The Role of Natural Versus Forced Change in Future Rapid Summer Arctic Ice Loss - Arctic Sea Ice Decline: Observations, Projections, Mechanisms, and Implications - page 140

Figure 3. (a) ensemble mean IPCC-AR4 CCSM3 September ice extent time series, (b) deviation from the ensemble
mean for run 1, and (c) 20-year running standard deviation of the September ice extent anomaly in run 1. In Figure 3a,
the thin line shows the September ice extent time series from run 1.