Figure 9.26: Standard deviations
of Niño-3 SST anomalies (Unit: °C) as a function of time during transient
greenhouse warming simulations (black line) from 1860 to 2100 and for the same
period of the control run (green line). Minimum and maximum standard deviations
derived from the control run are denoted by the dashed green lines. A low-pass
filter in the form of a sliding window of 10 years width was used to compute the
standard deviations. (a) ECHAM4/OPYC model. Also shown is the time evolution of
the standard deviation of the observed from 1860 to 1990 (red line). Both the
simulated and observed SST anomalies exhibit trends towards stronger interannual
variability, with pronounced inter-decadal variability superimposed, (reproduced
from Timmermann et al., 1999), (b) HadCM3 (Collins, 2000b).
