@article{c75c0453aae948e39f268af38324419a,
title = "The fate of fluvially-deposited organic carbon during transient floodplain storage",
abstract = "CO2 release from particulate organic carbon (POC) oxidation during fluvial transit can influence climate over a range of timescales. Identifying the mechanistic controls on such carbon fluxes requires determining where POC oxidation occurs in river systems. While field data show POC oxidation and replacement moving downstream in lowland rivers, flume studies show that oxidation during active fluvial transport is limited. This suggests that most fluvial POC oxidation occurs during transient floodplain storage, but this idea has yet to be tested. Here, we isolate the influence of floodplain storage time on POC oxidation by exploiting a chronosequence of floodplain deposits above the modern groundwater table in the Rio Bermejo, Argentina. Measurements from 15 floodplain cores with depositional ages from 1 y to 20 ky show a progressive POC concentration decrease and 13C-enrichment with increasing time spent in floodplain storage. These results from the Rio Bermejo indicate that over 80% of fluvially-deposited POC can be oxidized over millennial timescales in aerated floodplains. Furthermore, POC in the oldest floodplain cores is more 14C-enriched than expected based on the independently-dated floodplain ages, indicating that a portion of this oxidized POC is replaced by autochthonous POC produced primarily by floodplain vegetation. We suggest floodplain storage timescales control the extent of oxidation of fluvially-deposited POC, and may play a prominent role in determining if rivers are significant atmospheric CO2 sources.",
author = "Scheingross, {J. S.} and Repasch, {M. N.} and N. Hovius and D. Sachse and M. Lupker and M. Fuchs and I. Halevy and Gr{\"o}cke, {D. R.} and Golombek, {N. Y.} and N. Haghipour and Eglinton, {T. I.} and O. Orfeo and Schleicher, {A. M.}",
note = "Support for this work came from an Alexander von Humboldt Foundation Postdoctoral Fellowship to J.S.S., Helmholtz Association funding to N. Hovius, the StRATEGy international research training group funded by the German Research Foundation ( DFG ) and the State of Brandenburg to D.S. and M.R., and the Swiss National Science Foundation (SNF) Grant No. 200020_163162 (CAPS-LOCK2) to T.I.E. We thank Jordon Hemingway and two anonymous reviewers for constructive feedback and benefited from discussions with M. Dellinger, R. Hilton, and M. Torres. K. Cook, H. Hassenruck-Gudipati, R. Teodoro Casimiro, and H. Wittmann provided field assistance. Sediment grain size analyses were made in the GFZ Sed Lab, and we thank B. Plessen, S. Pinkerneil, and P. Meier for assistance with bulk carbon concentration and stable isotope measurements at GFZ. Author contributions - J.S. Scheingross: Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Writing – original draft. M.N. Repasch: Conceptualization, Formal analysis, Investigation, Methodology, Writing – review & editing. N. Hovius: Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Supervision, Writing – review & editing. D. Sachse: Conceptualization, Formal analysis, Funding acquisition, Investigation, Methodology, Writing – review & editing. M. Lupker: Methodology, Resources, Writing – review & editing. M. Fuchs: Methodology, Resources, Writing – review & editing. I. Halevy: Methodology, Writing – review & editing. D.R. Gr{\"o}cke: Methodology, Resources, Writing – review & editing. N.Y. Golombek: Investigation, Methodology, Writing – review & editing. N. Haghipour: Methodology, Resources, Writing – review & editing. T.I. Eglinton: Funding acquisition, Methodology, Resources, Writing – review & editing. O. Orfeo: Investigation, Resources, Writing – review & editing. A.M. Schleicher: Methodology, Resources, Writing – review & editing.",
year = "2021",
month = may,
day = "1",
doi = "10.1016/j.epsl.2021.116822",
language = "الإنجليزيّة",
volume = "561",
journal = "Earth and Planetary Science Letters",
issn = "0012-821X",
publisher = "Elsevier B.V.",
}