Figure 3: Bidecadal variability in Greenland ice core data. | Nature Communications

Figure 3: Bidecadal variability in Greenland ice core data.

From: Bidecadal North Atlantic ocean circulation variability controlled by timing of volcanic eruptions

Figure 3

(a) Principal component time series (with a 5-year running mean) associated with (b) the first EOF of the δ18O data from six annually resolved Greenland ice cores, computed over the period 1000–1973 (see for example, Methods). (c) Wavelet analysis of the time series shown in a but without any filtering. The region significant at the 95% level are marked using bold contours. (d) Power spectrum of the time series in black compared with an AR1 signal shown in red. In a,c, the vertical red bars stand for the onset of the five eruptions selected over the last millennium.

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