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| Evaluation on applicability of global solar radiation calculation model in Northwest China |
| ZHANG Yixuan1, CUI Ningbo1,2*, FENG Yu1,3, YUE Jinhua4, WANG Jun4, LIU Shuangmei5 |
| 1. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, Sichuan 610065, China; 2. Provincial Key Laboratory of Water-Saving Agriculture in Hill Area of Southern China, Chengdu, Sichuan 610066, China; 3. State Engineering Laboratory for Efficient Water Use and Disaster Loss Reduction of Crops, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agriculture Sciences, Beijing 100081, China; 4. Beijing Zhongnong Xingwang Planning and Design Consultion Co.Ltd., Beijing 100102, China; 5. Sichuan Institute of Water Resources Science, Chengdu, Sichuan 610065, China |
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Abstract To effectively improve the prediction accuracy of Rs in Northwest China, the daily climate data collected from 11 representive meteorological stations during 1959—2015 were used to estimate Rs. Four kinds of sunshine-based models(Angstrom-Prescott, Ogelman, Bahel and Louche model)and two kinds of temperature-based models(Hargreaves and Bristow-Campbell model)were evaluated in four sub-zones: the temperate continental high temperature-arid zone, the temperate continental arid zone, the plateau continental semiarid zone and the temperate monsoon semiarid zone. The results show that the estimate Rs results of each model has a significant correlation with the measured value at the 0.001 level. Generally, the applicability of sunshine-based model(with R2 ranging from 0.901 to 0.903)is better than that of temperature-based model(with R2 ranging from 0.695 to 0.719). Among the 4 sunshine-based models, Bahel model shows the best performance, with R2 of 0.903, MAE of 1.624 MJ/(m2·d), MRE of 15.7%, RMSE of 2.298 MJ/(m2·d)and NSE of 0.902. The most accurate temperature-based model is Bristow-Campbell model, with R2 of 0.719, MAE of 2.851 MJ/(m2·d), MRE of 30.7%, RMSE of 3.959 MJ/(m2·d)and NSE of 0.713. Overall, the Bahel model is recommended to estimate daily and monthly Rs when only the sunshine duration data are avai-lable in Northwest China and the Bristow-Campbell model is recommended to estimate Rs when only temperature data are available.
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Received: 16 October 2018
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