The evolution of a non-autonomous chaotic system under non-periodic forcing: a climate change example

de Melo Virissimo, Francisco, Stainforth, David A. ORCID: 0000-0001-6476-733X and Bröcker, Jochen (2024) The evolution of a non-autonomous chaotic system under non-periodic forcing: a climate change example. Chaos, 34 (1). ISSN 1054-1500

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Abstract

In this article, we approach the problem of measuring and interpreting the mid-term climate of a non-autonomous chaotic dynamical system in the context of climate modeling. To do so, we use a low-dimensional, conceptual model for the Earth system with different timescales of variability and subjected to non-periodic external forcing. We introduce the concepts of an evolution set and its distribution, which are dependent on the starting state of the system, and explore their links to different types of initial condition uncertainty and the rate of external forcing. We define the convergence time as the time that it takes for the evolution distribution of one of the dependent variables to lose memory of its initial condition. We suspect a connection between convergence times and the classical concept of mixing times, but the precise nature of this connection needs to be explored. These results have implications for the design of influential climate and Earth system model ensembles and raise a number of issues of mathematical interest.

Item Type:	Article
Official URL:	https://pubs.aip.org/aip/cha
Additional Information:	© 2024 The Author(s)
Divisions:	Grantham Research Institute
Subjects:	G Geography. Anthropology. Recreation > GE Environmental Sciences Q Science > Q Science (General)
Date Deposited:	26 Jan 2024 14:21
Last Modified:	05 Mar 2024 14:00
URI:	http://eprints.lse.ac.uk/id/eprint/121591

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