Martin Forsius,^* Maximilian Posch,^** Julian Aherne,^*** Gert Jan Reinds,^**** Jesper Christensen,^***** Lars Hole<sup>******


*</sup>Martin Forsius () is leading the Ecosystem Change Unit at the Finnish Environment Institute (SYKE). His research concentrates on the impacts of air pollution and climate change on ecosystem biogeochemistry. Address: Finnish Environment Institute (SYKE), P.O. Box 140, 00251 Helsinki, Finland. e-mail: martin.forsius@ymparisto.fi
^**Maximilian Posch is a senior policy researcher at the LRTAP Convention's Coordination Centre for Effects (CCE) based at the Netherlands Environmental Assessment Agency (PBL). His research concentrates on modeling the effects of air pollution on terrestrial and aquatic ecosystems and the transfer of that knowledge to policy making. Address: Coordination Centre for Effects (CCE), PBL, P.O. Box 303, 3720 AH Bilthoven, The Netherlands. e-mail: max.posch@pbl.nl
^***Julian Aherne holds a Canada Research Chair in Environmental Modeling at Trent University, Canada. His research concentrates on the impacts of anthropogenic disturbance (air pollution, land use management, and climate change) on terrestrial and aquatic ecosystems. Address: Environmental and Resource Studies, Trent University, Peterborough, ON K9J 7B8, Canada. e-mail: julian.aherne@ucd.ie
^****Gert Jan Reinds is a senior researcher at Alterra, Wageningen University and Research Centre, in the Netherlands. He is specialized in the development and application of regional models for acidification and eutrophication for terrestrial ecosystems. He has a background in soil science. Address: Alterra, Wageningen University and Research Centre (WUR), P.O. Box 47, 6700 AA Wageningen, The Netherlands. e-mail: gertjan.reinds@wur.nl
^*****Jesper Christensen is an atmospheric modeler at the National Environmental Research Institute (NERI), Denmark. His research areas include weather forecast modeling and long range transport modeling of air pollution especially for the Arctic areas; he developed the air pollution model system, Danish Eulerian Hemispheric Model (DEHM), which is central in the AMAP program and in many of the atmospheric model activities at NERI. Address: Department of Atmospheric Environment, National Environmental Research Institute, University of Aarhus, P.O. Box 358, 4000 Roskilde, Denmark. e-mail: jc@dmu.dk
^******Lars Hole is a senior research scientist at the Norwegian Institute for Air Research. He holds a PhD in meteorology from the University Center on Svalbard and the University in Bergen. His professional interest is atmospheric transport and deposition of inorganic pollutants, in particular sulfur, nitrogen, and ozone, with emphasis on field experiments and micrometeorology. Address: Norwegian Institute for Air Research, Tromsø office, Polar Environment Center, 9296 Tromsø, Norway. e-mail: lrh@nilu.no