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Using GENIE to study a tipping point in the climate system

Record type: Article

We have used the Grid ENabled Integrated Earth system modelling framework to study the archetypal example of a tipping point in the climate system; a threshold for the collapse of the Atlantic thermohaline circulation (THC). eScience has been invaluable in this work and we explain how we have made it work for us. Two stable states of the THC have been found to coexist, under the same boundary conditions, in a hierarchy of models. The climate forcing required to collapse the THC and the reversibility or irreversibility of such a collapse depends on uncertain model parameters. Automated methods have been used to assimilate observational data to constrain the pertinent parameters. Anthropogenic climate forcing leads to a robust weakening of the THC and increases the probability of crossing a THC tipping point, but some ensemble members collapse readily, whereas others are extremely resistant. Hence, we test general methods that have been developed to directly diagnose, from time-series data, the proximity of a ‘tipping element’, such as the THC to a bifurcation point. In a three-dimensional ocean–atmosphere model exhibiting THC hysteresis, despite high variability in the THC driven by the dynamical atmosphere, some early warning of an approaching tipping point appears possible.

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Citation

Lenton, Timothy M., Myerscough, Richard J., Marsh, Robert, Livina, Valerie N., Price, Andrew R. and Cox, Simon J. (2009) Using GENIE to study a tipping point in the climate system Philosophical Transactions: Mathematical, Physical and Engineering Sciences, 367, (1890), pp. 871-884. (doi:10.1098/rsta.2008.0171).

More information

Published date: 13 March 2009
Keywords: escience, earth system modelling, climate change, atlantic thermohaline circulation, tipping point, early warning
Organisations: Ocean and Earth Science, Engineering Sciences

Identifiers

Local EPrints ID: 65084
URI: http://eprints.soton.ac.uk/id/eprint/65084
ISSN: 1364-503X
PURE UUID: a93830b5-2494-4610-8b75-1ace52415682

Catalogue record

Date deposited: 29 Jan 2009
Last modified: 17 Jul 2017 14:10

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Contributors

Author: Timothy M. Lenton
Author: Richard J. Myerscough
Author: Robert Marsh
Author: Valerie N. Livina
Author: Andrew R. Price
Author: Simon J. Cox

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