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Lake Kivu pp 47-66 | Cite as

Variability of Carbon Dioxide and Methane in the Epilimnion of Lake Kivu

Chapter
Part of the Aquatic Ecology Series book series (AQEC, volume 5)

Abstract

We report a dataset of the partial pressure of CO2 (pCO2) and methane concentrations (CH4) in the surface waters of Lake Kivu obtained during four cruises covering the two main seasons (rainy and dry). Spatial gradients of surface pCO2 and CH4 concentrations were modest in the main basin. In Kabuno Bay, pCO2 and CH4 concentrations in surface waters were higher, owing to the stronger influence of subaquatic springs from depth. Seasonal variations of pCO2 and CH4 in the main basin of Lake Kivu were strongly driven by deepening of the epilimnion and the resulting entrainment of water characterized by higher pCO2 and CH4 concentrations. Physical and chemical vertical patterns in Kabuno Bay were seasonally stable, owing to a stronger stratification and smaller surface area inducing fetch limitation of wind driven turbulence. A global and regional cross-system comparison of pCO2 and CH4 concentrations in surface waters of lakes highlights the peculiarity of Kabuno Bay in terms of pCO2 values in surface waters. In terms of surface CH4 concentrations, both Kabuno Bay and the main basin of Lake Kivu are at the lower end of values in lakes globally, despite the huge amounts of CH4 and CO2 in the deeper layers of the lake.

Keywords

Total Organic Carbon Dissolve Inorganic Carbon Particulate Organic Carbon Total Alkalinity East African Rift 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We are grateful to Boniface Kaningini and Pascal Isumbisho Mwapu (Institut Supérieur Pédagogique, Bukavu, Democratic Republic of the Congo) and Laetitia Nyina-wamwiza (National University of Rwanda, Butare, Rwanda) and their respective teams for logistic support during the cruises, to Sebastian Sobek for sharing his pCO2 database and reviewing the previous versions of the manuscript. This work was funded by the Fonds National de la Recherche Scientifique (FNRS) under the CAKI (Cycle du carbone et des nutriments au Lac Kivu) project (contract n° 2.4.598.07), and contributes to the European Research Council starting grant project AFRIVAL (African river basins: catchment-scale carbon fluxes and transformations, 240002) and to the Belgian Federal Science Policy Office EAGLES (East African Great Lake Ecosystem Sensitivity to changes, SD/AR/02A) project. AVB, BD and GL are research associates at the FNRS. FD was a postdoctoral researcher at the FNRS.

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Copyright information

© Springer Science+Business Media B.V. 2012

Authors and Affiliations

  1. 1.Chemical Oceanography UnitUniversity of LiègeLiègeBelgium
  2. 2.Departement Aard- en OmgevingswetenschappenKatholieke Universiteit LeuvenLeuvenBelgium
  3. 3.Laboratoire Environnements et Paléoenvironnements OcéaniquesUniversité de Bordeaux 1BordeauxFrance
  4. 4.Institut de Recherche pour le Développement, Laboratorio de Potamologia AmazônicaUniversidad Federal do AmazonasManausBrazil
  5. 5.Laboratoire d’OcéanologieUniversité de LiègeLiègeBelgium
  6. 6.Ecologie des Systèmes AquatiquesUniversité Libre de BruxellesBrusselsBelgium
  7. 7.Research Unit in Environmental and Evolutionary BiologyUniversity of NamurNamurBelgium

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