The opponent is Associate Professor Tobias Rütting from University of Gothenburg, Sweden, and the custos professor Jaana Bäck, Institute for Atmospheric and Earth System Research and Faculty of Agriculture and Forestry, University of Helsinki. The defence can be followed remotely using the following link: https://helsinki.zoom.us/j/65577985364?pwd=ZDJ6dkVBUktiQTN0SmdNdjU2N1paQT09 It will also be possible to attend the defence in Metsätalo, lecture hall 1 (Unioninkatu 40). NOTE: The audience is limited to 40 persons who are allowed to enter the room in the order of presence. Doors will be closed when 40 people are in.