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Temporal and spatial variations of global solar radiation over the Qinghai–Tibetan Plateau during the past 40 years

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Abstract

Global solar radiation is of great significance to the balance of ground surface radiation, the energy exchange between the Earth’s surface and atmosphere, and the development of weather and climate systems in various regions. In this study, the monthly global radiation recorded at 23 stations over the Qinghai–Tibetan Plateau (QTP) was utilized to estimate global solar radiation (Q) from sunshine duration and to obtain improved fits to the variation coefficients of the monthly Angström–Prescott model (APM). The modeling results were evaluated by calculating the statistical errors, including mean bias error, mean absolute error, root mean square error, and mean relative error. We demonstrate that the monthly Q values can be predicted accurately by APM over the QTP. We also assess the variations of Q values at 116 meteorological stations by APM over the QTP during 1961–2000. The analysis shows that the annual mean sunshine duration amounted to more than 3,000 h over the whole plateau, implying promising prospects for economic applications of solar energy. During the past 40 years, the mean global solar radiation has been relatively high in the western QTP, extending northward to the Inner Mongolian Plateau. Although its decadal variations in the QTP and surrounding regions were inconsistent, the anomaly values of global solar radiation were generally positive during the 1960s and 1970s, indicating that the QTP’s global solar radiation has increased during those periods. The anomaly values were negative during the 1980s and 1990s, showing that the plateau’s global solar radiation has decreased during those periods. Global solar radiation over the QTP is negatively proportional to latitude but positively proportional to altitude and relative sunshine duration. Three factors, the sunshine duration, latitude, and altitude, exert great influence on global surface radiation, of which sunshine duration is most significant. A high-variation-coefficient zone of global solar radiation occurred in the western part of the QTP but, on average, the variation coefficient of the plateau’s global solar radiation was only 0.031, suggesting that the variation in global radiation was relatively stable over the whole QTP.

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Acknowledgments

The authors sincerely thank Miss Lynn Everett for her help in improving the language of this manuscript. The work is financially supported by the National Natural Sciences Foundation of China (41271081, 41271086, 40901042,40871037, and 40830533), the fund of the State Key Laboratory of Cryospheric Science (SKLCS-ZZ-2010-03), the Hundred Talents Program of the Chinese Academy of Sciences (51Y251571), and the SB2008FY001.

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Authors and Affiliations

  1. Cryosphere Research Station on the Qinghai–Tibetan Plateau, State Key Laboratory of Cryospheric Sciences, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China

    Ren Li, Lin Zhao, Tonghua Wu, Yongjian Ding, Defu Zou, Yao Xiao, Yongliang Jiao, Yanhui Qin & Linchan Sun

  2. Chinese Academy of Meteorological Sciences, Beijing, 100081, China

    Yufei Xin

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  1. Ren Li
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  2. Lin Zhao
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  3. Tonghua Wu
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  9. Yanhui Qin
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Correspondence to Tonghua Wu.

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Li, R., Zhao, L., Wu, T. et al. Temporal and spatial variations of global solar radiation over the Qinghai–Tibetan Plateau during the past 40 years. Theor Appl Climatol 113, 573–583 (2013). https://doi.org/10.1007/s00704-012-0809-5

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