Diverse drivers of long-term <i>p</i>CO<sub>2</sub> increases across thirteen boreal lakes and streams
Anna Nydahl, Marcus B. Wallin, Gesa A. Weyhenmeyer
Abstract
Understanding the mechanisms driving carbon dioxide (CO2) concentrations in inland waters is important to foresee CO2 responses to environmental change, yet knowledge gaps persist regarding which processes are the key drivers. Here we investigated possible drivers across 13 Swedish lakes and streams where the partial pressure of CO2 (pCO2) has increased over a 21-year period. Overall, we could not identify a single dominating mechanism responsible for the observed pCO2 increase. In the 8 lakes, we found that pCO2 increased, driven either by a possible dissolved organic carbon (DOC) stimulation of microbial mineralization or by water color primary production suppression. In streams, the dominating mechanism for a pCO2 increase was either a change in the carbonate system distribution or a possible nutrient-driven decrease in primary production. This is the first study to demonstrate and explain consistent positive pCO2 temporal trends in freshwater ecosystems, and our results should be taken into account when predicting future emission of CO2 from inland waters.