Climate Change 2001:
Working Group I: The Scientific Basis
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Figure 8.18: Power spectra of the detrended globally averaged annual mean surface air temperature (SAT) anomaly. The curves represent the estimates obtained from HadCM2 (blue), GFDL_R15_a (green) and ECHAM3/LSG (red). The observed (black line) is from the globally averaged annual mean SAT anomalies compiled by Jones and Briffa (1992). The spectra are smoothed Fourier transforms of the autocovariance function using a Tukey window of 100 lags for the models and 30 lags for the observations. The two vertical lines represent the range of 95% confidence in the spectral estimates for the model and the observations. Taken from Stouffer et al. (2000).

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