There is a wide range of albedo values, as shown in Table 2.3. Surface values inferred from satellite measurements range from 0.08-0.20 for parts of Tasmania (Figure 2.14). The albedo of the sea is affected by cloudiness, wave size, and the angle of the Sun above the horizon. It is about 38 per cent when the Sun's angle is 10° in a clear sky, but only 4 per cent when the Sun is overhead. (The exact value depends on the smoothness of the water surface.) For an overcast sky, these figures change to 13 per cent and 6 per cent, respectively. The figures for the case of the Sun overhead are the important ones because insolation is then at its greatest, and so
Table 2.3 Typical values of the albedo of various surfaces
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