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Upcoming changes to the EMEP grid

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

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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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