title: Large difference in carbon emission – burial balances between boreal and arctic lakes.
abstract: Lakes play an important role in the global carbon (C) cycle by burying C in sediments and emitting CO2 and CH4 to the atmosphere. The strengths and control of these fundamentally different pathways are therefore of interest when assessing the continental C balance and its response to environmental change. In this study, based on new high-resolution estimates in combination with literature data, we show that annual emission:burial ratios are generally ten times higher in boreal compared to subarctic - arctic lakes. These results suggest major differences in lake C cycling between biomes, as lakes in warmer boreal regions emit more and store relatively less C than lakes in colder arctic regions. Such effects are of major importance for understanding climatic feedbacks on the continental C sink - source function at high latitudes. If predictions of global warming and northward expansion of the boreal biome are correct, it is likely that increasing C emissions from high latitude lakes will partly counteract the presumed increasing terrestrial C sink capacity at high latitudes.
authors.affiliation: Department of Environmental Science and Analytical Chemistry (ACES), Stockholm University, SE-106 91 Stockholm, Sweden.|Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science,Umeå University, SE-981 07 Abisko, Sweden.
authors.forename: E J
authors.initials: EJ
authors.lastname: Lundin
authors.affiliation: Department of Ecology and Environmental Science, Umeå University, SE-90187 Umeå, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Klaminder
authors.affiliation: Department of Thematic Studies-Environmental Change, Linköping University, SE-58183 Linköping, Sweden.
authors.forename: D
authors.initials: D
authors.lastname: Bastviken
authors.affiliation: Department of Ecology and Environmental Science, Umeå University, SE-90187 Umeå, Sweden.
authors.forename: C
authors.initials: C
authors.lastname: Olid
authors.affiliation: Université de Toulouse; INP, UPS; EcoLab; ENSAT, Avenue de l'Agrobiopole, 31326 Castanet Tolosan, France.|CNRS; EcoLab; 31326 Castanet Tolosan, France.
authors.forename: S V
authors.initials: SV
authors.lastname: Hansson
authors.affiliation: Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science,Umeå University, SE-981 07 Abisko, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Karlsson
mesh_terms: D001110:Arctic Regions; D002244:Carbon; D057486:Carbon Cycle; D017753:Ecosystem; D060106:Lakes
chemical_list: D002244:Carbon