Fertile Area is the exogenously given fraction of the planet surface that is
habitable by daisies. Similarly, the area occupied by daisies is
DAISY AREA ¼ LIGHT DAISY AREA þ DARK DAISY AREA
ð44:6Þ
and the area not occupied by daisies is
GROUND AREA ¼ 1 À DARK DAISY AREA À LIGHT DAISY AREA
ð44:7Þ
The daisies are also subject to death at the rate of 30 % of the population per
unit time.
The most crucial aspect of the Daisyworld model lies in the calculation of the
temperature of the world. The modules of Figs. 44.2 and 44.3 are devoted to this
calculation. The first of these modules (Fig. 44.2) calculates world temperature.
Physically, the planet surface temperature is determined by the amount of solar
radiation incident upon the planet and the amount reflected by the planet. Using the
Stefan-Boltzmann rule, WORLD TEMP is given by
Fig. 44.2
Fig. 44.3
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44 Daisyworld
habitable by daisies. Similarly, the area occupied by daisies is
DAISY AREA ¼ LIGHT DAISY AREA þ DARK DAISY AREA
ð44:6Þ
and the area not occupied by daisies is
GROUND AREA ¼ 1 À DARK DAISY AREA À LIGHT DAISY AREA
ð44:7Þ
The daisies are also subject to death at the rate of 30 % of the population per
unit time.
The most crucial aspect of the Daisyworld model lies in the calculation of the
temperature of the world. The modules of Figs. 44.2 and 44.3 are devoted to this
calculation. The first of these modules (Fig. 44.2) calculates world temperature.
Physically, the planet surface temperature is determined by the amount of solar
radiation incident upon the planet and the amount reflected by the planet. Using the
Stefan-Boltzmann rule, WORLD TEMP is given by
Fig. 44.2
Fig. 44.3
414
44 Daisyworld