Mean European CH4 emissions for the period 2001-2006 derived by the JRC inverse modelling system [Bergamaschi et al., 2010]. Filled circles - stations which take continuous measurements; Open circles - stations which take weekly measurements.
IES scientists developed a sophisticated inverse modelling system called TM5-4DVAR, for atmospheric CH4 and N2O, based on a global 3-D atmospheric transport model. Atmospheric observations from monitoring stations are assimilated by the inverse model, which optimises the emissions applied in the model until an optimal agreement between simulated and observed concentrations is achieved.
In 2010, the model was applied to estimate the European CH4 emissions over the period 2001-2006, using atmospheric observations from European and global surface monitoring stations [Bergamaschi et al., 2010]. For global inverse modelling, also satellite data are used, such as from the SCIAMACHY (SCanning Imaging Absorption spectroMeter for Atmospheric CartograpHY) instrument on board the European environment research satellite ENVISAT [Bergamaschi et al., 2009]. Such satellite based global CH4 inversions are now performed pre-operationally in the framework of the MACC (Monitoring Atmospheric Composition and Climate) project.
To further improve the top-down emission estimates, long-term high-quality atmospheric measurements are necessary. The IES is involved in an integrated European monitoring network currently prepared by the new European research infrastructure project ICOS (Integrated Carbon Observations System). Its aim is to quantify and understand the greenhouse balance of the European continent and of adjacent regions and to provide atmospheric and ecosystem data for research and political decision-making. The ICOS Research Infrastructure was selected by the European Strategy Forum for Research Infrastructures (ESFRI) roadmap in October 2006 as one of the vital new European Research Infrastructures for the next 20 years. The Carbon Portal, a common data centre, will provide free access to ICOS data services.
Peter Bergamaschi – Tel: +(39) 0332 789621 E-mail: peter.bergamaschi(at)jrc.ec.europa.eu