ABSTRACT
IVAR S. A. ISAKSEN, TERJE K. BERNTSEN, STIG B. DALSØREN, KOSTAS ELEFTHERATOS, YVAN ORSOLINI, BJØRG ROGNERUD, FRODE STORDAL, OLE AMUND SØVDE, CHRISTOS ZEREFOS, and CHRIS D. HOLMES
4.1 INTRODUCTION
The chemically active climate gases ozone (O3) and methane (CH4) respond to variability in the current climate and will be affected by future climate change ([1,2]). O3 and CH4 will in addition to being influenced by atmospheric chemistry respond on changes in solar radiation, atmospheric temperature and dynamics, and are expected to play an important role for processes determining the interaction between the biosphere and the atmosphere ([2,3,4]). CH4 chemistry is also affecting climate through its impact on ozone ([5]). Emissions of air pollutants and their precursors, which determine regional air quality by perturbing ozone and methane has also the possibility to alter climate. Climate changes will affect chemical processes in the atmosphere through transport on local and large scales and through removal and formation of pollutants ([6,7]).
