FIGURE 1. Palaeoclimatic records compared to a climate model simulation.
From the following article:
Climate sensitivity constrained by temperature reconstructions over the past seven centuries
Gabriele C. Hegerl, Thomas J. Crowley, William T. Hyde and David J. Frame
Nature 440, 1029-1032 (20 April 2006)
doi:10.1038/nature04679
'CH-blend' and 'CH-blend (long)' represent 30–90° N annual mean temperature (grey shading shows 10–90% ranges for uncertainty in the amplitude of the reconstruction); ref.11 shows 0–90° N land temperature; ref. 14 shows 30–90° N land temperature; and ref. 12 shows 20–90° N land growing season temperature (dashed line indicates reconstructions rescaled15). The model ('Simulation') has a sensitivity of 2.5 K, mid-range ocean diffusivity and is driven with mid-range aerosol forcing. All data are smoothed to focus on multi-decadal variability and shown as anomalies relative to the period before 1800. The instrumental record for 30–90° N annual mean surface temperature ('Instrumental') is offset to match CH-blend between 1880 and 1960.
