Journal of Taiwan Agricultural Research

Author:Ming-Hwi Yao*, Shun Chen, Kuang-Shth Chi and Jin-Chuan Tsai

Abstract:

    Solar radiation is an important input parameter for crop simulation model. Because the sensor of solar radiation is expensive, to measure solar radiation are not popular as air temperature. Therefore, the objective for this study is to develop the algorithms for calculating solar radiation from daily maximum and minimum temperature. With a 10-year data set from weather station of Taiwan Agricultural Research Institute, we found the rainfall condition highly effect the estimation of solar radiation based on daily temperature, especially during the high rain-month period (June to October). A newly combined formula that included the temperature and rainfall could provide the estimation with less error than single factor. This study evaluated the accuracy for using daily temperature to estimate daily solar radiation at 6 weather stations in Taiwan area, the root mean square error (RMSE) range between calculated values from developed model and measured data in 1995 was 1.02-6.08 MJ m^-2 day^-1 with a standard deviation of 2.33 MJ m^-2 day^-1.

Key words:Solar radiation, Solar radiation ratio, Root mean square error (RMSE), Mean bias error (MBE)

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