Boreal forests cover 33% of the global forest area, and 65% of the water used by boreal forests is through trees. Knowing how trees use water under rapidly changing snow and rain in northern environments is critical in Finland, nation of a thousand lakes, where 74% of the land is covered by forests. We will renew our understanding about (1) if tree water uptake modifies water's isotope characteristics, (2) if tree water uptake significantly affects soil water in boreal forests, (3) how ongoing snow and rain changes influence tree water uptake, and (4) how forest hydrology responds to changing precipitation in boreal regions. We will achieve this by conducting innovative 4-year field measurements with up-to-date instruments and interdisciplinary methodology on three typical boreal tree species and in two boreal forests around the Arctic Circle. In a warming and ‘greening' Arctic, BFF-Water will benefit forest and water resource related stakeholders and lower climate risks for society.

2023

2027