Fig. 6: Probability density function of NAO.
From: More positive and less variable North Atlantic Oscillation at high CO2 forcing
Multi-model (a) winter and (b) summer NAO for piControl (blue) and 4 × CO2 (red). The NAO index is standardized (mean is subtracted and divided by the standard deviation) and then the average is taken from all the 4 × CO2 experiments from the 55 models.
