WG2 - Emissions
Lead: NILU Co-lead: BSC Co-ordinator: L. Tarrason
The main focus of WG2 is on the evaluation of urban emissions. This is because the compilation of urban emissions has very irregular practices across European cities and it uses systematically different practices from emission compilation at national level. Emission compilation at urban level is an important cross cutting issue that also affects the work of the other three FAIRMODE working groups and cross-cutting activities.
A particular attention is given to the traffic sector emissions because they represent the dominant sources in most European urban areas. A wide range of different methodologies, with variable accuracy is currently used for calculating traffic emissions in urban areas so that guidance on best practices is expected to have an impact to improve existing emission estimates.
1 WG2 is compiling a review of existing traffic emission compilation methodologies, organized in different tiers, as increasingly demands for input data information apply. The work relies on the guidance for traffic emission compilation provided by regional and national emission inventory initiatives such as compiled under the EMEP/CORINAIR Guidebook, but extends beyond this to cover bottom-up approaches developed in local and urban inventories;
2 WG2 is also involved in the benchmarking of emission inventories in selected cities. The main goal is to show and interpret the large difference in traffic emission data from national and urban inventories resulting from the use of different emission compilation methodologies. Comparison with the TNO-MACC-II and other top-down emission inventories are carried out as part of this exercise. The main goal of this exercise is to identify the main differences between national and urban traffic inventories in the selected cities and provide explanations for these differences;
3 In future, WG2 will work to secure the consistency of the methodologies used for calculating city scale climate gas emissions and air quality emissions from the traffic sector. An outreach to existing networks, such as the International Council for Local Environmental Initiatives (ICLEI) will be pursued. As part of the work in WG2, the “FAIRMODE Emission Benchmarking Tool” has been developed to facilitate top-down vs bottom-up emission inventory comparisons. This benchmarking tool is commonly denominated as the “Δ-Emission Tool”.
Assessment of discrepancies between bottom-up and regional emission inventories in Norwegian urban areas, S. Lopez-Aparicio, M. Guevara, P. Thunis, K. Cuvelier, L. Tarrason, Atmospheric Environment, 154, 285-296, 2017.
A benchmarking tool to screen and compare bottom-up and top-down emission inventories, M. Guevara, S. Lopez-Aparicio, C. Cuvelier, L. Tarrason, A. Clappier and P. Thunis, Air Qual Atmos Health, 2016.
A novel approach to screen and compare bottom-up vs. top-down emission inventories, P. Thunis, B. Degraeuwe, K. Cuvelier, M. Guevara, L. Tarrason and A. Clappier, Air Qual Atmos Health, DOI 10.1007/s11869-016-0402-7, 2016.
Related tools: The Fairmode emission benchmarking tool