Abstract. This study explores the variability in concen-trations of dissolved CH4 and annual flux estimates in the pelagic zone in a statistically defined sample of 207 lakes in Finland. The lakes were situated in the boreal zone, in an area where the mean annual air temperature ranges from −2.8 to 5.9◦C. We examined how lake CH4 dynamics re-lated to regional lake types assessed according to the EU wa-ter framework directive. Ten lake types were defined on the basis of water chemistry, color, and size. Lakes were sam-pled for dissolved CH4 concentrations four times per year, at four different depths at the deepest point of each lake. We found that CH4 concentrations and fluxes to the atmo-sphere tended to be high in nutrient rich calcareous lakes, and that the shallow lakes had the greatest surface water con-centrations. Methane concentration in the hypolimnion was

www.earth-surf-dynam.net/1/45/2013/

Abstract not found

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www.biogeosciences.net/11/6265/2014/ doi:10.5194/bg-11-6265-2014 © Author(s) 2014. CC Attribution 3.0 License. Stable carbon isotope biogeochemistry of lakes along a trophic gradient

www.biogeosciences.net/11/5969/2014/ doi:10.5194/bg-11-5969-2014 © Author(s) 2014. CC Attribution 3.0 License. Partial coupling and differential regulation of biologically and photochemically labile dissolved organic carbon across boreal aquatic networks

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www.biogeosciences.net/12/2431/2015/ doi:10.5194/bg-12-2431-2015 © Author(s) 2015. CC Attribution 3.0 License. Dynamics of greenhouse gases (CO2, CH4, N2O) along the Zambezi River and major tributaries, and their importance in the riverine carbon budget

La diffusion de ce mémoire se fait dans le respect des droits de son auteur, qui a signé le formulaire Autorisation de reproduire et de diffuser un travail de recherche de cycles supérieurs (SDU-522- Rév.01-2006). Cette autorisation stipule que «conformément à l'article 11 du Règlement no 8 des études de cycles supérieurs, [l'auteur] concède à l'Université du Québec à Montréal une licence non exclusive d'utilisation et de publication,de la totalité ou d'une partie importante de [son] travail de recherche pour des fins pédagogiques et non commerciales. Plus précisément, [l'auteur] autorise l'Université du Québec à Montréal à reproduire, diffuser, prêter, distribuer ou vendre des copies de [son] travail de recherche à des fins non commerciales sur quelque support que ce soit, y compris l'Internet. Cette licence et cette autorisation n'entraînent pas une renonciation de [la] part [de l'auteur] à [ses] droits moraux ni à [ses] droits de propriété intellectuelle. Sauf entente contraire, [l'auteur] conserve la liberté de diffuser et de commercialiser ou non ce travail dont [il] possède un exemplaire. » Remerciements r would like ta thank Annick St. Pierre, Darryl Gilpin, Simon Barette, Delphine Marchand, Alice Parkes, Marilou Goyer for their excellent and invaluable