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An Improved ångström-type model for estimating solar radiation over the tibetan plateau

Journal article
Authors Jiandong Liu
Tao Pan
Deliang Chen
Xiuji Zhou
Qiang Yu
Gerald N. Flerchinger
De Li Liu
Xintong Zou
Hans W. Linderholm
Jun Du
Dingrong Wu
Yanbo Shen
Published in Energies
Volume 10
Issue 7
Publication year 2017
Published at Department of Earth Sciences
Language en
Keywords Improved Ångström-type model, Solar radiation estimation, Tibetan Plateau
Subject categories Meteorology and Atmospheric Sciences, Climate Research


© 2017 by the authors. For estimating the annual mean of daily solar irradiation in plateau mountainous regions, observed data from 15 radiation stations were used to validate different empirical estimation methods over the Tibetan Plateau. Calibration indicates that sunshine-based site-dependent models perform better than temperature-based ones. Then, the highly rated sunshine-based Ångström model and temperature-based Bristow model were selected for regional application. The geographical models perform much better than the average models, but still not ideally. To achieve better performance, the Ångström-type model was improved using altitude and water vapor pressure as the leading factors. The improved model can accurately predict the coefficients at all the stations, and performs the best among all models with an average Nash-Sutcliffe Efficiency value of 0.856. Spatial distribution of the annual mean of daily solar irradiation was then estimated with the improved model. It is indicated that there is an increasing trend of radiation from east to west, with a great center of the annual mean of daily solar irradiation on southwest Tibetan Plateau ranging from 20 to 24 MJm2. The improved model should be further validated against observations before its applications in other plateau mountainous regions.

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