Applicability and consequences of the integration of alternative models for CO2 transfer velocity into a process-based lake model
Kiuru, P., Ojala, A., Mammarella, I., Heiskanen, J., Erkkilä, K.-M., Miettinen, H., Vesala, T., & Huttula, T. (2019). Applicability and consequences of the integration of alternative models for CO2 transfer velocity into a process-based lake model. Biogeosciences, 16(17), 3297-3317. https://doi.org/10.5194/bg-16-3297-2019
© The Authors, 2019
Freshwater lakes are important in carbon cycling, especially in the boreal zone where many lakes are supersaturated with the greenhouse gas carbon dioxide (CO2) and emit it to the atmosphere, thus ventilating carbon originally fixed by the terrestrial system. The exchange of CO2 between water and the atmosphere is commonly estimated using simple wind-based parameterizations or models of gas transfer velocity (k). More complex surface renewal models, however, have been shown to yield more correct estimates of k in comparison with direct CO2 flux measurements. We incorporated four gas exchange models with different complexity into a vertical process-based physico-biochemical lake model, MyLake C, and assessed the performance and applicability of the alternative lake model versions to simulate air–water CO2 fluxes over a small boreal lake. None of the incorporated gas exchange models significantly outperformed the other models in the simulations in comparison to the measured near-surface CO2 concentrations or respective air–water CO2 fluxes calculated directly with the gas exchange models using measurement data as input. The use of more complex gas exchange models in the simulation, on the contrary, led to difficulties in obtaining a sufficient gain of CO2 in the water column and thus resulted in lower CO2 fluxes and water column CO2 concentrations compared to the respective measurement-based values. The inclusion of sophisticated and more correct models for air–water CO2 exchange in process-based lake models is crucial in efforts to properly assess lacustrine carbon budgets through model simulations in both single lakes and on a larger scale. However, finding higher estimates for both the internal and external sources of inorganic carbon in boreal lakes is important if improved knowledge of the magnitude of CO2 evasion from lakes is included in future studies on lake carbon budgets. ...
Publication in research information system
MetadataShow full item record
Additional information about fundingThis research has been supported by the Academy of Finland (grant nos. 272041, 118780, 1284701, 1282842, and 281255), the European Commission (Horizon 2020 (grant no. 730944)), the Koneen Säätiö, and the Maa- ja vesitekniikan tuki ry.
Showing items with similar title or keywords.
Vesterinen, Jussi (University of Jyväskylä, 2017)Littoral zones in lakes are among the most productive habitats in the world, but have been seriously understudied, as most limnological studies have concerned only pelagic habitats. The likely importance of littoral ...
Epiphytic bacteria make an important contribution to heterotrophic bacterial production in a humic boreal lake Vesterinen, Jussi; Devlin, Shawn; Syväranta, Jari; Jones, Roger (Inter-Research, 2017)Bacterial production (BP) in lakes has generally only been measured in the pelagic zone without accounting for littoral BP, and studies of BP at the whole-lake scale are very scarce. In the dystrophic humic lakes, which ...
The influence of lipid content and taxonomic affiliation on methane and carbon dioxide production from phytoplankton biomass in lake sediment Hiltunen, Minna; Nykänen, Hannu; Syväranta, Jari (John Wiley & Sons, 2021)The greenhouse gases methane (CH4) and carbon dioxide (CO2) are end products of microbial anaerobic degradation of organic matter (OM) in lake sediments. Although previous research has shown that phytoplankton lipid content ...
Coupling of iron and dissolved organic matter in lakes–selective retention of different size fractions Riise, Gunnhild; Haaland, Ståle Leif; Xiao, Yihua (Springer, 2023)Increasing concentration of iron (Fe) is observed in many boreal lakes, such as for the present study in Oslo Østmark, SE-Norway (1983–2018). As Fe-regulating processes are complex and dynamic, the link between mobilizing ...
Biogenic Fenton process : A possible mechanism for the mineralization of organic carbon in fresh waters Vähätalo, Anssi V.; Xiao, Yihua; Salonen, Kalevi (Elsevier, 2021)To explore the mechanisms that mineralize poorly bioavailable natural organic carbon (OC), we measured the mineralization of OC in two lake waters over long-term experiments (up to 623 days) at different pH and iron (Fe) ...