Abstract:

Based on daily temperature data of 30 stations in or around the Three Gorges Area during 1961-2010,the dynamic temporal and spatial variation characteristics of high temperature were analyzed by mathematical statistical methods.The results showed that the mean annual high temperature days were 2407 days,oscillating with a cycle of about 23 or 31 years,the abrupt change from many to few in 1979,and the mean daily highest temperature during annual high temperature days was 3669℃, oscillating with a cycle of about 3 years in the past 50 years.The frequency and intensity of high temperature in August was the most in the year.Both the high temperature days and mean daily highest temperature during annual high temperature days were negative anomaly in 1980s，and in the first 10 years of the 21st century，the high temperature days and mean daily highest temperature during annual high temperature day increased.The high temperature days in the Three Gorges Area were more (less) in gorges (mountains and hills) and north (south) of the Three Gorges Area.The change trend of high temperature was not significant in the Three Gorges Area after water storage.Besides,it should be noted that with storing water of the Three Gorges,the increasing water level and surface of it might have some influence on the local climate.Now,although some exploratory researches have been done,they could not reveal the influence of the Three Gorges on local climate completely due to the observation data. This need longterm observation and study