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Title: Improving graph-based detection of singular events for photochemical smog agents
Authors: Carmona-Cabezas, Rafael
Gomez-Gomez, Javier
Gutierres de Rav, Eduardo
Sanchez-Lopez, Elena
Serrano, João
Jimenez-Hornero, Francisco J.
Keywords: Photochemical smog
Visibility graphs
Singularity detection
Issue Date: Apr-2020
Publisher: Elsevier
Citation: Carmona-Cabezas, R., Gomez-Gomez, J., Gutierrez de Rav, E. Sanchez-Lopez, E., Serrano, J.,Jimenez-Hornero, F.J. (2020). Improving graph-based detection of singular events from photochemical smog agents. Chemosphere, 253, 126660. (DOI: 10.1016/j.chemosphere.2020.126660)
Abstract: Recently, a set of graph-based tools have been introduced for the identification of singular events of O3, NO2 and temperature time series, as well as description of their dynamics. These are based on the use of the Visibility Graphs (VG). In this work, an improvement of the original approach is proposed, being called Upside-Down Visibility Graph (UDVG). It adds the possibility of investigating the singular lowest episodes, instead of the highest. Results confirm the applicability of the new method for describing the multifractal nature of the underlying O3, NO2, and temperature. Asymmetries in the NO2 degree distribution are observed, possibly due to the interaction with different chemicals. Furthermore, a comparison of VG and UDVG has been performed and the outcomes show that they describe opposite subsets of the time series (low and high values) as expected. The combination of the results from the two networks is proposed and evaluated, with the aim of obtaining all the information at once. It turns out to be a more complete tool for singularity detection in photochemical time series, which could be a valuable asset for future research.
Type: article
Appears in Collections:ERU - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
MED - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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