The new EMEP grid in geographic coordinate system
Spatial emission mapping
Reported spatial emission data are input for models used to assess atmospheric concentrations and deposition, as the spatial location of emissions determines to great extent their atmospheric dispersion patterns and impact area. The results of model assessments inform national and international policies used to improve the environment and human health.
The area within which, coordinated by the international centers of EMEP, monitoring is carried out is defined as geographical scope of EMEP.
At the 36th session of the EMEP Steering Body the EMEP Centers suggested to increase spatial resolution of reported emissions from 50x 50 km EMEP grid to 0.1° × 0.1° long-lat in a geographic coordinate system (WGS84) to improve quality of monitoring. The new EMEP domain covers the geographic area between 30°N-82°N latitude and 30°W-90°E longitude. This suggestion represents a balance between political needs, scientific needs and technical feasibility as of 2012 and for the next years.
How to grid national emissions
Please have a look at chapter 7 of the EMEP/EEA air pollutant emission inventory Guidebook 2016, which is about spatial mapping of emissions and which provides guidance on compiling spatial emission datasets. It focuses on methods suitable for generating and reporting spatial data required under the CLRTAP that are consistent with nationally reported inventories under CLRTAP.
CEIP gridded 2011 reported data in the new resolution (0.1x0.1 long-lat) for main pollutants and PM. Distribution matrices (proxy grids) for individual categories have been prepared by the use of spatial sectoral proxy data derived directly from "JRC/EDGAR v4.2 grids" and "EDGAR proxy datasets" except for the United Kingdom where national gridded data have been submitted to EMEP. If countries do not report sectoral gridded emissions, CEIP will use this distribution when preparing data for modelers.
Country specific data defining the grid cells and fraction of grid cells can be downloaded here.
Reporting of gridded emissions
The reporting of gridded emissions in the new resolution (0.1x0.1 long/lat) and GNFR14 is requested from 2017 onwards (ECE/Ab.AIR/122/Add.1, decisions 2013/3 and 2013/4). Countries are invited to submit gridded data in the new resolution on voluntary basis at any time. If countries plan to report gridded data in the old resolution (50x50km²), it should be reported in old (2009) templates.
First results of the new gridding system - gridded SOx, NOx, NMVOC, NH3, CO, PM2.5, PM10 and PMcoarse emissions for year 2011 - are now available along with information on gap-filling and spatial disaggregation on sectoral level.
Countries should check the emission distribution and provide feedback to CEIP.