Reconstructed main atmospheric circulation modes during winter in the North Atlantic region covering 1241-1970 CE, based on Greenland ice cores and an isotope enabled climate model simulation

This dataset contains the time series (1241-1970 CE) of the first two principal components (PCs) of reconstructed winter (DJF) Sea Level Pressure (SLP) in the North Atlantic region (20-70N, 90W-40E). The SLP is reconstructed by matching modeled d18O patterns from an isotope enabled climate model simulation to the spatio-temporal variability of the winter d18O from Greenland ice cores, and extracting the model SLP from an ensemble of the best matching years. PC1 of reconstructed SLP corresponds to the North Atlantic Oscillation, and PC2 of reconstructed SLP corresponds to the Eastern Atlantic pattern. Both time series are normalized and centred. The sign of the data series is as shown in Figure 2 of Sjolte et al. (2018) with the corresponding spatial patterns shown in Supplementary Figure S3. For example, positive values of PC1 means positive NAO, while positive values of PC2 means negative pressure anomalies south of Greenland.