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| Figure 5 A comparison of reconstructed solar total radiation (solid blue line) with two curves of Northern Hemisphere (NH) summer temperature (in black) for the period since 1600. The shorter run of temperature shown as a dashed line is taken from direct meteorological measurements that commence in about 1850. The solid black line is a longer and less certain reconstruction of NH temperature, derived primarily from tree-ring data, that has been scaled to match the direct instrumental data during the period of overlap. The temperature curves are in°C, and show departures from an arbitrary mean value. All data have been averaged over ten years. Periods in which different climate forcing mechanisms appear to have predominated are distinguished by shading. |
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