SciELO - Scientific Electronic Library Online

 
vol.71 número4Manejo de Suelo y Eficiencia de Cepas de Rizobio de Frijol Vigna unguiculata (L.) Walp. en los TrópicosInfluencia del Tiempo de Espera Después de la Inserción de la Base de la Cámara en el Suelo en los Flujos de Gases de Efecto Invernadero Producidos índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Chilean journal of agricultural research

versión On-line ISSN 0718-5839

Resumen

ALVAREZ, José; MITASOVA, Helena  y  ALLEN, H. Lee. Estimating Monthly Solar Radiation in South-Central Chile. Chilean J. Agric. Res. [online]. 2011, vol.71, n.4, pp. 601-609. ISSN 0718-5839.  http://dx.doi.org/10.4067/S0718-58392011000400016.

Solar radiation is a key component in process-based models. The amount of this energy depends on the location, time of the year, and atmospheric conditions. Several equations and models have been developed for different conditions using historical data from weather station networks or satellite measurements. However, solar radiation estimates are too local since they rely on weather stations or have a resolution that is too coarse when working with satellites. In this study, we estimated monthly global solar radiation for the south-central region of Chile using the r.sun model and validated it with observations from automatic weather stations. We analyzed the performance of global radiation results with the Hargreaves-Samani (HS) and Bristow-Campbell (BC) models. Estimates from a calibrated rsun model accounted for 89% of the variance (r2 = 0.89) in monthly mean values for 15 locations in the research area. The model performed very well for a wide area and conditions in Chile when we compared it with the HS and BC models. Our estimates of global solar radiation using the rsun model could be improved through calibration of ground measurements and more precise cloudiness estimates as they become available. With additional procedures, the rsun model could be used to provide spatial estimates of daily, weekly, monthly, and yearly solar radiation.

Palabras clave : Solar radiation; r. sun model.

        · resumen en Español     · texto en Inglés     · pdf en Inglés