This paper analyzes dissolved organic carbon (DOC) in several thousand lakes in Fennoscandia, and the drivers related to catchment properties. It also predict future changes in DOC also to coastal waters, and is thus relevant to the observed coastal water darkening.
The article can be read at the journal website.
Crapart, C., Finstad, A.G., Hessen, D.O., Vogt, R.D., Andersen, T., 2023. Spatial predictors and temporal forecast of total organic carbon levels in boreal lakes. Science of The Total Environment 870, 161676. https://doi.org/10.1016/j.scitotenv.2023.161676