http://www.cnr.it/ontology/cnr/individuo/prodotto/ID45501

On the fluctuation-response relation in Geophysical systems (Articolo in rivista)

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On the fluctuation-response relation in Geophysical systems (Articolo in rivista) (literal)

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G. Lacorata, A. Puglisi and A. Vulpiani (2009)
On the fluctuation-response relation in Geophysical systems
in International journal of modern physics b
(literal)

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Angelo Vulpiani, Dipartimento di Fisica, Università di Roma La Sapienza. (literal)

Titolo

Abstract

One of the major issues concerning the study of a dynamical system is the response to perturbations. In climate dynamics, for example, it is of major interest to understand how a given variable, e.g., the temperature, is sensitive to alterations of some other component of the system, e.g., the greenhouse gas concentration. We review the connection between equilibrium and non-equilibrium properties, also known as Fluctuation-Relaxation Relation, and its main aspects in chaotic and turbulent systems. We consider, in particular, the effects of the fast variables on the slow variables in a multiscale system, as far as the sensitivity properties are concerned. Two examples about (widely speaking) climate modelling are discussed: the Lorenz-96 model and the double-potential well model. Both of them, despite their apparent simplicity, hide the same kind of interesting features of much more complex systems. (literal)

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