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

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

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008896 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5008896_2
Genre: Journal Article

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 Creators:
Golombek, Nina1, Author              
Scheingross, Joel1, Author              
Repasch, M.1, Author              
Hovius, Niels1, Author              
Menges, Johanna1, Author              
Sachse, D.1, Author              
Lupker, Maarten2, Author
Eglinton, Timothy I.2, Author
Haghipour, Negar2, Author
Poulson, Simon R.2, Author
Gröcke, Darren R.2, Author
Latosinski, Francisco G.2, Author
Szupiany, Ricardo N.2, Author
Affiliations:
14.6 Geomorphology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146045              
2External Organizations, ou_persistent22              

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 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.

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 Dates: 2021-12-062021
 Publication Status: Finally published
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 Identifiers: DOI: 10.1029/2021GL093416
GFZPOF: p4 T5 Future Landscapes
OATYPE: Hybrid - DEAL Wiley
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Title: Geophysical Research Letters
Source Genre: Journal, SCI, Scopus, ab 2023 oa
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Pages: - Volume / Issue: 48 (24) Sequence Number: e2021GL093416 Start / End Page: - Identifier: ISSN: 1944-8007
ISSN: 0094-8276
CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals182
Publisher: American Geophysical Union (AGU)