Fractality of Monthly Extreme Minimum Temperature

Valdéz-Cepeda, Ricardo David; Hernández-Ramírez, Daniel; Mendoza, B.; Galicia, J. F. Valdés; Maravilla, D.

doi:10.1142/s0218348x0300163x

Cited by 17 publications

(16 citation statements)

References 14 publications

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“…It should be noted, however, that the results of this study coincide with those reported by other researchers for other localities and regions in the sense that downward and upward trends are presented in both types of temperatures. This implies, then, that our results are evidence that there may be local and regional trends that run counter to the global trend, as previously pointed out by Valdez-Cepeda et al (2003a). tados presentados en esta contribución coinciden con lo reportado por otros investigadores para otras localidades y regiones en el sentido de presentar tendencias de decremento e incremento en ambos tipos de temperaturas.…”

Section: Trendssupporting

confidence: 83%

“…En las series de ambas temperaturas, registradas en Guanaceví, se apreció la frecuencia de 20 años, lo cual indica que posiblemente están influidas por el ciclo magnético del Sol (Mendoza et al, 2001;Valdez-Cepeda et al, 2003a).…”

Section: Discussionunclassified

“…Valdez-Cepeda et al (2003a) analyzed the signal spectrum of the series of extreme minimum temperatures from January 1921 to April 1963 recorded in Guanajuato, Mexico (21 0 01'N, 101 0 14'W, 2037 m) and found that β = -2.028 for time scales from two to 254 months; in addition, when the linear trends and annual periodicity were removed, β = -2.09, i.e., the power law remained once these components had been removed.…”

Section: Daymentioning

confidence: 99%

“…tados presentados en esta contribución coinciden con lo reportado por otros investigadores para otras localidades y regiones en el sentido de presentar tendencias de decremento e incremento en ambos tipos de temperaturas. Ello implica, entonces, que nuestros resultados son una evidencia de que puede haber tendencias locales y regionales sin representatividad a nivel global, como previamente fue señalado por Valdez-Cepeda et al (2003a).…”

Section: Trendsunclassified

“…día -1 , aproximadamente medio decenio) puede ajustarse a una ley potencial con un exponente β = -2. Valdez-Cepeda et al (2003a) analizaron el espectro de la señal de la serie de temperaturas mí-nimas extrema, de enero de 1921 a abril de 1963, registrada en Guanajuato, México (21° 01'N, 101° 14'O, 2037 y encontraron que β = -2.028 para escalas de tiempo de dos a 254 meses; además, cuando se eliminaron las tendencias lineal y la periodicidad anual, β = -2.09; es decir, la ley potencial se mantuvo después de que se eliminaron dichos componentes.…”

Section: Introductionunclassified

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La Variación De Las Temperaturas Extremas en La ‘Comarca Lagunera’ Y Cercanías

Inzunza-López¹,

López-Ariza²,

Valdéz-Cepeda³

et al. 2011

Rev Cha Se Cie For y del Amb

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Las series de temperaturas máxima y mínima diarias, con registros de al menos 30 años, de 23 estaciones meteorológicas de la Comarca Lagunera y lugares cercanos, fueron analizadas con las técnicas de regresión lineal simple y densidad de espectro potencial para obtener las tendencias y frecuencias significativas. Las series de 15 de las 23 estaciones presentaron tendencias significati¬vas (P≤0.05) para ambas temperaturas. El promedio de las tendencias de temperatura máxima fue de -0.22 °C por decenio; pues 15 de las 23 series presentaron decrementos, 13 de forma significa¬tiva. El promedio de las tendencias de temperatura mínima fue de -0.085 °C por decenio; ya que 13 de 23 series presentaron tendencias negativas, 11 de forma significativa. La variación a largo plazo fue la predominante ya que los promedios de dimensión fractal fueron 1.46 y de 1.47 para tempe¬ratura máxima y mínima, respectivamente. La mayoría de las series presentaron frecuencias cuasi-bianuales, cuasi-trianuales y cuasi-tetra-anuales. En cinco estaciones se apreciaron frecuencias de 10 a 11 años para ambos tipos de temperatura; una estación presentó la frecuencia de 20 años en las dos temperaturas.

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Section: Trendssupporting

confidence: 83%

Section: Discussionunclassified

Section: Daymentioning

confidence: 99%

Section: Trendsunclassified

Section: Introductionunclassified

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La Variación De Las Temperaturas Extremas en La ‘Comarca Lagunera’ Y Cercanías

Inzunza-López¹,

López-Ariza²,

Valdéz-Cepeda³

et al. 2011

Rev Cha Se Cie For y del Amb

Self Cite

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An investigation on reference crop evapotranspiration trend from 1975 to 2005 in Iran

Kousari¹,

Ahani²

2011

Intl Journal of Climatology

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Evapotranspiration is one of the most important factors in agriculture and the hydrological cycle that can be influenced by global warming and climatic changes. In this study, the trend of reference crop evapotranspiration (ET 0 ) computed by penman Penman-Monteith equation and surveyed in 42 synoptic weather stations during last 3 decades . Nonparametric statistical test, Kendall's rank correlation (or τ test) was used to determine ET 0 trends. Although, downward and upward trends were observed, increasing trends had more frequency. Spatial analysis of results indicated upward trends especially in the boundary parts of the country while, no significant trends were distributed in central parts. In addition, correlation analysis between ET 0 trend and other climatic parameters trend (the trend of mean temperature, mean of minimum temperature, and mean of maximum temperature, mean of relative humidity, mean of wind speed and mean of sunshine duration) showed that wind is the most effective parameter on ET 0 . Iran losses more than 70% of annual precipitation by ET 0 . It is obvious that in this country where there are many limitations for water resources management, increase in ET 0 could lead to more problems.

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The temporal fractality of precipitation in mainland Spain and the Balearic Islands and its relation to other precipitation variability indices

Meseguer-Ruiz

Cantos

Sarricolea

et al. 2016

Intl Journal of Climatology

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Recent years have seen a rise in research into the behaviour of precipitation variability on account of the application of new statistical techniques with a longstanding tradition in other fields. Fractal is a word used to refer to regular objects or processes that cannot be defined by the classical Euclidian mathematics. The fractal dimension of the temporal distribution of precipitation (D) is an indicator of the property of self-similarity in rainfall distribution at different time intervals. While its spatial meaning has previously been developed extensively and is well defined, the interpretation of the concept of fractality applied to the temporal distribution is abstract. The overarching goal of this article is to give climatic significance to this indicator. To this end, data logged at 10-min intervals from 44 weather stations in mainland Spain and the Balearic Islands for the period from 1997 to 2010 has been employed. The D values obtained ranged between 1.4499 for the observatory in Ibiza and 1.6039 for the observatory in Jaca. The fractal dimension presents a significant and good negative correlation (−0.55) with the concentration index (CI), and a significant and good positive correlation (0.67) with entropy. The correlation of D with other traditionally used indices, such as the coefficient of variation or the consecutive disparity index is very limited, as this indicator is more focused on the distribution of precipitation intervals than on the total accumulated rainfall over a given period. In an endeavour to develop multivariate models that explain the behaviour of D, only two-variable models can be obtained, which account for most of the variability and that involve the CI or entropy. Self-similarity is therefore associated with the regular recurrence of precipitation intervals, which is more evident in those observatories with higher D values.

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Fractality of Monthly Extreme Minimum Temperature

Cited by 17 publications

References 14 publications

La Variación De Las Temperaturas Extremas en La ‘Comarca Lagunera’ Y Cercanías

La Variación De Las Temperaturas Extremas en La ‘Comarca Lagunera’ Y Cercanías

An investigation on reference crop evapotranspiration trend from 1975 to 2005 in Iran

The temporal fractality of precipitation in mainland Spain and the Balearic Islands and its relation to other precipitation variability indices

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