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Conclusion

The results of this study clearly indicated a large spatial and temporal variability in CH4 fluxes within and between lakes. The inlets in Lake Erssjön were hotspots for CH4 emissions and the CH4 emissions decreased after the fall overturn. Measurements with a high resolution both in time and space are needed not to miss important short term variations. The ebullition was lower with increasing depth and higher water temperature. Diffusion, however, was dependent on water temperature but did not change with depth. Therefore, a small shallow lake may release more CH4 than a large lake. The open water part of Lake Följesjön released more CH4 and it is shallower than Lake Erssjön. The significant differences in CH4 emissions between the two lakes could mainly be explained by two measured complementary variables depth and P. The P concentrations reflects the productivity in the lake, connected to the productivity of the lake is the surroundings. The local condition have large effect on the CH4 emissions, but the CH4 emissions from lakes can also be effected on global changes. The CH4 emissions will increase the global warming will increased water temperature will which will increase the CH4 emission. 


Responsible for this page: Agneta Johansson
Last updated: 10/20/15