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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 " - reportwhich real operational measurements have been acquired by the 8 Tall Towers. The6-month extension granted allowed us to create a reasonable amount of intercalibratedand high quality continous measurements series at almost all towers. Mostmeasurements will continue after the end of the project in the framework of theCarboEurope IP as far as can be foreseen now.The CHIOTTO Tower data will provide a wealth of information on GHG sources andsinks, where the tall towers allow to overcome some observational problems of thesurface based measurements:- Less sensitive to very near-field (less bias), more representative on model-scale- Better estimate of Boundary Layer average concentration: full transport flux- Continuous data- Multi-componentCurrent transport models to describe the fate of atmospheric tracers folllowingemission have been improved over the last years so we can start exploiting theinformation content of the tall tower surface observations.ReferencesHaszpra, L., Barcza, Z., Davis, K., Tarczay, K., Long term tall tower carbon dioxide fluxmonitoring over an area of mixed vegetation. Agricultural and Forest Meteorology, 132,58-77, 2005:Haszpra L., Barcza, Z., Tarczay, K., National report on the Hungarian CO 2 monitoring andresearch programs. In: 12th WMO/IAEA meeting of experts on carbon dioxideconcentration and related tracer measurement techniques, Toronto, Canada, 15-18September 2003 (eds.: Worthy, D., Huang, L.). WMO GAW Report No. 161., 154-158,2005.Haszpra L., Barcza, Z., CO 2 monitoring and research programs in Hungary. In: 13thWMO/IAEA meeting of experts on carbon dioxide concentration and related tracermeasurement techniques, Boulder, Colorado, U.S.A., 19-23 September 2005 (ed.: Miller,J.). WMO GAW Report (submitted), 2006.Pieterse G., A. Bleeker, A.T. Vermeulen, Y. Wu and J.W. Erisman, High resolution modelingof atmosphere-canopy exchange of acidifying and eutrophying components and carbondioxide for European forests. Tellus B, submitted, 2006.Vermeulen A.T., G. Pieterse, A. Hensen, W.C.M. van den Bulk, and J.W. Erisman, COMET:A Lagrangian transport model for greenhouse gas emission. Forward model techniqueand performance for methane. Atmos. Chem. Phys. Discuss., 6, 8727–8779, 2006.Vermeulen A.T., L. Haszpra, A. Lindroth, A. Manning, C. Messager, E. Moors, J. Mon-crieff,G. Pieterse, E. Popa, M. Schmidt, P. Stefani, The CHIOTTO tall tower program inEurope: first results. In: 13th WMO/IAEA meeting of experts on carbon dioxideconcentration and related tracer measurement techniques, Boulder, Colorado, U.S.A.,19-23 September 2005 (ed.: Miller, J.). WMO GAW, Vienna, Report nr 168, 2006.20