Figure 3. a) Spatial structure of the 3 dominant EOFs from the long period time series. b), c) and d) Temporal variation of EOF modes 1 (blue), 2 (red) and 3 (green), showing the portion of the variability explained by each mode. In c), the North Atlantic Oscillation (NAO) index, divided by 10, is shown in black. In d), the Atlantic Multi-decadal Oscillation (AMO), divided by 2, is shown in black. e) Exhibits the spectral amplitudes of the temporal variations of the 3 EOF modes. f) and g) display coherence between each one of the 3 EOF modes (color coding for each mode is consistent with other panels) and NAO (f) and AMO (g). The horizontal dashed lines indicate significance levels at 90, 95 and 99%.
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