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Scientists Debate GaiaThe Next Century$
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Stephen H. Schneider, James R. Miller, Eileen Crist, and Penelope J. Boston

Print publication date: 2004

Print ISBN-13: 9780262194983

Published to MIT Press Scholarship Online: August 2013

DOI: 10.7551/mitpress/9780262194983.001.0001

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Salvaging the Daisyworld Parable under the Dynamic Area Fraction Framework

Salvaging the Daisyworld Parable under the Dynamic Area Fraction Framework

(p.241) 21 Salvaging the Daisyworld Parable under the Dynamic Area Fraction Framework
Scientists Debate Gaia

K. M. Nordstrom

V. K. Gupta

T. N. Chase

The MIT Press

This chapter constructs a new version of the Daisyworld model based on local heat balances, using the simple heat transport parameterization of Budyko. This Dynamic Area Fraction model (DAFM) formulation removes the assumption of perfect local homeostasis through the albedo-dependent local heat transfer equation. From this DAFM formulation the Daisyworld heat transport parameter is interpreted physically, thus removing the artificiality in its parameter set. This representation results in globally similar temperature regulation, despite the removal of the assumption of perfect local homeostasis. These results are surprising, and lend weight to the Daisyworld parable. The regulation of local temperatures, or “homeostasis,” is proscribed by the biota independently of solar forcing. In addition, the strength of the model’s homeostatic behavior, its main result, is forced to depend on an arbitrary parameter associated with the heat transport.

Keywords:   local heat balances, Daisyworld model, heat transport parameterization, Budyko, Dynamic Area Fraction model, DAFM, perfect local homeostasis

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