Articles | Volume 6, issue 11
Biogeosciences, 6, 2475–2493, 2009
https://doi.org/10.5194/bg-6-2475-2009
Biogeosciences, 6, 2475–2493, 2009
https://doi.org/10.5194/bg-6-2475-2009

  05 Nov 2009

05 Nov 2009

Distribution, origin and cycling of carbon in the Tana River (Kenya): a dry season basin-scale survey from headwaters to the delta

S. Bouillon1,2,3, G. Abril4, A. V. Borges5, F. Dehairs2, G. Govers1, H. J. Hughes6, R. Merckx1, F. J. R. Meysman2,3, J. Nyunja7, C. Osburn8, and J. J. Middelburg3,9 S. Bouillon et al.
  • 1Katholieke Universiteit Leuven, Dept. of Earth & Environmental Sciences, Kasteelpark Arenberg 20, 3001 Leuven, Belgium
  • 2Dept. of Analytical and Environmental Chemistry, Vrije Universiteit Brussel, Belgium
  • 3Netherlands Institute of Ecology, Centre for Estuarine and Marine Ecology, Yerseke, The Netherlands
  • 4Environnements et Paléoenvironnements Océaniques, Université Bordeaux 1, France
  • 5Unité d'Océanographie Chimique, Université de Liège, Belgium
  • 6Royal Museum for Central Africa, Dept. of Geology, Tervuren, Belgium
  • 7Kenya Wildlife Service, P.O. Box 40241-00100, Nairobi, Kenya
  • 8Department of Marine, Earth & Atmospheric Sciences, NC State University, Raleigh, USA
  • 9Faculty of Geosciences, Utrecht University, PO Box 80021, 3508 TA Utrecht, The Netherlands

Abstract. The Tana River basin (TRB) is the largest in Kenya (~120 000 km2). We conducted a survey during the dry season throughout the TRB, analyzing a broad suite of biogeochemical parameters. Biogeochemical signatures in headwater streams were highly variable. Along the middle and lower river course, total suspended matter (TSM) concentrations increased more than 30-fold despite the absence of tributary inputs, indicating important resuspension events of internally stored sediment. These resuspended sediment inputs were characterized by a lower and 14C-depleted OC content, suggesting selective degradation of more recent material during sediment retention. Masinga Dam (a large reservoir on the upper river) induced a strong nutrient retention (~50% for inorganic N, ~72% for inorganic phosphate, and ~40% for dissolved silicate). Moreover, while DOC pools and δ13C signatures were similar above, in and below the reservoir, the POC pool in Masinga surface waters was dominated by 13C-depleted phytoplankton, which contributed to the riverine POC pool immediately below the dam, but rapidly disappeared further downstream, suggesting rapid remineralization of this labile C pool in the river system. Despite the generally high turbidity, the combination of relatively high oxygen saturation levels, low δ18O signatures of dissolved O2 (all <+24.2‰), and the relatively low pCO2 values suggest that in-stream primary production was significant, even though pigment data suggest that phytoplankton makes only a minor contribution to the total POC pool in the Tana River.

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