Figure 4: Comparison of short-term variations in hydroclimate between low- and mid-latitudes in the NH.

The residuals of the smoothed YOK-I and SU-96-7 records are shown in the middle of the figure. Events thought to have occurred in both records are highlighted by grey lines. Volcanic sulfate recorded in ice cores from Antarctica and Greenland⁴⁰, as well as solar forcing from¹⁰Be in ice cores⁶⁴, are shown at the top of the figure. Volcanic eruptions tentatively identified in the proxy records are indicated by dashed lines and the eruption name and year. Solar minima recorded with a lag in the proxy records are shown by the grey bars. The color coded plot at the bottom of the figure shows the lagged cross correlation between the YOK-I δ¹³C and SU-96-7 band width records for their common time duration (~900–2000 C.E.). The time evolution of the lagged correlation was obtained using a sliding window of 100 years and allowing for a maximum lead of 60 years to the SU-96-7 record. We find statistically significant correlations between lags of 0–10 years at around 1000, 1300–1400, and 1700–1810 C.E., and lags of 10–20 years during the 1020–1100 C.E. event. Hatched regions in the plot indicate negative correlation values and statistically significant regions of correlation are marked with a thick black boundary.