Upcoming changes to the EMEP grid

Katarina Mareckova, Robert WankmuellerTFEIP 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 projectionGrid resolution: 50 x 50 km²10 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)

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 exampleDefinition of a grid in geographic coordinates

(WGS84) for all areas within the new EMEP domain (including fraction numbers for border grid cells)

ToDoGrid 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 (WGS84)

50 x 50 km² grid used until 2008 in WGS84

Extended area of the 50 x 50 km² grid used since 2009 in WGS84

New domain borders ?

Current and suggested new domain borders

30°N-82°N, 30°W-90°EFigure provided by MSC-E

Estimated increase of grid data per yearCurrent EMEP domain

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)0.5° x 0.5° ~ 25.000 cells

x 15 GNFR sectors ~ 375.000 values / pollutant

0.2° x 0.2° ~ 156.000 cells x 15 GNFR sectors ~ 2.340.000 values / pollutant

0.1° x 0.1° ~ 624.000 cells x 15 GNFR sectors ~ 9.360.000 values / pollutant

Reported gridded emissions from current reporting templatesHow 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:Gridded emissions should be reported in the new

EMEP grid if data in this resolution is availableReported 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

If no gridded emissions are reported, the distribution is performed with proxy and LPS data only

New gridded sectorsProposal for aggregation of the current GNFR

sectors to be used in models (for reporting?)

Thank you for your attention