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Long-term trends in downwelling solar irradiance and associated climaticfactors over China are studied in the paper. Decreasing trends in global anddirect radiation are observed over much of China. The largest decreaseoccurs in South and East China (east of about 100° E and south of about40° N). The spatial pattern of observed trends in diffuse irradiance iscomplex and inhomogeneous. An intriguing aspect of trends in global anddirect irradiance is the rather abrupt decrease in annual and seasonal meanvalues from 1978 onward. The decreasing trends in solar radiation in China didnot persist into the 1990s. The spatial and temporal patterns of trends insunshine duration are consistent with that of global and direct irradiance.A decreasing trend in rainy days is observed over much of China, which is inagreement with the secular trend in cloud amount. The fact that trends incloud amount and solar radiation are quite similar suggests that the cloud amount isnot the primary cause for the decrease in solar radiation. Visibility in the easternpart of China has deteriorated heavily as a result of the rapid increase in aerosolloading. The statistical analysis showed that atmospheric transmission underclear conditions decreased rapidly. These facts suggest that the rapidincrease in aerosol loading should be one of the principle causes for thedecrease in solar radiation. The observed diurnal temperature rangedecreases remarkably in China, which is closely related to the increase inaerosols. The effects of anthropogenic air pollutants on climate should befurther studied and included in the simulation of climate and projection ofclimate scenario.  <b>Keywords.</b> Atmospheric composition and structure(Aerosol and particles; General or miscellaneous) – Meteorologyand atmospheric dynamics (Radiative processes

Long-term trends in solar radiation and the associated climatic factors over China for 1961-2000