Earlier reported EMEP MSC-W modelled air concentrations and depositions

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 earlier reported in the annual EMEP status reports.

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Data produced by EMEP/MSC-W are licensed under Norwegian license for public data (NLOD) and Creative Commons 4.0 BY International. Credit should be given to The Norwegian Meteorological institute, shortened "MET Norway", as the source of data. Some suggestions: "Data from The Norwegian Meteorological Institute", "Based on data from MET Norway".

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• Gridded data on NetCDF format
Earlier reported yearly, monthly, daily and hourly gridded NetCDF ( CF convention) files are available on EMEP 0.1º x 0.1º longitude-latitude grid (EMEP_gridding_system_documentation, EMEP01 domain map) (also on EMEP grid (50x50 km²) (EMEP50km) for years during transition to new grid) for the modelled compounds from the met.no THREDDS data server ( TDS) with OPeNDAP access (Data viewers are available for plotting.) More information about the model runs and grid domain can be found in the References and definitions of compounds in chapter 1.2 of corresponding EMEP Status Report.

Results for YEAR (TYPE)	TIME RESOLUTION	GRID	reported in (citation)
2020 (Type1) 2000-2019 (Type2)	year+month+day+hour	EMEP01deg	EMEP Status Report 1/2022
2019 (Type1) 2000-2018 (Type2)	year+month+day+hour	EMEP01deg	EMEP Status Report 1/2021
2019 (2018 emissions) 2018 (Type1)	year+month+day+hour	EMEP01deg	EMEP Status Report 1/2020
2018 (2017 emissions) 2017 (Type1) 2000-2016 (Type2)	year+month+day+hour	EMEP01deg	EMEP Status Report 1/2019
2017 (2016 emissions) 2016 (Type1) 2000-2015 (Type2)	year+month+day+hour	EMEP01deg	EMEP Status Report 1/2018
2015	year	EMEP01deg	EMEP Status Report 1/2017
2014	year+month+day+hour	EMEP50km	EMEP Status Report 1/2016
2013	year+month+day+hour	EMEP50km+EMEP01deg	EMEP Status Report 1/2015

The NetCDF files have the following convention:
{GRID}_{MODEL VERSION}_{TIME RESOLUTION}.{YEAR}met_{EMISSION YEAR}emis_({REPORTING YEAR}).nc

 

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Types of model calculations

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 re-calculations, using updated input data which were not available at the time of that reported year in previous EMEP status reports (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 2021. Model results of Type2 should be preferred when doing trend analyses, with caution to available model input data for the particular years.

 

Compounds in NetCDF files

These are the compounds found in the NetCDF files from EMEP MSC-W model calculations available from THREDDS per reported year.

• Gases and Aerosols in Air
  • SO2 --- SURF_ug_SO2
  • SO4 --- SURF_ug_SO4
  • NO2 --- SURF_ppb_NO2
  • NH3 --- SURF_ug_NH3
  • Nitrogen Oxides NOx (NO2+NO) --- SURF_ugN_NOX
  • Reduced Nitrogen NHx (NH3+NH4+) --- SURF_ugN_RDN
  • Oxidised Nitrogen OxN (HNO3+NO3) --- SURF_ugN_OXN
  • fine NO3 --- SURF_ug_NO3_F
  • coarse NO3 --- SURF_ug_NO3_C
  • fine NH4 (includes partition of coarse NH4) --- SURF_ug_NH4_F
  • PM10 dry --- SURF_ug_PM10
  • PM2.5 dry ([3]) --- SURF_ug_PM25
  • PM10 including PMwater at rh=50% --- SURF_ug_PM10_rh50
  • PM2.5 including PMwater at rh=50% ([3]) --- SURF_ug_PM25_rh50
  • PM2.5 water at rh=50% (conditioning requirement for PM gravimetric measurements, [3]) --- SURF_PM25water
  • PMco --- SURF_ug_PMCO
  • PPM2.5 --- SURF_ug_PPM25
  • PPMco --- SURF_ug_PPM_C
  • Sea Salt --- SURF_ug_SS
  • Dust --- SURF_ug_DUST
  • Coarse Elemental Carbon --- SURF_ug_ECCOARSE
  • Fine Elemental Carbon --- SURF_ug_ECFINE

• Ground Level Ozone [2]
  • O3 --- SURF_ppb_O3
  • MAXO3 --- SURF_MAXO3
  • Ozone Means over 35 ppb --- SOMO35
  • Accumulated Ozone over 40 ppb for forest --- EUAOT40_Forests
  • Accumulated Ozone over 40 ppb for agricultural crops --- EUAOT40_Crops
  • Accumulated Ozone over 40 ppb for forest at upper canopy (MM=(UNECE) Mapping Manual, IAM=Integrated Assessment Modelling, DF=Decidous Forest) --- MMAOT40_IAM_DF
  • Accumulated Ozone over 40 ppb over growing season for wheat (as a surrogate for temperate crops) (MM=(UNECE) Mapping Manual, IAM=Integrated Assessment Modelling, CR=CRops) --- MMAOT40_IAM_CR
  • Ozone Fluxes for deciduous forests (POD1 gen forest, IAM=Integrated Assessment Modelling, DF=Decidous Forest) (Only available since EMEP Status Report 1/2019 due to revision) --- POD1_IAM_DF
  • Ozone Fluxes for growing season (POD3 gen crops, IAM=Integrated Assessment Modelling, DF=Decidous Forest) (Only available since EMEP Status Report 1/2019 due to revision) --- POD3_IAM_CR

• Deposition [3]
  • Dry deposition of oxidized sulphur per m2 grid --- DDEP_SOX_m2Grid
  • Dry deposition of oxidized sulphur per m2 Coniferous Forest --- DDEP_SOX_m2Conif
  • Dry deposition of oxidized sulphur per m2 Decidous Forest --- DDEP_SOX_m2Decid
  • Dry deposition of oxidized sulphur per m2 Seminatural --- DDEP_SOX_m2Seminat
  • Wet deposition of oxidized sulphur --- WDEP_SOX
  • Dry deposition of oxidized nitrogen per m2 grid --- DDEP_OXN_m2Grid
  • Dry deposition of oxidized nitrogen per m2 Coniferous Forest --- DDEP_OXN_m2Conif
  • Dry deposition of oxidized nitrogen per m2 Decidous Forest --- DDEP_OXN_m2Decid
  • Dry deposition of oxidized nitrogen per m2 Seminatural --- DDEP_OXN_m2Seminat
  • Wet deposition of oxidized nitrogen --- WDEP_OXN
  • Dry deposition of reduced nitrogen per m2 grid --- DDEP_RDN_m2Grid
  • Dry deposition of reduced nitrogen per m2 Coniferous Forest --- DDEP_RDN_m2Conif
  • Dry deposition of reduced nitrogen per m2 Decidous Forest --- DDEP_RDN_m2Decid
  • Dry deposition of reduced nitrogen per m2 Seminatural --- DDEP_RDN_m2Seminat
  • Wet deposition of reduced nitrogen --- WDEP_RDN
  • Precipitation --- WDEP_PREC

 

[1] Further definitions and acronyms are updated in Chapter 1.2 from latest EMEP Status Reports and more information can be found in Simpson, 2012

[2] 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

[3] NO3 in PM2.5 (includes 27% of coarse NO3: SURF_ug_NO3_F+ 0.27*SURF_ug_NO3_C)

Model versions

• 2020: EMEP/MSC-W model version rv4.45
• 2019: EMEP/MSC-W model version rv4.36
• 2018: EMEP/MSC-W model version rv4.34
• 2017: EMEP/MSC-W model version rv4.33
• 2016: EMEP/MSC-W model version rv4.17a
• 2015: EMEP MSC-W model version rv4.15
• 2014: EMEP/MSC-W model version rv4.9
• 2013: EMEP MSC-W model version rv4.7

 

Meteorology

• 2021 ECMWF-IFS Cycle 46r1
• 2020-2014: ECMWF-IFS Cycle 40r1
• 2013: ECMWF-IFS Cycle 38r2

 

Emissions

The emissions used for the yearly model calculations have been derived from each years official data submissions to CEIP emission database/UNECE CLRTAP and are documented in the appendix of the respective EMEP Status Reports listed below.

 

References

• Trends of Air-concentrations and depositions:
  Transboundary particulate matter, photo-oxidants, acidifying and eutrophying components, EMEP Status Report 1/2022, ISSN 1504-6109 (print), ISSN 1504-6192 (online)
  Transboundary particulate matter, photo-oxidants, acidifying and eutrophying components, EMEP Status Report 1/2021, ISSN 1504-6109 (print), ISSN 1504-6192 (online)
  Transboundary particulate matter, photo-oxidants, acidifying and eutrophying components, EMEP Status Report 1/2020, ISSN 1504-6109 (print), ISSN 1504-6192 (online)
  Transboundary particulate matter, photo-oxidants, acidifying and eutrophying components, EMEP Status Report 1/2019, ISSN 1504-6109 (print), ISSN 1504-6192 (online)
  Transboundary particulate matter, photo-oxidants, acidifying and eutrophying components, EMEP Status Report 1/2018, ISSN 1504-6109 (print), ISSN 1504-6192 (online)
  Transboundary particulate matter, photo-oxidants, acidifying and eutrophying components, EMEP Status Report 1/2017, ISSN 1504-6109 (print), ISSN 1504-6192 (online)
  Transboundary particulate matter, photo-oxidants, acidifying and eutrophying components, EMEP Status Report 1/2016, ISSN 1504-6109 (print), ISSN 1504-6192 (online)
  Transboundary particulate matter, photo-oxidants, acidifying and eutrophying components, EMEP Status Report 1/2015, ISSN 1504-6109 (print), ISSN 1504-6192 (online)
• Model Description:
  The EMEP MSC-W chemical transport model -- technical description, Simpson et al, Atmos. Chem. Phys., 12, 7825-7865, 2012
• EMEP grid documentation (emissions):
  Documentation of the new emep gridding system Technical report CEIP 06/2019
• EMEP grid definitions and tools (model output):
  The EMEP grid

 

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emep.mscw@met.no