Study on the Trend and Influencing Factors of Solar Radiation in Jiangxi Province Over Recent 40 years
Based on the daily meteorological data of 20 national stations in Jiangxi province from 1980 to 2019,the long-term variation trend of solar radiation in Jiangxi province and the relation-ship between solar radiation and aerosol optical depth,water vapor content in the whole atmosphere,low cloud cover and total cloud cover were analyzed by Mann-Kendall trend test and Pearson corre-lation analysis.The results show that:1)In the past 43 years,the aerosol optical depth and atmos-pheric water vapor content of the whole layer has significant growth impact,and the annual average value of solar radiation in Jiangxi province decreased at a rate of-5.7×10-3 MJ m-2decade-1,the slight variation of total cloud cover and low cloud cover has limited influence on the solar radiation variation.2)The average solar radiation in summer,autumn and winter decreased at a rate of-24×10-3 MJ m-2decade-1,-2.4×10-3 MJ m-2decade-1,-2.8×10-3 MJ m-2 decade-1,while the av-erage solar radiation in spring increased at a rate of 11.5×10-3 MJ m-2 decade-1,and the decrease of solar radiation in summer is affected by the aerosol optical depth and low cloud cover;The fall of solar radiation in autumn is affected by the aerosol optical depth significantly increases the influ-ence,and the decrease of solar radiation in winter is also mainly affected by the aerosol optical depth.The increase of solar radiation in spring mainly depends on the significant decrease of total cloud cover.3)The increase of aerosol optical depth and water vapor content in the whole atmos-phere leads to the decrease of solar radiation at 80%of the stations,and the decrease of total cloud amount and low cloud amount leads to the increase of solar radiation at 20%of the stations.The rea-son why the solar radiation at Xiushui station and Ganzhou station has the same trend as the four in-fluencing factors needs further research.
Jiangxi provincesolar radiationaerosol optical depthwater vapor content in the whole atmospheretotal cloud coverlow cloud cover
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