Daisy world

Model : daisyworld1
Simile version : 3.1+
Date added : 2003-06-20
Keywords : Daisy world ; Basic System Dynamics ;

Description

This is an implementation of James Lovelock’s DaiyWorld model. This aims to show that even a very simple, artificial system is capable of regulating conditions to suit itself.

We consider a planet on which can grow black amd white daisies. Black daisies heat up the air around them; white daisies cool it down. The proportion of black and white changes as solar output increases, resulting in a reasonably uniform value for global planet temperature.

The original model is run with solar output increasing gradually over time. For each setting of solar output, the model is run until an equilibrium of black and white daisies is reached. This Simile version simulates the latter process: i.e. the dynamics of the daisy populations. To reproduce the analysis performed with the original model, you can simply change the value for solar output and run the model again, recording the final value of global temperature.

Files

Model file Click on the icon to download the model file. (You will need Simile to examine and run the model. A free evaluation version is available from the products page.) Some browsers may attempt to display the model file, rather than open it in Simile; in this case, use the browser back button to return to this page, and use the context menu (invoked by right-clicking on the link) to save the target file to disk.

daisyworld1.sml

Diagram

Equations

View the model equations.

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