Upcoming changes to the EMEP grid Katarina Mareckova
- Slides: 16
Upcoming changes to the EMEP grid Katarina Mareckova, Robert Wankmueller TFEIP Workshop 4 May 2011, Stockholm
History From 1984 to 1998 a 150 x 150 km² grid was used From 1999 the grid resolution was changed to 50 x 50 km² but the covered area remained unchanged In 2008 the domain was extended to its current expansion to include EECCA countries and a larger part of the Russian Federation
Present gridding system Polar stereographic projection Grid resolution: 50 x 50 km² 10 SNAP sectors + National Total (sum of sectors) Pollutants MAIN: NOx, NMVOC, SOx, NH 3, CO) (since 2008 by CEIP, before MSC-W) PM (PM 2. 5, PMcoarse) (since 2008 by CEIP, before MSC-W) HM (Pb, Cd, Hg) (since 2009 by CEIP, before MSC-E) POPs (PCDD/PCDF, HCB, Ba. P) (since 2010 by CEIP, before MSC-E)
Proposed further modifications Change of the grid projection from the current polar- stereographic grid to geographical coordinates (latitude -longitude grid) Increase of the grid resolution (0. 2° x 0. 2° or even 0. 1° x 0. 1°) Gridding in GNFR sectors (introduced in 2009 with the new NFR reporting templates) instead of 10 SNAP sectors
Differences in grid cell areas
Reporting of gridded data New EMEP grid definition for all areas within the new EMEP domain Adaption of the reporting templates Gridded emissions have to be prapared in the new EMEP grid for reporting
New EMEP-Grid definition example Definition of a grid in geographic coordinates (WGS 84) for all areas within the new EMEP domain (including fraction numbers for border grid cells)
To. Do Grid definition for sea areas and the extended domain (Where should be the new grid domain borders? ) Agreement on GNFR sectors used for gridding Definition of new „proxy base grids“ (Derived from digitised maps, e. g. road network, shipping routes, airports, etc. ) Definition of new „base grids“ for the emission distribution of each pollutant and sector Derived from „proxy base grids“ and other spatial data (e. g. LPS data) Specification and implementation of a new gridding software
Current domain borders In polar stereographic projection 50 x 50 km² grid used until 2008 Extended area of the 50 x 50 km² grid used since 2009
Current domain borders In geographic coodinate system (WGS 84) 50 x 50 km² grid used until 2008 in WGS 84 New domain borders ? Extended area of the 50 x 50 km² grid used since 2009 in WGS 84
Current and suggested new domain borders 30°N-82°N, 30°W-90°E Figure provided by MSC-E
Estimated increase of grid data per year Current EMEP domain Ø 50 x 50 km² PS ~ 21. 000 cells x 10 SNAP sectors ~ 210. 000 values / pollutant Suggested new domain (30°N-82°N, 30°W-90°E) Ø 0. 5° x 0. 5° ~ 25. 000 cells x 15 GNFR sectors ~ 375. 000 values / pollutant Ø 0. 2° x 0. 2° ~ 156. 000 cells x 15 GNFR sectors ~ 2. 340. 000 values / pollutant Ø 0. 1° x 0. 1° ~ 624. 000 cells x 15 GNFR sectors ~ 9. 360. 000 values / pollutant
Reported gridded emissions from current reporting templates How to deal with reported gridded emissions from the current reporting templates, which are reported in the new GNFR sectors, but using the 50 x 50 km² grid? Possible solution: Ø Gridded emissions should be reported in the new EMEP grid if data in this resolution is available Ø Reported gridded emissions in the 50 x 50 km² grid are converted into the new grid and used in the gridding process among other proxy and LPS data Ø If no gridded emissions are reported, the distribution is performed with proxy and LPS data only
New gridded sectors Proposal for aggregation of the current GNFR sectors to be used in models (for reporting? )
Thank you for your attention
