This is the JULES output data that are analysed and presented in the paper entitled "JULES-CN: a coupled terrestrial Carbon-Nitrogen Scheme (JULES vn5.1)" by Wiltshire et al., 2021, DOI: https://doi.org/10.5194/gmd-2020-205. The data are annual mean model output data for vn5.1 of JULES. The filenames are in the format CONFIGURATION.NAME.YEAR.nc CONFIGURATION is one of: vn5.1_loff_noff_GMD - this is using the carbon cycle only configuration of JULES, i.e. the JULES-C configuration vn5.1_loff_non_GMD - this is using the carbon and nitrogen configuration of JULES, i.e. the JULES-CN configuration vn5.1_lon_non_GMD - this is using the carbon and nitrogen configuration of JULES with layered soil biogeochemistry, i.e. the JULES-CNlayered configuration. NAME is one of: S2.C_N_Annual - mainly carbon and nitrogen variables S2.Annual - mainly physical variables YEAR is one of: year between 1860 and 2009

This work was also supported by the Joint UK BEIS/Defra Met Office Hadley Centre Climate Programme (GA01101).