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

Golombek, Nina Y.; Scheingross, Joel S.; Repasch, Marisa N.; Hovius, Niels; Menges, Johanna; Sachse, Dirk; Lupker, Maarten; Eglinton, Timothy I.; Haghipour, Negar; Poulson, Simon R.; Gröcke, Darren R.; Latosinski, Francisco G.; Szupiany, Ricardo N.

doi:10.1029/2021gl093416

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

Golombek, Nina Y.; Scheingross, Joel S.; Repasch, Marisa N.; Hovius, Niels; Menges, Johanna; Sachse, Dirk; Lupker, Maarten; Eglinton, Timothy I.; Haghipour, Negar; Poulson, Simon R.; Gröcke, Darren R.; Latosinski, Francisco G.; Szupiany, Ricardo N.

Authors

Nina Y. Golombek

Joel S. Scheingross

Marisa N. Repasch

Niels Hovius

Johanna Menges

Dirk Sachse

Maarten Lupker

Timothy I. Eglinton

Negar Haghipour

Simon R. Poulson

Professor Darren Grocke d.r.grocke@durham.ac.uk
Professor

Francisco G. Latosinski

Ricardo N. Szupiany

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 ∼1,270 km without tributaries. Weekly POC concentration and isotopic composition from 2016 to 2018 show that during the wet season, increased lateral channel migration generates an influx of 13C-enriched and 14C-enriched floodplain-sourced material, overprinting the 13C-depleted 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.

Citation

Golombek, N. Y., Scheingross, J. S., Repasch, M. N., 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), Article e2021GL093416. https://doi.org/10.1029/2021gl093416

Journal Article Type	Article
Acceptance Date	Oct 29, 2021
Online Publication Date	Dec 6, 2021
Publication Date	Dec 28, 2021
Deposit Date	Dec 17, 2021
Publicly Available Date	Aug 8, 2023
Journal	Geophysical Research Letters
Print ISSN	0094-8276
Electronic ISSN	1944-8007
Publisher	Wiley
Peer Reviewed	Peer Reviewed
Volume	48
Issue	24
Article Number	e2021GL093416
DOI	https://doi.org/10.1029/2021gl093416
Public URL	https://durham-repository.worktribe.com/output/1220132

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© 2021. The Authors.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.