Large Lakes Dominate CO2 Evasion From Lakes in an Arctic Catchment

Research output: Contribution to journalArticle

Abstract

CO2 evasion from freshwater lakes is an important component of the carbon cycle. However, the relative contribution from different lake sizes may vary, since several parameters underlying CO2 flux are size dependent. Here we estimated the annual lake CO2 evasion from a catchment in northern Sweden encompassing about 30,000 differently sized lakes. We show that areal CO2 fluxes decreased rapidly with lake size, but this was counteracted by the greater overall coverage of larger lakes. As a result, total efflux increased with lake size and the single largest lake in the catchment dominated the CO2 evasion (53% of all CO2 evaded). By contrast, the contribution from the smallest ponds (about 27,000) was minor (<6%). Our results emphasize the importance of accounting for both CO2 flux rates and areal contribution of various sized lakes in assessments of CO2 evasion at the landscape scale.

Details

Authors
  • Gerard Rocher-Ros
  • Reiner Giesler
  • Erik Lundin
  • Shokoufeh Salimi
  • Anders Jonsson
  • Jan Karlsson
Organisations
External organisations
  • Umeå University
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Climate Research
  • Geophysics

Keywords

  • Lake CO evasion, Lake size distribution, Upscaling C cycle
Original languageEnglish
Pages (from-to)12,254–12,261
JournalGeophysical Research Letters
Volume44
Issue number24
Publication statusPublished - 2017 Dec 28
Publication categoryResearch
Peer-reviewedYes