Variability of the annual amounts of station precipitation revealed by autocorrelation functions and power spectra

Gyu-Ho  Lim; Ae-Sook Suh; Yong-Cheol Suh

doi:10.21701/bolgeomin.129.3.002

Autores/as

Gyu-Ho Lim Seoul National University
Ae-Sook Suh Hydrometeorological Cooperation Center
Yong-Cheol Suh PuKyong National University

DOI:

https://doi.org/10.21701/bolgeomin.129.3.002

Palabras clave:

autocorrelación, lluvia, espectro, precipitación, proceso no lineal, supresión

Resumen

La lluvia en Seúl, comprendiendo tanto “Chugugi” como medidas en pluviómetros modernos, muestra un fuerte pico en la autocorrelación para un paso temporal de 11 años, así como una supresión estadísticamente significativa de la frecuencia correspondiente a 11 años en la función espectral asociada. Se ha confirmado una impronta similar en las medias de las autocorrelaciones y espectros de la precipitación en la Global Historical Climatology Network. Aproximadamente la mitad de las 3065 estaciones seleccionadas mostraron el pico en la autocorrelación, y la supresión del período de 11 años. Para la media global, la supresión en el espectro es pronunciada, y el pico de correlación asociado es menos relevante. Se ha podido simular la supresión de la potencia mediante la modulación de series temporales de ruido blanco que representan precipitación con una serie temporal sinusoidal de una frecuencia dada. Para la modulación se utilizó la multiplicación en lugar de la adición. Un proceso de tipo no lineal parece ser el principal mecanismo en la influencia del ciclo solar de los 11 años en la precipitación.

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