Supplement to: Butler, Paul G; Wanamaker, Alan D; Scourse, James D; Richardson, Christopher A; Reynolds, David J (2013): Variability of marine climate on the North Icelandic Shelf in a 1357-year proxy archive based on growth increments in the bivalve Arctica islandica. Palaeogeography, Palaeoclimatology, Palaeoecology, 373, 141-151, https://doi.org/10.1016/j.palaeo.2012.01.016