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Resources","sub_category":"Air Quality","monthly_downloads":0,"total_dependent_repos":0,"total_dependent_packages":0,"readme":"# Open Source EMEP MSC-W model\n[![Documentation Status](https://readthedocs.org/projects/emep-ctm/badge/?version=latest)](http://emep-ctm.readthedocs.io/en/latest/?badge=latest)\n[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3265911.svg)](https://doi.org/10.5281/zenodo.3265911)\n\nThe EMEP models have been instrumental to the development of\nair quality policies in Europe since the late 1970s,\nmainly through their support to the strategy work under the\n[Convention on Long-range Transboundary Air Pollution][CLRTAP].\nIn the 1990s the EMEP models became also the reference tools for\natmospheric dispersion calculations as input to the Integrated Assessment Modelling,\nwhich supports the development of air quality polices in the European Union.\n\n[CLRTAP]:   http://www.unece.org/env/lrtap/welcome.html\n[GPLv3]:    http://www.gnu.org/copyleft/gpl.html\n[netCDF_CF]:http://www.unidata.ucar.edu/software/netcdf/conventions.html\n[guide]:    http://emep-ctm.readthedocs.io/en/latest\n[publ2025]: http://emep.int/publ/emep2025_publications.html\n[rel5.6]:   http://github.com/metno/emep-ctm/releases/tag/5.6\n[rel5.5]:   http://github.com/metno/emep-ctm/releases/tag/5.5\n[rel5.0]:   http://github.com/metno/emep-ctm/releases/tag/5.0\n[rel445]:   http://github.com/metno/emep-ctm/releases/tag/rv4_45\n[rel436]:   http://github.com/metno/emep-ctm/releases/tag/rv4_36\n[rel434]:   http://github.com/metno/emep-ctm/releases/tag/rv4_34\n[rel433]:   http://github.com/metno/emep-ctm/releases/tag/rv4_33\n[rel432]:   http://github.com/metno/emep-ctm/releases/tag/rv4_32\n[rel417]:   http://github.com/metno/emep-ctm/releases/tag/rv4_17\n[rel415]:   http://github.com/metno/emep-ctm/releases/tag/rv4_15\n[rel410]:   http://github.com/metno/emep-ctm/releases/tag/rv4_10\n[rel48]:    http://github.com/metno/emep-ctm/releases/tag/rv4_8\n[rel45]:    http://github.com/metno/emep-ctm/releases/tag/rv4_5\n[rel44]:    http://github.com/metno/emep-ctm/releases/tag/rv4_4\n[rel43]:    http://github.com/metno/emep-ctm/releases/tag/rv4_3\n[readme43]: http://github.com/metno/emep-ctm/releases/download/rv4_3/README_rv4_3special.txt\n[rel40]:    http://github.com/metno/emep-ctm/releases/tag/rv4_0\n[rel201106]:http://github.com/metno/emep-ctm/releases/tag/v201106\n[rel30]:    http://github.com/metno/emep-ctm/releases/tag/rv3\n\nThe EMEP MSC-W model is designed to calculate air concentrations\nand deposition fields for major acidifying and eutrophying pollutants,\nphoto-oxidants and particulate matter.\nThe Open Source releases are intended to:\n* facilitate insight in the model assumptions, the parametrisation used,\n  the requirements for input data and the actual model code\n* encourage dialogue and collaboration with the modelling community\n* allow individual model runs and insight on how to run different scenarios\n\n## Releases\n\nThe latest Open Source EMEP MSC-W model version ([5.6][rel5.6])\nis based on the version used on the [EMEP status reporting of the year 2025][publ2025].\nThe source code, together with a set of input data,\nan updated user guide and a full year model results for the year 2018,\nunder [GPL license v3][GPLv3].\n\nYou can download the source code and input data by following the instructions on the \n[OpenSource v5.6 (202511)][rel5.6] release page.\n\nInformation on use of the model can be found in the [EMEP MSC-W model User Guide][guide]\n\n#### Previous releases (YYYYMM - date of release)\n\n* [OpenSource v5.5 (202412)][rel5.5].\n* [OpenSource v5.0 (202310)][rel5.0].\n* [OpenSource rv4.45 (202203)][rel445].\n* [OpenSource rv4.36 (202011)][rel436].\n* [OpenSource rv4.34 (202001)][rel434].\n* [OpenSource rv4.33 (201906)][rel433].\n* [OpenSource rv4.32 (201904)][rel432].\n* [OpenSource rv4.17 (201802)][rel417].\n* [OpenSource rv4.15 (201709)][rel415].\n* [OpenSource rv4.10 (201609)][rel410].\n* [OpenSource rv4.8 (201510)][rel48].\n* [OpenSource rv4.5 (201409)][rel45].\n* [OpenSource rv4.4 (201309)][rel44].  \n* [OpenSource rv4.3 (201304)][rel43] *read the file [README_rv4_3special.txt][readme43]*.\n* [OpenSource rv4.0 (201209)][rel40].\n* [OpenSource v.2011-06 (201108)][rel201106].\n* [OpenSource rv3 (200802)][rel30].\n\n### Model domain and resolution\n\nThe EMEP MSC-W model is very flexible with regard to the horizontal resolution\nand vertical resolutions. In 2008 the EMEP domain was extended to include EECCA countries.\nIn 2017 the vertical resolution increased from 20 to 34 model levels.\nTogether wit the latest release gridded input and output data are provided on the `EMEP0302` model domain\nwith a 0.3x0.2 degrees on long-lat projection and 34 vertical levels.\n\n### Input data\n\nThe standard input files for the EMEP model are provided in two different formats,\nnetCDF or ASCII.\nWe presently follow as much as possible the [netCDF CF conventions][netCDF_CF]\nfor both input and output data.\nMore details about the input files are described in Chapter 2 of the\n[EMEP MSC-W model User Guide][guide].\n\n**IMPORTANT:**\nThe input data that accompanies each release model should be appropriately acknowledged\nwhen used for model runs.\nIf nothing else is specified according to references further in this chapter,\nplease acknowledge EMEP/MSC-W in any use of these data.\n\n### Model output\n\nThe main output files are in netCDF format\nand some additional output files are in ASCII format.\nDetails about the output files are described in Chapter 3 of the User Guide.\n\n## Documentation\nThe EMEP MSC-W model is a chemical transport model developed at the\nMeteorological Synthesizing Centre - West (MSC-W)\nat the Norwegian Meteorological Institute (met.no).\nThe EMEP model is a limited-area, terrain following hybrid coordinate model\ndesigned to calculate air concentration and deposition fields for\n\n* acidifying and eutrophying compounds (S, N)\n* ground level ozone (O3)\n* particulate matter (PM2.5, PM10).\n\nas well as their long-range transport and fluxes across national boundaries\n(Transboundary air pollution).\nA history of the development of the EMEP model can be found at\n[http://www.emep.int/models][mscwmodels].\n\n[mscwmodels]: http://www.emep.int/mscw/models.html#mscwmodels\n\n### Model Description\n\nThe main documentation is still the 2012 ACP paper:\n\nThe EMEP MSC-W chemical transport model -- technical description\nD. Simpson, A. Benedictow, H. Berge, R. Bergstrõm, L. D. Emberson, H. Fagerli,\nC. R. Flechard, G. D. Hayman, M. Gauss, J. E. Jonson, M. E. Jenkin, A. Nyíri,\nC. Richter, V. S. Semeena, S. Tsyro, J.-P. Tuovinen, Á. Valdebenito, and P. Wind\nAtmos. Chem. Phys., 12, 7825-7865, 2012\nhttp://www.atmos-chem-phys.net/12/7825/2012/acp-12-7825-2012.html\n\n... but many changes (some major) have been made since then. These changes are reported each year in the \"updates\" chapter of EMEP Status reports. The latest update concerns v5.6, and is:\n\nSimpson, D., Hood, C., van Caspel, W., Vieno, M. and Wind, P.: Updates to the EMEP/MSC-W model, 2024–2025, \nin: Transboundary particulate matter, photo-oxidants, acidifying and eutrophying components. \nEMEP Status Report 1/2025, The Norwegian Meteorological Institute, Oslo, Norway, 195–203, 2025.\nhttps://emep.int/publ/reports/2025/EMEP_Status_Report_1_2025.pdf\n\nPlease, when referring to the EMEP model, use the appropriate updates reference as well as the 2012 paper, e.g. Simpson et al., (2012, 2025, and references therein).\n\n## Running the model\n\nHow to submit a run is described in detail in Chapter 4\nof the [EMEP MSC-W model User Guide][guide].\n\nQuestions on the EMEP model can be submitted to the [issues tracker].\nSupport to the user community will be developed here with your contribution.\nPlease let us know what your needs for information are.\n\n[issues tracker]: https://github.com/metno/emep-ctm/issues\n\n### Computer requirements\n\nTo compile the EMEP model you need:\n\n* Fortran 95 compiler\n* NetCDF Library (\u003e4.1.3)\n* MPI Library (\u003e1.0)\n\nIt is necessary to compile with double precision reals (8 bytes reals).\nThe program has been used on computers ranging from a Linux laptop\nto supercomputers (Itanium2 cluster, Intel Xeon cluster, Cray XT4, IBM power5+).\nIt is compatible with all compilers tested so far: Intel, PGI, gfortran, XL fortran.\nA Makefile is included, the path to netcdf (INCL and LLIB) has to be adapted\nto your machine, and to the fortran compiler (F90) and flags (F90FLAGS)\nto the compiler you are using.\n\nThe code has been tested with 1 to 1024 CPUs, and scales well (for large grids).\nIf only one CPU is used 1-2 GB memory is required.\nIf more than one, for example 64 CPUs are used, 200 MB of memory per CPU is enough\n(in the case of a 132 X 159 grid size).\nFor runs on more than 32 CPUs, a fast interconnect is recommended\n(infiniband for example), for smaller runs, gigabit ethernet is sufficient.\nIt takes ~3.5 hrs on 64*Xeon X5355 (2.66GHz) for a 1-year simulation.\n\nWhen downloading input data in order to do a \"base run\" please make sure that there\nare 35 Gb disc space available, especially due to large meteorology input files.\nThe model can be run for shorter periods, users can download meteorology for\nonly the period they are interested in, plus one day.\n\n## Verification\n\nThe EMEP MSC-W model is validated and reported to the\nCooperative Programme for Monitoring and Evaluation of the\nLong-range Transmission for Air Pollutants in Europe ([EMEP][]) each year\nby the EMEP/MSC-W group.\nThe reports can be found under the following links:\n* [Status Reports][]\n* [Country Reports][]\n\n[EMEP]:           http://www.emep.int/\n[Status Reports]: http://www.emep.int/publ/common_publications.html\n[Country Reports]:http://www.emep.int/mscw/mscw_datanotes.html\n\n## Citation\n\n``` bibtex\n@article{emep-mscw_2012,\n  author = {Simpson, D. and Benedictow, A. and Berge, H. and Bergstr\\\"om, R. and Emberson, L. D. and \n            Fagerli, H. and Flechard, C. R. and Hayman, G. D. and Gauss, M. and Jonson, J. E. and\n            Jenkin, M. E. and Ny\\'{\\i}ri, A. and Richter, C. and Semeena, V. S. and Tsyro, S. and\n            Tuovinen, J.-P. and Valdebenito, \\'A. and Wind, P.},\n  title = {The EMEP MSC-W chemical transport model \u0026ndash; technical description},\n  journal = {Atmospheric Chemistry and Physics},\n  volume = {12},\n  year = {2012},\n  number = {16},\n  pages = {7825--7865},\n  doi = {10.5194/acp-12-7825-2012},\n  url = {https://www.atmos-chem-phys.net/12/7825/2012/}\n}\n\n@misc{emep-ctm_v5.6,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model v5.6 (202511)},\n  month        = nov,\n  year         = 2025,\n  doi          = {10.5281/zenodo.17648259},\n  url          = {https://doi.org/10.5281/zenodo.17648259}\n}\n\n@misc{emep-ctm_v5.5,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model v5.5 (202412)},\n  month        = dec,\n  year         = 2024,\n  doi          = {10.5281/zenodo.14507729},\n  url          = {https://doi.org/10.5281/zenodo.14507729}\n}\n\n@misc{emep-ctm_v5.0,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model v5.0 (202310)},\n  month        = oct,\n  year         = 2023,\n  doi          = {10.5281/zenodo.8431553},\n  url          = {https://doi.org/10.5281/zenodo.8431553}\n}\n\n@misc{emep-ctm_rv4.45,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model rv4.45 (202203)},\n  month        = mar,\n  year         = 2022,\n  doi          = {10.5281/zenodo.8337953},\n  url          = {https://doi.org/10.5281/zenodo.8337953}\n}\n\n@misc{emep-ctm_rv4.36,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model rv4.36 (202011)},\n  month        = nov,\n  year         = 2020,\n  doi          = {10.5281/zenodo.4230110},\n  url          = {https://doi.org/10.5281/zenodo.4230110}\n}\n\n@misc{emep-ctm_rv4.34,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model rv4.34 (202001)},\n  month        = jan,\n  year         = 2020,\n  doi          = {10.5281/zenodo.3647990},\n  url          = {https://doi.org/10.5281/zenodo.3647990}\n}\n\n@misc{emep-ctm_rv4.33,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model rv4.33 (201906)},\n  month        = jun,\n  year         = 2019,\n  doi          = {10.5281/zenodo.3265912},\n  url          = {https://doi.org/10.5281/zenodo.3265912}\n}\n\n@misc{emep-ctm_rv4.17,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model rv4.17 (201802)},\n  month        = feb,\n  year         = 2018,\n  doi          = {10.5281/zenodo.3355023},\n  url          = {https://doi.org/10.5281/zenodo.3355023}\n}\n\n@misc{emep-ctm_rv4.15,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model rv4.15 (201709)},\n  month        = sep,\n  year         = 2017,\n  doi          = {10.5281/zenodo.3355041},\n  url          = {https://doi.org/10.5281/zenodo.3355041}\n}\n\n@misc{emep-ctm_rv4.10,\n  author       = {EMEP MSC-W},\n  title        = {Open Source EMEP/MSC-W model rv4.10 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