The UKESM1 ARISE experiment explores the impacts of geoengineering via the injection of sulphur dioxide (SO2) into the stratosphere. The injections occur at four different latitudes: 15 degrees N & S and 30 degrees N & S, at an altitude of approximately 20 km. The simulations are based on the medium-emissions CMIP6 scenario ssp245 and cover the years 2035 to 2070. They form a 5-member ensemble with initial conditions taken from the corresponding five members of the ssp245 simulations upon which they were based. Data for the UKESM1 ARISE-SAI-1.5 simulations is available at https://data.ceda.ac.uk/badc/deposited2022/arise and the data for the UKESM1 SSP2-4.5 simulations is available on the Earth System Grid Federation database. The files included here contain processed annual daily extremes of surface temperature (TREFHT) and total precipitation (PRECT) from the ARISE-SAI-1.5 simulations and companion SSP245 simulations. Indices are those recommended by the WCRP Expert Team on Climate Change Detection Indices, Zhang et al. 2011). Methods to calculate the indices are also described in Tye et al. (2022). Precipitation Indices PRCPTOT, SDII, RX1D, RX5D, R10mm, R20mm, CDD, CWD, P95TOT, P99TOT Temperature Indices TNN, TNX, FD, TR, TN90, TN10, TXX, TXN, ID, SU, TX90, TX10

{"references": ["Haywood, J.; Jones, A.; Dalvi, M. (2022): UKESM1 ARISE-SAI climate simulations. NERC EDS Centre for Environmental Data Analysis, 10 May 2023. https://catalogue.ceda.ac.uk/uuid/26b89d8d76bd40bfbaf9fedfa383e9cf", "Tye, M. R., Dagon, K., Molina, M. J., Richter, J. H., Visioni, D., Kravitz, B., & Tilmes, S. (2022). Indices of Extremes: Geographic patterns of change in extremes and associated vegetation impacts under climate intervention. Earth System Dynamics, 13, 1233\u20131257. https://doi.org/10.5194/esd-13-1233-2022", "Zhang, Xuebin et al. (2011) Indices for monitoring changes in extremes based on daily temperature and precipitation data 10.1002/wcc.147"]}

More information can be found here: https://www.cesm.ucar.edu/projects/community-projects/ARISE-SAI/ Computing resources (doi:10.5065/D6RX99HX) were provided by NCAR's Computational and Information Systems Laboratory, sponsored by the National Science Foundation.