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Upcoming changes to the EMEP grid

The EMEP grid system is undergoing significant changes to improve its resolution and reporting templates. The current 50x50 km² grid, utilized since 1999, will transition towards a more precise geographical coordinate system. Proposed modifications include increasing resolution to 0.2° x 0.2° or 0.1° x 0.1°, and adapting the grid for GNFR sectors. Additionally, gridded emissions will be reported using enhanced definitions and methodologies, ensuring comprehensive emission distribution across pollutants. These improvements aim to streamline reporting and increase data accuracy.

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Upcoming changes to the EMEP grid

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  1. Upcoming changes to the EMEP grid Katarina Mareckova, Robert WankmuellerTFEIP Workshop 4 May 2011, Stockholm

  2. 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

  3. 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, NH3, CO)(since 2008 by CEIP, before MSC-W) • PM (PM2.5, PMcoarse)(since 2008 by CEIP, before MSC-W) • HM (Pb, Cd, Hg) (since 2009 by CEIP, before MSC-E) • POPs (PCDD/PCDF, HCB, BaP)(since 2010 by CEIP, before MSC-E)

  4. 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

  5. Differences in grid cell areas

  6. 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

  7. New EMEP-Grid definition example • Definition of a grid in geographic coordinates (WGS84) for all areas within the new EMEP domain (including fraction numbers for border grid cells)

  8. ToDo • 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

  9. Current domain borders In polar stereographic projection Extended area of the 50 x 50 km² gridusedsince 2009 50 x 50 km² griduseduntil 2008

  10. Current domain borders In geographic coodinate system (WGS84) 50 x 50 km² griduseduntil 2008 in WGS84 Extended area of the 50 x 50 km² gridusedsince 2009 in WGS84 New domainborders ?

  11. Current and suggested new domain borders 30°N-82°N, 30°W-90°E Figure provided by MSC-E

  12. Estimated increase of grid data per year • Current EMEP domain • 50 x 50 km² PS ~ 21.000 cellsx 10 SNAP sectors ~ 210.000 values / pollutant • Suggested new domain (30°N-82°N, 30°W-90°E) • 0.5° x 0.5° ~ 25.000 cellsx 15 GNFR sectors ~ 375.000 values / pollutant • 0.2° x 0.2° ~ 156.000 cellsx 15 GNFR sectors ~ 2.340.000 values / pollutant • 0.1° x 0.1° ~ 624.000 cellsx 15 GNFR sectors ~ 9.360.000 values / pollutant

  13. Reported gridded emissions from current reporting templates • Howto deal withreported gridded emissionsfromthecurrentreportingtemplates, whicharereported in thenew GNFR sectors, but usingthe 50 x 50 km² grid? Possiblesolution: • Gridded emissionsshouldbereported in thenew EMEP gridif data in thisresolutionisavailable • Reported gridded emissions in the 50 x 50 km² gridareconvertedintothenewgrid and used in thegriddingprocessamongotherproxy and LPS data • Ifno gridded emissionsarereported, thedistributionisperformedwithproxy and LPS data only

  14. New gridded sectors • Proposalforaggregation of thecurrent GNFR sectorstobeused in models (forreporting?)

  15. Thank you for your attention

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