Abstract:

Based on the various climate factor data from 17 meteorological stations during 1961~2008，characteristics of climate change in the Three Gorges Reservoir Area were analyzed,and climate effects after water storage were discussed.The results showed that in recent 48 years annual mean temperature increased,and the increase mainly started from 1990 s.Mean winter temperature increased significantly.From the annual mean maximum/minimum temperature,autumn mean maximum temperature increased obviously.Annual,autumn and winter mean minimum temperature increased sharply.The change trend of annual rainfall was not obvious and autumn rainfall decreased sharply.Annual,winter and summer sunlight decreased obviously,and annual,winter and summer mean relative humidity increased evidently.Annual and seasonal mean wind speeds decreased markedly.Annual rain days,moderate rain days and light rain days decreased, but the trend was not obvious.Heavy rain days and hard rain days had no obvious trend.High temperature days had no obvious trend,but increased in the period of 2001~2008 years,especially for 2006.After water storage,the rainfall in the Three Gorges Reservoir Area seems to have no obvious change.The expanding water surface area of reservoir seems to have increasing temperature effect in winter and decreasing effect in summer.〖