ประนมกร ชูศรี. Estimation of diffuse solar radiation in different wavelength bands using satellite data over Thailand. Doctoral Degree(Physics). Central Library of Silpakorn University. : , 2016.
Estimation of diffuse solar radiation in different wavelength bands using satellite data over Thailand
Abstract:
In this work, models for estimating diffuse solar radiation in different wavelength bands namely, erythemal ultraviolet radiation (0.28-0.40 µm), photosynthetically active radiation (0.40-0.70 µm), near infrared radiation (0.695-0.28 µm) and broadband radiation (0.3-3.0 µm) by using satellite data and atmospheric parameters were developed. The first model is for estimating diffuse erythemal ultraviolet radiation which depends on solar zenith angle, aerosol optical depth and cloud index. The second model is aimed to calculate diffuse photosynthetically active radiation. The model relates diffuse photosynthetically active radiation to satellite-derived earth-atmospheric reflectivity and cosine of solar zenith angle. The next model is focused on generating diffuse near infrared radiation which depends on the earth-atmospheric reflectivity, precipitable water and cosine of solar zenith angle. The last model is for estimating diffuse solar radiation which used clearness index, precipitable water and aerosol optical depth. All models are in reasonable agreement with ground-based measurement with root mean square difference of 12.7%, 12.9%, 16.7% and 12.5% and mean bias difference of -2.8%, -2.2%, and 1.5% and 2.8%, respectively. Afterward, the models were used to determinate diffuse solar radiation in different wavelength bands and the results were displayed as maps. The maps demonstrate diurnal and seasonal variations of the diffuse radiation in Thailand.