Lake Kuivajärvi in Hyytiälä, Finland received the official ICOS (Integrated Carbon Observation System) label for associated ecosystem station in May 2020, measuring lake-atmosphere carbon exchange and related environmental variables in atmosphere and in water. Flux measurements at Lake Kuivajärvi have started already in 2009. You can read more about the ICOS station network in Finland from ICOS-Finland webpage.
Read more about the addition of Kuivajärvi to ICOS network (in Finnish): Suomalainen järviasema mukaan hiilenkiertoa mittaavaan verkostoon.