Emissions and climate effects due to the COVID-19 response Both sector and national emission files are given as well as the code to create them from mobility data Sector csv files have aviation and shipping by nation. National csv files have international aviation and shipping as a separate nation. See https://github.com/Priestley-Centre/COVID19_emissions for more details Monthly emissions and concentrations for the effects of the Covid-19 pandemic and resulting society response. All scenarios should be compared to the input4MIPS SSP245 baseline https://esgf-node.llnl.gov/search/input4mips/ Four scenarios are given for departures from the SSP245 baseline. The baseline is also provided for convenience. Scenarios depart after the start of 2020. Monthly concentrations of CO2, CH4 and N2O are provided over 2015-2050. For short-lived species emissions are provided for BC, CO, OC, SO2, NH3, NOx, & NMVOCs. Monthly values for years:2015,2019,2020,2021,2023,2030,2040 and 2050 are provided for the four scenarios and baseline. The SSP245 baseline is also available from the input4MIPS website. NOx emissions from aviation is provided in monthly values for years:2015,2019,2020, 2021, 2022, 2023,2030,2040 and 2050. Well-mixed greenhouse gas emissions are provided for North, South and global average concentration of CO2, CH4 and N2O for all months 2015-2050 Funding was provided by the European Union’s Horizon 2020 Research and Innovation Programme under grant agreement nos. 820829 (CONSTRAIN) http://constrain-eu.org/ Contact Piers Forster (p.m.forster@leeds.ac.uk) for more details. www.climate.leeds.ac.uk Paper reference is Forster, P.M., Forster, H.I., Evans, M.J. et al. Current and future global climate impacts resulting from COVID-19. Nat. Clim. Chang. (2020). https://doi.org/10.1038/s41558-020-0883-0

Version 4 has smoother treatment of oceans, using a global value for locations not overlapping with the coast of a country (coastal locations us the country-specific modifiers). From Version 2, more years are provided via interpolation. The baseline data is also provided for convenience and interpolated onto same years. There is also a bug fix for the aerosol precursor files that affected July 2020-Dec 2021