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, 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 (latitudelongitude 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 (WGS84) for
all areas within the new EMEP domain (including fraction
numbers for border grid cells)
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
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
New domain borders ?
Extended area of the
50 x 50 km² grid used
since 2009 in WGS84
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
 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 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:
 Gridded emissions should be reported in the new EMEP grid if
data in this resolution is available
 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
 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