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Nonlinear Processes in Geophysics An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/npg-2017-69
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
29 Nov 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Nonlinear Processes in Geophysics (NPG).
Global teleconnectivity structures of the El Niño-Southern Oscillation and large volcanic eruptions – An evolving network perspective
Tim Kittel1,2, Catrin Ciemer1,2, Nastaran Lotfi3, Thomas Peron3, Francisco Rodrigues3, Jürgen Kurths1,2, and Reik V. Donner1 1Potsdam Institute for Climate Impact Research, Telegrafenberg A31, 14473 Potsdam, Germany
2Department of Physics, Humboldt University Berlin, Newtonstraße 15, 12489 Berlin, Germany
3Institute of Mathematics and Computer Science, University of São Paulo, Avenida Trabalhador Sao-carlense, 400-Centro, 13566-590 Sao Carlos, Brazil
Abstract. Recent work has provided ample evidence that global climate dynamics at time-scales between multiple weeks and several years can be severely affected by the episodic occurrence of both, internal (climatic) and external (non-climatic) perturbations. Here, we aim to improve our understanding on how regional to local disruptions of the “normal” state of the global surface air temperature field affect the corresponding global teleconnectivity structure. Specifically, we present an approach to quantify teleconnectivity based on different characteristics of functional climate network analysis. Subsequently, we apply this framework to study the impacts of different phases of the El Niño–Southern Oscillation (ENSO) as well as the three largest volcanic eruptions since the mid 20th century on the dominating spatio-temporal co-variability patterns of daily surface air temperatures. Our results confirm the existence of global effects of ENSO which result in episodic breakdowns of the hierarchical organization of the global temperature field. This is associated with the emergence of strong teleconnections. At more regional scales, similar effects are found after major volcanic eruptions. Taken together, the resulting time-dependent patterns of network connectivity allow a tracing of the spatial extents of the dominating effects of both types of climate disruptions. We discuss possible links between these observations and general aspects of atmospheric circulation.

Citation: Kittel, T., Ciemer, C., Lotfi, N., Peron, T., Rodrigues, F., Kurths, J., and Donner, R. V.: Global teleconnectivity structures of the El Niño-Southern Oscillation and large volcanic eruptions – An evolving network perspective, Nonlin. Processes Geophys. Discuss., https://doi.org/10.5194/npg-2017-69, in review, 2017.
Tim Kittel et al.
Tim Kittel et al.
Tim Kittel et al.

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