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Journal Article

Fluvial organic carbon composition regulated by seasonal variability in lowland river migration and water discharge

Authors
/persons/resource/golombek

Golombek,  Nina
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/jschein

Scheingross,  Joel
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/mrepasch

Repasch,  M.
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/hovius

Hovius,  Niels
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/menges

Menges,  Johanna
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/dsachse

Sachse,  D.
4.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Lupker,  Maarten
External Organizations;

Eglinton,  Timothy I.
External Organizations;

Haghipour,  Negar
External Organizations;

Poulson,  Simon R.
External Organizations;

Gröcke,  Darren R.
External Organizations;

Latosinski,  Francisco G.
External Organizations;

Szupiany,  Ricardo N.
External Organizations;

External Ressource
No external resources are shared
Fulltext (public)

5008896.pdf
(Publisher version), 2MB

Supplementary Material (public)
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Citation

Golombek, N., Scheingross, J., Repasch, M., Hovius, N., Menges, J., Sachse, D., Lupker, M., Eglinton, T. I., Haghipour, N., Poulson, S. R., Gröcke, D. R., Latosinski, F. G., Szupiany, R. N. (2021): Fluvial organic carbon composition regulated by seasonal variability in lowland river migration and water discharge. - Geophysical Research Letters, 48, 24, e2021GL093416.
https://doi.org/10.1029/2021GL093416


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008896
Abstract
Identifying drivers of seasonal variations in fluvial particulate organic carbon (POC) composition can aid sediment provenance and biogeochemical cycling studies. We evaluate seasonal changes in POC composition in the Río Bermejo, Argentina, a lowland river running ∼1270 km without tributaries. Weekly POC concentration and isotopic composition from 2016-2018 show that during the wet season, increased lateral channel migration generates an influx of 13C- and 14C-enriched floodplain-sourced material, overprinting the 13C- and 14C-depleted headwater-signature that is observed during the dry season. These findings demonstrate how channel morphodynamics can drive variability of POC composition in lowland rivers, and may modulate the composition of POC preserved in sedimentary archives.