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Conclusions

  • The two boreonemoral freshwater systems; Lake Erssjön and Lake Följesjön, were net sources of CO2 during the study, due to the strong regulation by respiration.
     
  • The study demonstrates that measurements with high temporal and spatial resolution, where CO2 is followed over longer time periods, is needed in order to properly estimate CO2 in lakes.
     
  • Lake Erssjön showed strong seasonal variation in pCOand CO2 flux, where markedly higher values were found in late summer to early autumn. An explaination for this was the mixing of water layers when the stratification started to release.
     
  • Primary production affected the diel patterns of pCOin Lake Erssjön, which decreased during light hours and increased during dark hours. An increased respiration during the night resulted in a peak in pCO2 which generally ocurred in the mornings.
     
  • Photosynthesis consums CO2 and produces O2 and is stimulated by warmer waters, which explaines why the pCO2  and the flux in Lake Erssjön were negatively correlated to Oand water temperature.
     
  • A tendency for higher pCO2 leves in connection to the two inlets in Lake Erssjön, infers that the inlets functioned as an inflow of terrestrially derived carbon.


Responsible for this page: Agneta Johansson
Last updated: 05/22/15