Arctic trees and their isotopic (both radioactive and stable) ratios are sensitive to solar activity, light intensity, temperature and humidity
conditions through photosynthetic process. The project aims to study how terrestrial and extraterrestrial anomalic factors show up in
the tree-ring time series via combination of multi-proxy isotopic and wood growth and density measurements on the long Arctic treering
series of Pinus sylvestris in two latitudes in Finnish Lapland.
Scientific publications (Pekka Nöjd, Samuli Helama, Harri Mäkinen)