Efecto del fenómeno de la Oscilación Cuasi-Bienal en los afluentes del embalse de Betania

Quintero, Luisa Fernanda Yustres; Zarate, Zaida Carolina Riveros; Ivanova, Julia

doi:10.24050/reia.v17i34.1246

Cited by 3 publications

(1 citation statement)

References 3 publications

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“…These periods could be related to the Quasi-Biennial Oscillation (QBO), a climatic alteration located in the Pacific Ocean that consists of zonally symmetrical easterly and westerly wind regimes that regularly alternate with a period that varies between 24 and 30 months and is manifested through hydroclimatological variables such as wind and temperature. Its eastern phases appear to be alternately related to the warm component of ENSO (Riveros et al, 2020). The QBO has already been seen in other records from the Chilean region between 39 and 43 • S (Villalba et al, 1998).…”

Section: Spectral Analysissupporting

confidence: 65%

Nonlinear time series analysis of coastal temperatures and El Niño–Southern Oscillation events in the eastern South Pacific

Rojo-Garibaldi,

Contreras-López,

Giannerini

et al. 2023

Earth Syst. Dynam.

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Abstract. We carry out a nonlinear time series analysis motivated by dynamical systems theory to investigate the links between temperatures on the eastern South Pacific coast, influenced by the Humboldt Current System, and El Niño–Southern Oscillation (ENSO) events. To this aim, we use a set of 16 oceanic and atmospheric temperature time series from Chilean coastal stations distributed between 18 and 45∘ S. The spectral analysis indicates periodicities that can be related to both internal and external forcing, involving not only ENSO, but also the Pacific Decadal Oscillation, the Southern Annual Mode, the Quasi-Biennial Oscillation and the lunar nodal cycle. The asymptotic neural network test for chaos based on the largest global Lyapunov exponent indicates that the temperature dynamics along the Chilean coast is not chaotic. We use local Lyapunov exponents to characterize the short-term stability of the series. Using a cross-entropy test, we find that two stations in northern Chile, one oceanic (Iquique) and one atmospheric (Arica), present a significant positive cross-dependence between local Lyapunov exponents and ENSO. Iquique is the station that presents the greater number of regional characteristics and correlates with ENSO differently from the rest. The unique large-scale study area, combined with time series from hitherto unused sources (Chilean naval records), reveals the nonlinear dynamics of climate variability in Chile.

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Section: Spectral Analysissupporting

confidence: 65%

Nonlinear time series analysis of coastal temperatures and El Niño–Southern Oscillation events in the eastern South Pacific

Rojo-Garibaldi,

Contreras-López,

Giannerini

et al. 2023

Earth Syst. Dynam.

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Effects of 16-weeks of strength training on jump height and anthropometric variables in U19 semi-professional male soccer players

González-Fernández,

Clemente,

Rodríguez-García

et al. 2023

International Journal of Sports Science & Coaching

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Purpose The aim of our study was to examine the effect of 16 weeks of strength training on anthropometric characteristics and jump height in semi-professional male players after a pre-season period. Methods A parallel two-group, longitudinal (pre, post) design was used with physical tests performed before (preintervention) and after (postintervention) the 16-week intervention period. The soccer players were assigned and matched into two groups, an experimental group (EG) and a control group (CG), based on the team of which they were a part. Results A two-way ANOVA was performed with group and time as factors. The results of a two-way ANOVA revealed no time×group interaction for body composition or jump height. Nevertheless, a paired measures t-test of weight, fat mass, lean mass, and countermovement jump (CMJ) test metrics (pre-post) and group (CG and EG) showed an improvement in all measures ( p < 0.01). Discussion The 16-week intervention program resulted in an improvement in the EG both at the level of body composition and in CMJ performance. Conclusions Despite the benefits of the 16-week intervention program, a combination of training methods that includes power, agility-coordination, speed, and strength can enhance such improvements. It is important to take this strength-specific capacity into account in training, due to the importance outlined in the sport of soccer both for its transfer to both linear and COD sprints and specific strength skills and mainly to vertical jump.

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Nonlinear Time Series Analysis of Coastal Temperatures and El Niño–Southern Oscillation Events in the Eastern South Paciﬁc

Rojo-Garibaldi

Contreras-López

Giannerini

et al. 2023

Preprint

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Abstract. We investigate whether there are correlations between temperatures on the Eastern South Paciﬁc coast, inﬂuenced by the Humboldt Current System, and El Niño–Southern Oscillation (ENSO) events, using a set of 16 oceanic and atmospheric temperature time series from Chilean coastal stations distributed between 18° and 45° S. Spectral analysis indicates periodicities that can be related to both internal and external forcing, involving not only ENSO, but also the Paciﬁc Decadal Oscillation, the Southern Annual Mode, the Quasi-Biennial Oscillation and the lunar nodal cycle. We carry out a nonlinear time series analysis. An asymptotic neural network test for chaos based on the largest global Lyapunov exponent indicates that the temperature dynamics along the Chilean coast is not chaotic. We calculate local Lyapunov exponents that characterize the short-term stability of the series. Using a cross entropy test, we ﬁnd that just two stations in northern Chile, one oceanic, Iquique, and one atmospheric, Arica, present a signiﬁcant positive correlation of local Lyapunov exponents with ENSO, with Iquique being the station that displays very particular regional characteristics. This work, having a large-scale study area and using time series from hitherto unused sources (naval records), reveals the nonlinear dynamics of climate variability in Chile.

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Efecto del fenómeno de la Oscilación Cuasi-Bienal en los afluentes del embalse de Betania

Cited by 3 publications

References 3 publications

Nonlinear time series analysis of coastal temperatures and El Niño–Southern Oscillation events in the eastern South Pacific

Nonlinear time series analysis of coastal temperatures and El Niño–Southern Oscillation events in the eastern South Pacific

Effects of 16-weeks of strength training on jump height and anthropometric variables in U19 semi-professional male soccer players

Nonlinear Time Series Analysis of Coastal Temperatures and El Niño–Southern Oscillation Events in the Eastern South Paciﬁc

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