Analysis of sky conditions using 40 year records of solar radiation data in China |
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| Authors: | H Z Che G Y Shi X Y Zhang J Q Zhao Y Li |
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| Institution: | (1) Key Laboratory of Atmospheric Chemistry, Center for Atmospheric Watch and Services, Chinese Academy of Meteorological Sciences, CMA, Beijing, China;(2) State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China;(3) State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China |
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| Abstract: | Summary Forty years of daily global and diffuse radiation data have been used to characterize the atmospheric optical conditions at
14 premium radiation stations in China. The clearness index (K
T
), diffuse ratio (K
D
), and diffuse coefficient (K
C
) have been analyzed for long-term and seasonal variations, correlations of relative sunshine (R
S
) versus clearness index and diffuse coefficient, respectively. Two polynomial models have been developed to simulate clearness
index and diffuse ratio by using relative sunshine data and have been shown to be reasonable at most of the 14 stations. The
results show that there are significant declining trends in clearness index and increasing trends in diffuse ratio at most
of the 14 premium radiation stations, but there are no significant trends for diffuse coefficient. The seasonal variations
of clearness index are determined by the regional climate and changes with relative sunshine. |
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| Keywords: | |
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