autor
Yager, Patricia L., Autor
Dittmar, Thorsten2, Autor           
Affiliations:
1Department of Biogeochemistry, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481693              
2Marine Geochemistry Group, Max Planck Institute for Marine Microbiology, Max Planck Society, ou_2481705              

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 Zusammenfassung: Constraining the fate of dissolved organic matter (DOM) delivered by rivers is a key to understand the global carbon cycle, since DOM mineralization directly influences air-sea CO2 exchange and multiple biogeochemical processes. The Amazon River exports large amounts of DOM, and yet the fate of this material in the ocean remains unclear. Here we investigate the molecular composition and transformations of DOM in the Amazon River-ocean continuum using ultrahigh resolution mass spectrometry and geochemical and biological tracers. We show that there is a strong gradient in source and composition of DOM along the continuum, and that dilution of riverine DOM in the ocean is the dominant pattern of variability in the system. Alterations in DOM composition are observed in the plume associated with the addition of new organic compounds by phytoplankton and with bacterial and photochemical transformations. The relative importance of each of these drivers varies spatially and is modulated by seasonal variations in river discharge and ocean circulation. We further show that a large fraction (50–76%) of the Amazon River DOM is surprisingly stable in the coastal ocean. This results in a globally significant river plume with a strong terrigenous signature and in substantial export of terrestrially derived organic carbon from the continental margin, where it can be entrained in the large-scale circulation and potentially contribute to the long-term storage of terrigenous production and to the recalcitrant carbon pool found in the deep ocean.

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Sprache(n): eng - English
 Datum: 2015-05-25
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Interne Begutachtung
 Identifikatoren: eDoc: 712855
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Titel: Global Biogeochemical Cycles
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 29 (5) Artikelnummer: 1 Start- / Endseite: 677 - 690 Identifikator: -