Dynamic Changes in Sunshine Duration and its Relationship with Atmospheric Circulation in China During 1960-2018
WANG Yao
HUANG Li
SHANG Lijun
LIAO Huamei
XIE Shuishi
GONG Yuhan
ZHONG Keyuan
Abstract：Daily sunshine duration data in 595 meteorological stations from 1960 to 2018 in China was used in this study.We selected three indexes including annual average sunshine duration,days with sunshine duration≥3 h·d-1 and days with sunshine duration≥6 h·d-1 to quantify the change of sunshine duration.Moreover,the changing trend of solar energy resources in China and its relationship with atmospheric circulation were analyzed.The results are as follows:(1)The spatial distribution of sunshine duration is uneven in China,and the sunshine duration is high in Qinghai-Tibet,Northwest and North China.The Cold Lake in Qinghai is the region with the longest average sunshine duration and the most days with sunshine duration≥6 h·d-1 in China.The Sichuan Basin is the region with the least annual average sunshine duration and days with sunshine duration≥3 h·d-1 and days with sunshine duration≥6 h·d-1.The annual average sunshine duration,days with sunshine duration≥3 h·d-1 and days with sunshine duration≥6 h·d-1 increase from the lowest Sichuan Basin to the higher latitude and higher altitude areas.(2)Annual average sunshine duration,days with sunshine duration≥3 h·d-1 and days with sunshine duration≥6 h·d-1 all show significant decreasing trends in China from 1960 to 2018(P<0.001).The annual sunshine duration in Northeast China,North China,South China and the central region of Xinjiang showed a significantly downward trend.However,it exhibited an increasing trend in Qinghai-Tibet Plateau,Loess Plateau and Yunnan-Kweichow Plateau.(3)The change of sunshine duration was significantly affected by atmospheric circulation.Interannual variation of sunshine duration was significantly and positively correlated with the intensity index of a polar vortex in Asia(P<0.001),and significantly and negatively correlated with the Arctic Oscillation index and the intensity index of a subtropical high in the western Pacific.The atmospheric circulation in eastern China mainly affects the change of sunshine duration by affecting the weather.These research results can provide important references for rational development and utilization of regional solar energy resources and prediction of sunshine duration change.
Keywords：sunshine durationsolar energysunshine intensityatmospheric circulationcorrelation analysisvariation trend
Publication Date：2024-02-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 146-155 )