The depositions of sulphur (S) and nitrogen (N), and air concentrations of ozone (O3) and particulate matter (PM)
available here are calculated with the EMEP MSC-W model as reported in
the annual EMEP status reports.
The source-receptor (SR) relationships give the change in air concentrations or depositions resulting from a change in emissions from each
emitter country. For each country, reductions in five different pollutants have been calculated separately: with an emission reduction of 15%
for SOx, NOx, NH3, NMVOC and PPM10 (as a sum of PPM2.5 and PPMcoarse) respectively.
The deposition tables show the contribution from one country to another. They have been calculated adding the differences obtained by a 15%
reduction for all emissions in one country multiplied by a factor of 100/15, in order to arrive at total estimates.
For the concentrations and indicator tables, the differences obtained by the 15% emission reduction of the relevant pollutants are given directly.
Thus, the tables should be interpreted as estimates of this reduction scenario from the chemical conditions of the given year.
More information about SR calculations can be found in chapter 5 of
EMEP Status Report 1/2018 and definitions of compounds in chapter 1.2 of latest
EMEP Status Report.
As the EMEP MSC-W model calculations are changing with time, not only because of
EMEP MSC-W model updates, but also due to modifications of
the input data (e.g. revised emission data and
meteorology). In broad terms, two types of model results can be distinguished:
Type1) Model results that have been officially reported in the annual EMEP
status reports, based on model simulations using the best available input data
(emissions, meteorology, etc.) at the time of reporting.
Type2) Model results from later re-calculations, using updated input data
which were not available at the time of reporting (e.g. revised and improved
emission data for the past, meteorological data on finer resolution, etc.)
Model results of Type1 are labeled by the year they are calculated for (e.g.
'*2019met*' etc.), while model results of Type2 are further labeled by the
year when the re-calculation was made. E.g. '*2018met_2018emis_rep2021*'
refers to model results for the year 2018, which were obtained in 2021 using
the best data available in 2018. Model results of Type2 should be preferred
when doing trend analyses.
 Total deposition of oxidized sulphur (Dry+Wet oxS = DDEP_SOX_m2Grid+WDEP_SOX), Total deposition of oxidized nitrogen
(Dry+Wet oxN = DDEP_OXN_m2Grid+WDEP_OXN), Total deposition of reduced nitrogen (Dry+Wet RdN = DDEP_RDN_m2Grid+WDEP_RDN)
DEP_SOX (SO2, SO4), WDEP_SOX (SO2, SO4), DDEP_OXN (NO2, PAN, MPAN, HNO3, HONO, NO3_f, NO3_c), WDEP_OXN (HNO3, HONO, NO3_f, NO3_c), DDEP_RDN (NH3, NH4_f), WDEP_RDN (NH3, NH4_f)
and more information can be found in Simpson, 2012