UKESM1 diagnostics for CMIP6 ScenarioMIP and CMIP historical experiments

Model output from the UKESM1 Earth System Model for experiments described in Archer-Nicholls et al. DOI:10.5194/acp-2022-706. Data from five experiments are included here: ScenarioMIP SSP1-2.6 (ssp126), SSP2-4.5 (ssp245), SSP3-7.0 (ssp370), SSP5-8.5(ssp585) experiments and the CMIP Historical experiment (hist). For the ScenarioMIP experiments, data are archived for the years 2090-2094 inclusive. For the CMIP Historical experiment, data are archived for the years 1850-1854 inclusive. The data comprise monthly mean output from both environmental variables, tracer mass mixing ratio and chemical reaction tendencies in moles per gridbox per second so as to be able levels of the nitrate radical and its principal chemical sinks consistent with the analysis in Archer-Nicholls et al. Other relevant data may be found in the CMIP6 archive for CMIP and ScenarioMIP hosted at the Centre for Environmental Data Analysis (CEDA) and at the Earth System Federation Grid. The experiments described in Archer-Nicholls et al. target the controlling factors for the gas phase nitrate (NO3) radical species, focusing on CMIP6 CMIP and ScenarioMIP experiments which have already been uploaded to CEDA and the Earth System Federation Grid (historical data are available via DOI:10.22033/ESGF/CMIP6.6113 and ScenarioMIP data via DOI:10.22033/ESGF/CMIP6.1567) and we provide here additional diagnostic output for these reference datasets/experiments, necessary to reproduce the figures in Archer-Nicholls et al. The analysis in Archer-Nicholls et al. uses the CMIP Historical experiment, described in Eyring et al. (2016) (DOI:10.5194/gmd-9-1937-2016 and ScenarioMIP SSP1-26, SSP2-45, SSP3-70 and SSP5-85 experiments described in O'Neill et al. (2016) (DOI:10.5194/gmd-9-3461-2016), with emissions given in Gidden et al.(2019) (DOI:10.5194/gmd-12-1443-2019). The data presented here are from experiments using UKESM1 described in Sellar et al. (2019) (DOI:10.1029/2019MS001739) run on UK supercomputing platform MONSooN. Acronyms --------------------- CMIP6: the sixth phase of the Coupled Model Intercomparison Project. ScenarioMIP: the Scenario Model Intercomparison Project simulates climate outcomes based on alternative plausible future scenarios. SSP1-26: experiment based on Shared Socioeconomic Pathway SSP1 with low climate change mitigation and adaptation challenges and RCP2.6, a future pathway with a radiative forcing of 2.6 W/m2 in the year 2100. SSP2-45: experiment based on Shared Socioeconomic Pathway SSP2 with medium challenges to climate change mitigation and adaptation and RCP4.5, a future pathway with a radiative forcing of 4.5 W/m2 in the year 2100. SSP3-70: experiment based on Shared Socioeconomic Pathway SSP3 which is characterised by high challenges to both mitigation and adaptation and RCP7.0, a future pathway with a radiative forcing of 7.0 W/m2 in the year 2100. SSP5-85: experiment based on Shares Socioeconomic Pathway SSP5 where climate change mitigation challenges dominate and RCP8.5, a future pathway with a radiative forcing of 8.5 W/m2 in the year 2100.