摘要
1. The interannual variation of cloud amount was opposite to that of sunshine duration. The correlation coefficient between them in winter was high and negative. The long term trends of the two terms had different types. The SD obviously decreased during 1950—1988; however, the CA did not increase in the same period. The decreasing of SD in company with the slight decrease of CA could be attributed to the declining sensitivity of sunshine recorders owing to the air pollution.2. CA and SD had obvious influence on the daytime temperature and then the daily range of temperature. However, they did not affect the nighttime temperature.3. In southern China, cloud cover plays an important role m the variation of air temperature, but in northern China, perhaps there were some other processes which give more significant influence on the variation of air temperature.
1. The interannual variation of cloud amount was opposite to that of sunshine duration. The correlation coefficient between them in winter was high and negative. The long term trends of the two terms had different types. The SD obviously decreased during 1950—1988; however, the CA did not increase in the same period. The decreasing of SD in company with the slight decrease of CA could be attributed to the declining sensitivity of sunshine recorders owing to the air pollution. 2. CA and SD had obvious influence on the daytime temperature and then the daily range of temperature. However, they did not affect the nighttime temperature. 3. In southern China, cloud cover plays an important role m the variation of air temperature, but in northern China, perhaps there were some other processes which give more significant influence on the variation of air temperature.
