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Table 1

Notable assessments and model intercomparison projects that have included global models simulating tropospheric chemistry, since 2000. DOI: https://doi.org/10.1525/elementa.265.t1

Assessment and yearNumber of modelsBrief descriptionSelected References

 
OxCOMP, 1999 (Tropospheric oxidative state intercomparison project) 14 Impacts of emissions changes on atmospheric chemistry and greenhouse gases. Conducted in support of the IPCC Third Assessment Report (IPCC, 2001).
Mostly CTMs; some chemistry GCMs. 
Prather et al. (2001) 
ACCENT, 2005 (Atmospheric Composition Change: The European Network) 26 Impacts of emissions and climate change. Drawn on for the IPCC Fourth Assessment Report (IPCC, 2007) and coordinated as part of a European Union research network. Mostly CTMs, with a few chemistry GCMs and CCMs. Stevenson et al. (2006); http://www.accent-network.org 
HTAP, 2007, 2010, Phase 2 ongoing (Hemispheric Transport of Air Pollution) 21 Determine contribution of transboundary pollution from a source region to different receptor regions under present day and future scenarios, using (mostly) CTMs. Simulations informed the Convention on Long-range Transboundary Air Pollution (LRTAP). TF-HTAP (2007, 2010); Fiore et al. (2009); Wild et al. (2012); Doherty et al. (2013) 
CMIP5, 2012 (Coupled Model Intercomparison Project, phase 5) 46 (8 simulated chemistry online) Climate model experiments in support of the IPCC Fifth Assessment Report (2013). Limited number of CCMs, and very limited chemical output. Taylor et al. (2012); Eyring et al. (2013a) 
ACCMIP, 2012 (Atmospheric Chemistry and Climate Model Intercomparison Project) 15 Simulations with CCMs, chemistry GCMs and CTMs to supplement CMIP5. Simulations informed the IPCC Fifth Assessment Report (IPCC, 2013). Lamarque et al. (2013); Young et al. (2013) 
POLMIP, 2014
(POLARCAT Model Intercomparison Project) 
11 (9 global models) Evaluate global chemistry models against a large suite of atmospheric chemistry observations made during the International Polar Year (2008) in the Arctic as part of the Polar Study using Aircraft, Remote
Sensing, Surface Measurements and Models, of Climate,
Chemistry, Aerosols and Transport (POLARCAT) activity. Nudged CCMs and CTMs 
Emmons et al. (2015) 
CCMI, ongoing (Chemistry Climate Model Initiative) 23 Aimed at studying composition and chemistry in the combined stratosphere-troposphere system. Mostly CCMs (both nudged meteorology and free running with SST/sea-ice boundary conditions). Eyring et al. (2013b) 
AerChemMIP, 2017–2020
(The Aerosol Chemistry Model Intercomparison Project) 
TBC Contribution to CMIP6, the successor to CMIP5. Aimed at investigating historical and future change in the chemical composition of the stratosphere-troposphere system, as well as diagnosing chemistry-climate forcings and feedbacks, and global/regional climate responses. Model types as CCMI. Eyring et al. (2016), Collins et al. (2017) 
Assessment and yearNumber of modelsBrief descriptionSelected References

 
OxCOMP, 1999 (Tropospheric oxidative state intercomparison project) 14 Impacts of emissions changes on atmospheric chemistry and greenhouse gases. Conducted in support of the IPCC Third Assessment Report (IPCC, 2001).
Mostly CTMs; some chemistry GCMs. 
Prather et al. (2001) 
ACCENT, 2005 (Atmospheric Composition Change: The European Network) 26 Impacts of emissions and climate change. Drawn on for the IPCC Fourth Assessment Report (IPCC, 2007) and coordinated as part of a European Union research network. Mostly CTMs, with a few chemistry GCMs and CCMs. Stevenson et al. (2006); http://www.accent-network.org 
HTAP, 2007, 2010, Phase 2 ongoing (Hemispheric Transport of Air Pollution) 21 Determine contribution of transboundary pollution from a source region to different receptor regions under present day and future scenarios, using (mostly) CTMs. Simulations informed the Convention on Long-range Transboundary Air Pollution (LRTAP). TF-HTAP (2007, 2010); Fiore et al. (2009); Wild et al. (2012); Doherty et al. (2013) 
CMIP5, 2012 (Coupled Model Intercomparison Project, phase 5) 46 (8 simulated chemistry online) Climate model experiments in support of the IPCC Fifth Assessment Report (2013). Limited number of CCMs, and very limited chemical output. Taylor et al. (2012); Eyring et al. (2013a) 
ACCMIP, 2012 (Atmospheric Chemistry and Climate Model Intercomparison Project) 15 Simulations with CCMs, chemistry GCMs and CTMs to supplement CMIP5. Simulations informed the IPCC Fifth Assessment Report (IPCC, 2013). Lamarque et al. (2013); Young et al. (2013) 
POLMIP, 2014
(POLARCAT Model Intercomparison Project) 
11 (9 global models) Evaluate global chemistry models against a large suite of atmospheric chemistry observations made during the International Polar Year (2008) in the Arctic as part of the Polar Study using Aircraft, Remote
Sensing, Surface Measurements and Models, of Climate,
Chemistry, Aerosols and Transport (POLARCAT) activity. Nudged CCMs and CTMs 
Emmons et al. (2015) 
CCMI, ongoing (Chemistry Climate Model Initiative) 23 Aimed at studying composition and chemistry in the combined stratosphere-troposphere system. Mostly CCMs (both nudged meteorology and free running with SST/sea-ice boundary conditions). Eyring et al. (2013b) 
AerChemMIP, 2017–2020
(The Aerosol Chemistry Model Intercomparison Project) 
TBC Contribution to CMIP6, the successor to CMIP5. Aimed at investigating historical and future change in the chemical composition of the stratosphere-troposphere system, as well as diagnosing chemistry-climate forcings and feedbacks, and global/regional climate responses. Model types as CCMI. Eyring et al. (2016), Collins et al. (2017) 
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