Time and Space Variability of Rainfall in Central-East Argentina
Open Access
- 1 January 1989
- journal article
- research article
- Published by American Meteorological Society in Journal of Climate
- Vol. 2 (1) , 39-47
- https://doi.org/10.1175/1520-0442(1989)002<0039:tasvor>2.0.co;2
Abstract
Climatic variability of monthly rainfall data over a period of 30 yr is analyzed. Twenty-three precipitation locations of the central pampa region of Argentina were used. They are spread over the transition zone between wet and dry pampa. The variance contribution for three frequency bands were emphasized using spectral analysis. They include interannual, annual and intraannual variability. Temporal variability for high frequency (that of periods up to 5 months) accounts for 60% of the total variance. Space variability for monthly, three-month, seasonal, and annual periods are analyzed by empirical orthogonal functions. An axis of maximum mean monthly rainfall variability is found oriented from Sierra de la Ventana towards the NE. Spectral contributions for the monthly temporal coefficients of the first two eigenvalues show main peaks with 12-, 6- and 7-month periods.This publication has 0 references indexed in Scilit: