Abstract:

By using the temperature data of the Chongqing and Yichang station(from 1924 to 2011),the variation characteristics of temperature in the Three Georges Reservoir Area during the past 88 years were analyzed.The results demonstrated that the linear trend,decadal variation,sudden change and the cycle analysis showed that the temperature changing characteristics of Chongqing station and Yichang were highly same in the last 88 years,and the two significantly warmer periods were the mid1920s to the 1940s and the mid1990s to the present.The Three Gorges Reservoir area could be represented by the average values of Chongqing and Yichang,and the temperature change in phases of the reservoir area was basically same with Chongqing,Yichang.The significant warming phenomenon appeared since the late 1990s was later than the China average warming stared at the year around 1986.The seasonal temperature changes had some differences,the latest warming of the four seasons mainly concentrated in periods of the mid1990s and later 1990s.There were two sudden changes of the temperature in Three Gorges Reservoir area during the recent 88 years:one was a cooling trend around the year 1947,one was a warming trend around 1996.The 2-4 years cycle changes of the average temperature was the most significant,while the 4 years cycle changes were becoming very significant since the later 1980s.There was a 16-20 years decadal period between the 1920s and the 1980s,but its energy was weaker than the annual period.The Three Gorges Reservoir area temperature changes were different with the global temperature changes during the past 88 years.Compared the latest significant warming time,the temperature change in Three Gorges Reservoir Area was about 10 years behind the global temperature change.〖