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Coupling functions in climate
Stockholm University, Faculty of Science, Department of Mathematics. Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Yale University, USA.
Number of Authors: 22019 (English)In: Philosophical Transactions. Series A: Mathematical, physical, and engineering science, ISSN 1364-503X, E-ISSN 1471-2962, Vol. 377, no 2160, article id 20190006Article in journal (Refereed) Published
Abstract [en]

We examine how coupling functions in the theory of dynamical systems provide a quantitative window into climate dynamics. Previously, we have shown that a one-dimensional periodic non-autonomous stochastic dynamical system can simulate the monthly statistics of surface air temperature data. Here, we expand this approach to two-dimensional dynamical systems to include interactions between two subsystems of the climate. The relevant coupling functions are constructed from the covariance of the data from the two sub-systems. We demonstrate the method on two tropical climate indices, the El-Nino-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD), to interpret the mutual interactions between these two air-sea interaction phenomena in the Pacific and Indian Oceans. The coupling function reveals that the ENSO mainly controls the seasonal variability of the IOD during its mature phase. This demonstrates the plausibility of constructing a network model for the seasonal variability of climate systems based on such coupling functions. This article is part of the theme issue 'Coupling functions: dynamical interaction mechanisms in the physical, biological and social sciences'.

Place, publisher, year, edition, pages
2019. Vol. 377, no 2160, article id 20190006
Keywords [en]
stochastic dynamics, tropical variability, El-Nino-Southern Oscillation, Indian Ocean Dipole
National Category
Mathematics Physical Sciences Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:su:diva-179707DOI: 10.1098/rsta.2019.0006ISI: 000511612600001PubMedID: 31656133OAI: oai:DiVA.org:su-179707DiVA, id: diva2:1411855
Available from: 2020-03-04 Created: 2020-03-04 Last updated: 2020-03-04Bibliographically approved

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Moon, WoosokWettlaufer, John S.
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Department of MathematicsNordic Institute for Theoretical Physics (Nordita)
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MathematicsPhysical SciencesEarth and Related Environmental Sciences

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