Failure of climate regulation in a geophysiological model

James E. Lovelock, Lee Kump

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

THERE has been much debate about how the Earth responds to changes in climate - specifically, how feedbacks involving the biota change with temperature. There is in particular an urgent need to understand the extent of coupling and feedback between plant growth, global temperature and enhanced atmospheric concentrations of greenhouse gases. Here we present a simple, but we hope qualitatively realistic, analysis of the effects of temperature change on the feedbacks induced by changes in surface distribution of marine algae and land plants. We assume that algae affect climate primarily through their emission of dimethyl sulphide1-8 (which may influence cloud albedo), and that land plants do so by fixation of atmospheric CO(refs 9-12). When we consider how the planetary area occupied by these two ecosystems varies with temperature, we find that a simple model based on these ideas exhibits three feedback regimes. In glacial conditions, both marine and terrestrial ecosystems provide a negative feedback. As the temperature rises to present-day values, algae lose their strong climate influence, but terrestrial ecosystems continue to regulate the climate. But if global mean temperatures rise above about 20°C, both terrestrial and marine ecosystems are in positive feedback, amplifying any further increase of temperature. As the latter conditions have existed in the past, we propose that other climate-regulating mechanisms must operate in this warm regime.

Original languageEnglish (US)
Pages (from-to)732-734
Number of pages3
JournalNature
Volume369
Issue number6483
DOIs
StatePublished - Jan 1 1994

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climate
terrestrial ecosystem
temperature
alga
marine ecosystem
regulation
fixation
albedo
biota
greenhouse gas
ecosystem
land

All Science Journal Classification (ASJC) codes

  • General

Cite this

Lovelock, James E. ; Kump, Lee. / Failure of climate regulation in a geophysiological model. In: Nature. 1994 ; Vol. 369, No. 6483. pp. 732-734.
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Failure of climate regulation in a geophysiological model. / Lovelock, James E.; Kump, Lee.

In: Nature, Vol. 369, No. 6483, 01.01.1994, p. 732-734.

Research output: Contribution to journalArticle

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