Tracking vegetation phenology of pristine northern boreal peatlands by combining digital photography with CO2 flux and remote sensing data - Linkosalmi, M.; Tuovinen, J.-P.; Nevalainen, O.; Peltoniemi, M.; Taniş, C. M.; Arslan, A. N.; Rainne, J.; Lohila, A.; Laurila, T.; Aurela, M. (Biogeosciences Discuss., 2022)