TY - JOUR
T1 - Calibration of solar radiation models for Europe using Meteosat Second Generation and weather station data
AU - Bojanowski, Jedrzej S.
AU - Vrieling, Anton
AU - Skidmore, Andrew K.
PY - 2013
Y1 - 2013
N2 - Solar radiation is a key input variable for crop growth models. However, direct measurement of solar radiation is performed operationally for only a limited number of weather stations. Instead of direct measurements, empirical solar radiation models are used that link solar radiation to more commonly measured meteorological variables. Coefficients for these models are site-dependent and therefore generally interpolated from the few locations where solar radiation is measured. In this study, three solar radiation models were calibrated (Ångström–Prescott, Supit–Van Kappel, and Hargreaves) using a daily solar radiation product derived from Meteosat Second Generation data. This satellite-based calibration of model coefficients led to a higher accuracy when estimating daily solar radiation, as compared to the use of interpolated ground-based model coefficients. The average relative root mean square error for Meteosat Second Generation-based calibrated models was 1.9% lower for the Supit–Van Kappel model (p < 0.001, n = 137), and 1.8% lower for the Hargreaves model (p < 0.001, n = 222). There was no significant improvement using the Ångström–Prescott model. The Meteosat Second Generation-based model coefficients were interpolated to create continuous coefficient maps for Europe. From these maps it is possible to estimate solar radiation from the sunshine duration, cloud coverage and air temperature range for every location in Europe without prior calibration. We conclude that Meteosat Second Generation-based calibration of model coefficients improves the accuracy of solar radiation estimates.
AB - Solar radiation is a key input variable for crop growth models. However, direct measurement of solar radiation is performed operationally for only a limited number of weather stations. Instead of direct measurements, empirical solar radiation models are used that link solar radiation to more commonly measured meteorological variables. Coefficients for these models are site-dependent and therefore generally interpolated from the few locations where solar radiation is measured. In this study, three solar radiation models were calibrated (Ångström–Prescott, Supit–Van Kappel, and Hargreaves) using a daily solar radiation product derived from Meteosat Second Generation data. This satellite-based calibration of model coefficients led to a higher accuracy when estimating daily solar radiation, as compared to the use of interpolated ground-based model coefficients. The average relative root mean square error for Meteosat Second Generation-based calibrated models was 1.9% lower for the Supit–Van Kappel model (p < 0.001, n = 137), and 1.8% lower for the Hargreaves model (p < 0.001, n = 222). There was no significant improvement using the Ångström–Prescott model. The Meteosat Second Generation-based model coefficients were interpolated to create continuous coefficient maps for Europe. From these maps it is possible to estimate solar radiation from the sunshine duration, cloud coverage and air temperature range for every location in Europe without prior calibration. We conclude that Meteosat Second Generation-based calibration of model coefficients improves the accuracy of solar radiation estimates.
KW - METIS-295604
KW - ITC-ISI-JOURNAL-ARTICLE
UR - https://ezproxy2.utwente.nl/login?url=http://dx.doi.org/10.1016/j.agrformet.2013.03.005
UR - https://ezproxy2.utwente.nl/login?url=https://webapps.itc.utwente.nl/library/2013/isi/vrieling_cal.pdf
U2 - 10.1016/j.agrformet.2013.03.005
DO - 10.1016/j.agrformet.2013.03.005
M3 - Article
SN - 0168-1923
VL - 176
SP - 1
EP - 9
JO - Agricultural and forest meteorology
JF - Agricultural and forest meteorology
ER -