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Workshop “Atmospheric monitoring and inverse modelling for verification of national and EU bottom-up GHG inventories” - reportWorkshop "Atmospheric monitoring and inverse modelling for verification of national and EU bottomupGHG inventories " - reportchlorinated solvents (CCl 4 , CH 3 CCl 3 ), brominated organic compounds (halons,CH 3 Br) and HFCs (hydrofluorocarbons). Due to its broad coverage of Europe itprovides an important link between the global and regionally representativebackground concentrations.As an example the data series of HFC-134a is shown in Figure 2, where a commontrend in the background concentrations is overlaid by higher peak values atJungfraujoch and Monte Cimone, which are located nearer to important Europeansource regions in comparison to the more remote site of Mace Head and the Arcticsite of Ny-Alesund.HFC 134a200150ppt10050Monte CimoneJungfraujochMace HeadNy-Alesund02000 2001 2002 2003 2004Figure 2: Continuous in-situ measurements of HFC-134a at the four SOGE sites.Thus, as European sources can be detected at the SOGE stations, they providemeasurements which can be used are in support of the Kyoto and the Montrealprotocols, in assessing the compliance of European regions with the protocolrequirements. In particular the observation system has been set up to (i) detecttrends in the concentrations of greenhouse active and ozone-destroying halocarbons,(ii) verify reported emissions and validate emission inventories for a series ofhalocarbons for Europe as a whole as well as for certain regions, (iii) developobservational capacity for all halocarbons included in the Kyoto protocol for whichthis was previously not existing, and (iv) develop a strategy for a cost-effective longtermobservation system for halocarbons in Europe. The second objective has beento predict and assess impacts of the halocarbons on the climate and on the ozonelayer. This implies extensive exploitation of existing data.The European emissions of halocarbons are regularly estimated within SOGE withinseveral publications. For example, HCFC-141b emissions have been shown to have36