Pearson correlations coefficients (r) between δ18Oshell-temperature and local SST data. HadISST is taken from the region 22–24°W, 64–65°N encompassing Faxaflói. Correlations are also reported for linearly detrended data. Significant correlations (p < 0.01) are noted by asterisk, calculated based on r and degrees of freedom (d.f.; number of data pairs used in the comparison minus 1). Correlations were performed with FX3 and FX4 100 m May–Oct station data only for years with at least two FX measurements between May and October.