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Precursors of the El Niño phenomenon: A climate network analysis
Rupali Sonone1, Neelima Gupte2
1Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.
Abstract:
The identification of precursors of climatic phenomena has enormous practical importance. Recent work constructs a climate network based on surface air temperature data to analyze the El Niño phenomena. We utilize microtransitions which occur before the discontinuous percolation transition in the network as well as other network quantities to identify a set of reliable precursors of El Niño episodes. These precursors identify 10 out of 13 El Niño episodes occurring in the period of 1979-2018 with an average lead time of approximately 6.4 months. We also find indicators of tipping events in the data.
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