cc-by-4.0Väliranta, Minna2025-04-292022-02-282022-02-28https://datakatalogi.helsinki.fi/handle/123456789/5658Peat core data from three Finnish peatlands used to reconstruct site-scale carbon exchange between the peatlands and the atmosphere. Basal peat radiocarbon ages; reconstructed peat area over time based on these basal ages; carbon accumulation data along multiple peat cores; additionally reconstructed peat type and methane emission rates.peatland carbon accumulationpeatland expansionmethane emissiondataset