( a ) Participation in the activities of external organizations , particularly the Global Terrestrial Observing System ( GTOS ) and the International Long-Term Ecological Research Network ( ILTER ) ; ( b ) Participation in projects with a global perspective , i.e . Carbon and nitrogen interactions in forest ecosystems ( CNTER ) and Climate-induced variation of dissolved organic carbon in Nordic surface waters ( NMDTOC ) ; ( c ) Continuing contacts with the Biosphere Reserve Integrated Monitoring ( BRIM ) and Scandinavian/North European Network of Terrestrial Field bases ( SCANNET ) .