Article (Scientific journals)
Shifts in the carbon dynamics in a tropical lowland river system (Tana River, Kenya) during flooded and non-flooded conditions
Geeraert, N.; Omengo, F. O.; Borges, Alberto et al.
2017In Biogeochemistry, 132 (1-2), p. 141-163
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Keywords :
Carbon dynamics; Flooded conditions; Stable carbon isotopes; Tropical rivers; Kenya; Tana River [(RVR) Kenya]
Abstract :
[en] Rivers transport sediment and carbon (C) from the continents to the ocean, whereby the magnitude and timing of these fluxes depend on the hydrological regime. We studied the sediment and carbon dynamics of a tropical river system at two sites along the lower Tana River (Kenya), separated by a 385 km stretch characterized by extensive floodplains, to understand how the river regime affects within-river C processing as well as the C exchange between floodplain and river. Sampling took place during three different wet seasons (2012–2014), with extensive flooding during one of the campaigns. We measured the suspended sediment concentration, the concentration and stable isotope signature of three different carbon species (particulate and dissolved organic carbon, POC and DOC, and dissolved inorganic carbon, DIC) and other auxiliary parameters. During non-flooded conditions, the total C flux was dominated by POC (57–72%) and there was a downstream decrease of the total C flux. DIC was dominating during the flooded season (56–67%) and the flux of DIC and DOC coming from the inundated floodplains resulted in a downstream increase of the total carbon flux. Our data allowed us to construct a conceptual framework for the C dynamics in river systems, whereby nine major fluxes were identified. The application of this framework highlighted the dominance of POC during non-flooded conditions and the significant CO2 emissions during the flooded season. Furthermore, it identified the exchange of POC with the floodplain as an important factor to close the C budget of the river. © 2017, Springer International Publishing Switzerland.
Research center :
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Geeraert, N.;  Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, Louvain, Belgium
Omengo, F. O.;  Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, Louvain, Belgium, Kenya Wildlife Service, P.O. Box 40241-00100, Nairobi, Kenya
Borges, Alberto  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Chemical Oceanography Unit (AGO)
Govers, G.;  Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, Louvain, Belgium
Bouillon, S.;  Department of Earth and Environmental Sciences, KU Leuven, Celestijnenlaan 200E, Louvain, Belgium
Language :
English
Title :
Shifts in the carbon dynamics in a tropical lowland river system (Tana River, Kenya) during flooded and non-flooded conditions
Publication date :
2017
Journal title :
Biogeochemistry
ISSN :
0168-2563
eISSN :
1573-515X
Publisher :
Springer International Publishing
Volume :
132
Issue :
1-2
Pages :
141-163
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 240002 - AFRIVAL - African river basins: catchment-scale carbon fluxes and transformations.
Name of the research project :
AFRIVAL
Funders :
KU Leuven - Katholieke Universiteit Leuven [BE]
FWO - Fonds Wetenschappelijk Onderzoek Vlaanderen [BE]
CER - Conseil Européen de la Recherche [BE]
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
CE - Commission Européenne [BE]
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