My research has been centered around biosphere–atmosphere
exchange in terrestrial ecosystems. The first 10 years mainly dealt
with spread and deposition of heavy metals from industrial
activities such as power plants, steel works and mining
(Greenland), including environmental assessments. The next 10 years
were centered on aspects of acid rain and atmospheric chemistry.
During this phase I started working with micro-meteorology and
implemented flux measurement methods of nitrogen oxides and ozone.
During the later years, the main emphasis has been on greenhouse
gas exchange including long-term measurements of CO2 fluxes and
effects of climate change. My main contribution to the
international research community is long-term flux measurements of
CO2 over different ecosystems. The data and results have been made
available to the international research community through the
NASA-funded organisation FLUXNET.