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ccc & msc-w - EMEP

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The following tables show the 1997 source-receptor matrices for oxidised sulphur, oxidised<br />

nitrogen and reduced sulphur as calculated by the Eulerian model. Comparison with previous<br />

source-receptor matrices calculated with the Lagrangian model show satisfactorily that the<br />

Eulerian model manages to account for the “indeterminate deposition” of the previous<br />

Lagrangian budget calculations.<br />

The Eulerian model manages to allocate the “indeterminate” contribution thus increasing the<br />

actual contribution of different countries. In many cases, the contribution of the country to<br />

itself increases in the 1997 simulations. This is particularly true in source areas and for<br />

Mediterranean countries. The deposition of Spanish emissions in Spain increases in 1997 with<br />

respect to previous years, particularly for oxidised nitrogen and this seems to be related to an<br />

increase in the dry deposition calculated by the Eulerian model.<br />

It is not clear at this point whether this is a feature of the Eulerian model or if it is a<br />

consequence of the particular meteorological variations during 1997. Still, it can be concluded<br />

that ifferences between the source-receptor matrices produced by Eulerian and the Lagrangian<br />

models are within the range expected from different meteorological variations.<br />

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