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Were Rivers Flowing across the Sahara During the Last Interglacial? Implications for Human Migration through Africa

Figure 8

Comparison between observed and ESM simulated rainfall for pre-industrial scenario.

Comparison between observed rainfall (maps on left) and pre-industrial ESM (maps on right). ESM cells overlaying the upper Nile catchment were selected and mean monthly totals were calculated for a 50 year time series. Mean monthly totals for observed rainfall cells were calculated for cells of the catchment from the time period 1901–1920. To resolve differences in spatial resolution between both datasets, (Figure 5a,b), the centroids of observed and ESM data were chosen to interpolate mean monthly rainfall using a spline technique, at 10,000 m resolution.

Figure 8