Change trend of temperature and precipitation in Neijiang in recent 40 years
Temperature and precipitation are the main factors which affect the climate directly.By using methods of Fitting of a second degree parabola and Rescaled range analysis(R/S),the change characteristics of the annual average temperature and the annual precipitation in Neijiang city,which is located in the Central Hilly Re-gion of Sichuan Basin,were analyzed.The results showed that changes of the temperature and annual precipita-tion were not in the same trend entirely in recent 40 years.The temperature decreased firstly and then increased afterwards,while the Hurst index was 0.4024,which indicated that there might exist the Hurst phenomenon in the future.Although the annual precipitation presented a declining trend in recent 40 years,but the Hurst index of the precipitation was 0.3393,which meant that the annual precipitation in the future would be likely to ascend.