During several austral summers covering a 13 year period, we collected a random sample of body feathers from chicks of 11 sympatric species of Procellariiform (wandering albatross Diomedea exulans -79 individuals in total-, black-browed albatross Thalassarche melanophris - 51-, grey-headed albatross T. chrysostoma - 58 -, light-mantled sooty albatross Phoebetria palpebrata - 34 -, northern giant petrel Macronectes halli - 59 -, southern giant petrel M. giganteus - 60 -, white-chinned petrel Procellaria aequinoctialis - 39 -, blue petrel Halobaena caerulea - 19 - , Antarctic prion Pachyptila desolata - 19 -, South Georgian diving petrel Pelecanoides georgicus - 2 - and common diving petrel P. urinatrix - 6 -) to analyse Delta15N and Delta13C.

This dataset comprises the output from a series of eight simulations with the Coupled Magnetosphere-Ionosphere-Thermosphere (CMIT) model as used in the study by Cnossen and Foerster (2016).The first six simulations were run with observed solar radiative forcing, specified by F10.7 values, and observed solar wind conditions. In the last two simulations (dsol-lh and jsol-lh), the solar radiative forcing was artificially reduced by setting the F10.7 values to a constant low value of 80 solar flux units. The dsol-lh and jsol-lh are otherwise identical to the dsol-hh and jsol-mh simulations, respectively. Further details about the simulations and a brief description of the CMIT model are provided by Cnossen and Foerster (2015, in review). Wiltberger et al. (2004) and Wang et al. (2004, 2008) provide further details of the CMIT model. The CMIT simulations were performed on the Yellowstone high-performance computing facility (ark:/85065/d7wd3xhc) provided by the Computational and Information Systems Laboratory of the National Centre for Atmospheric Research, sponsored by the National Science Foundation.