Stable oxygen isotope data of sediment cores PS1878, PS1243, JM11-FI-19PC and MD99-2284

As the base for the chronological framework of the records, we used core MD99-2284 as this record exhibits the highest temporal resolution and has a robust chronology established by aligning variations in downcore sea-surface temperatures with synchronous changes in the hydroclimate record from southern Sweden (Muschitiello et al., 2020) in the interval between 10 ka and 14.8 ka.

For the older part of the records, we use the chronology of core JM11-FI-19PC which was previously aligned with the North Greenland Ice Core Project (NGRIP) ice core based on tephras, δ18O, magnetic susceptibility, and K/Ti records (Ezat et al., 2014, 2017). To align the chronologies of the presented cores, we used their published planktic δ18O records based on Neogloboquadrina pachyderma (Bakke et al., 2009; Bauch et al., 2001; Ezat et al., 2016; Hoff et al., 2016; Telesiński et al., 2014).