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false4DOIDB.GFZ 10.5880/GFZ.4.6.2024.004 Dosch, Sophia Sophia Dosch 0009-0009-5506-1808 GFZ German Research Centre for Geosciences, Potsdam, Germany Universität Potsdam, Institute of Geosciences, Potsdam, Germany Hovius, Niels Niels Hovius 0000-0002-9158-9871 GFZ German Research Centre for Geosciences, Potsdam, Germany Universität Potsdam, Institute of Geosciences, Potsdam, Germany Bufe, Aaron Aaron Bufe 0000-0002-8551-7265 Ludwig-Maximilians-Universität München Repasch, Marisa Marisa Repasch 0000-0003-2636-9896 University of Milano-Bicocca, Laboratory for Provenance Studies, Italy Scheingross, Joel Joel Scheingross 0000-0002-7220-8084 University of Nevada Reno, Department of Geological Sciences and Engineering, Nevada Geosciences, Reno, USA Vieth-Hillebrand, Andrea Andrea Vieth-Hillebrand 0000-0002-3688-662X GFZ German Research Centre for Geosciences, Potsdam, Germany Sachse, Dirk Dirk Sachse 0000-0003-4207-0309 GFZ German Research Centre for Geosciences, Potsdam, Germany Humboldt Universität zu Berlin, Department of Geography, Berlin, Germany GFZ Data Services 2024 Floodplain carbon cycling Seasonal carbon cycling Morphological impact on respiration substrate use EARTH SCIENCE > ATMOSPHERE > ATMOSPHERIC CHEMISTRY > CARBON AND HYDROCARBON COMPOUNDS > CARBON DIOXIDE EARTH SCIENCE > BIOSPHERE > ECOLOGICAL DYNAMICS EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > FLUVIAL LANDFORMS > STREAM TERRACE EARTH SCIENCE > SOLID EARTH > GEOMORPHIC LANDFORMS/PROCESSES > FLUVIAL PROCESSES > DEGRADATION Dosch, Sophia GFZ German Research Centre for Geosciences, Potsdam, Germany 2024-15-07 2017 Dataset 10.1029/2024JG008517 10.1130/0091-7613(1997)025<0895:Tmfbsa>2.3.co;2 10.1029/2019jf005419 10.1029/2023AV000924 10.1038/s41561-021-00845-7 CC BY 4.0 To understand how climate change impacts the global carbon cycle, we need a mechanistic understanding of natural processes driving the capture, storage and release of CO2 within landscapes. Photosynthesis removes carbon from the atmosphere, and the organic carbon (OC) stored in vegetation, soils, and sediments can be eroded and subsequently transported by rivers to marine depocenters. During transport, OC can be stabilized and temporally stored in floodplains or oxidized and returned to the atmosphere as CO2. The balance of storage and release controls the floodplains net carbon budget. Recent research suggests that OC storage can exceed the CO2 release on aggradational floodplains of meandering rivers over millennia. However, direct measurements of the CO2 release from fluvial systems are rare and it remains unclear how geomorphic features, such as channel type and associated floodplain morphology as well as seasonality affect CO2 release.

This data set comprises measurements of CO2 fluxes, CO2 d13C values and source d13C values along morphological gradients and two seasons. We measured CO2 fluxes and corresponding d13C values on the catchment-scale in the Rio Bermejo foreland, northwestern Argentina, using a static, non-stationary accumulation chamber. We measured fluxes from the water surface, from sediment deposited on recently exposed riverbeds, on the overbanks, and in paleochannels, along braided and meandering river reaches, during a wet and a dry season. Our aim was to understand how regional-scale morphology and seasonality impact the CO2 fluxes in a foreland floodplain.
Study area at Rio Bermejo, Argentina -62.5901 -59.4371 -26.4151 -23.8292 Deutsche Forschungsgemeinschaft http://dx.doi.org/10.13039/501100001659 STR 373/34-1 International Research Training Group IGK2018 “SuRfAce processes, TEctonics and Georesources: The Andean foreland basin of Argentina” (STRATEGy)