1. Meteotest, CH-3012 Bern, Switzerland
2. Department
of Environmental Sciences, University of Basel, CH-4056 Basel, Switzerland
3. Department
of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden
4. Unit
for field-based forest research, Swedish University of Agricultural Sciences, Svartberget Forest Research Station, SE-922 91 Vindeln, Sweden
5. Department
of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, SE-75236 Uppsala, Sweden
6. Department
of Earth Sciences, University of Uppsala, SE-75236 Uppsala, Sweden