Carbon dioxide sinks or sources? That’s what Anna Virkkala is working on in these photos. Virkkala is involved in a project that seeks to determine if northern tundra and boreal regions work as annual sources or sinks of CO2. A recent study synthesizes data from 148 northern sites to find out. The results indicate that Fennoscandia, European Russia, southern Canada, and southern Siberia are annual carbon dioxide sinks. Northern and central Siberia, northern and central Alaska, and northern Canada were all found to be annual sources. “The plant carbon uptake in the tundra is barely keeping up with the carbon dioxide emissions associated with, for example, permafrost thaw, and we need to keep monitoring how these carbon budgets change over the next several decades”, says Virkkala, who is the lead author of the study. Would you like to know more? Take a look: https://www.helsinki.fi/en/news/carbon-sequestration/scientists-use-novel-methods-examine-movement-carbon-northern-terrestrial-ecosystems?utm_source=facebook&utm_medium=social_owned Photos by Markus Jylhä.