Abstract:

Based on the 17 series of main annual climatic factors and its extreme values in Wuhan from 1951 to 2007,the features of main annual climatic factors in Wuhan responding to global climate change and local urbanization are revealed through trends analysis,decadal comparisons and cause analysis.The results are as follows:all the 5 temperature series in Wuhan show ascending trend,among which annual mean temperature,mean minimum temperature and extreme minimum temperature show obvious ascending trend and the ascending paces accelerated after the middle and late 1970's.The trends of 4 precipitation factors are not all distinct,among which only annual rainy days is near to 0.1 level of the significance with statistical test.The annual amount of rainfall shows slight ascending tendency and obvious decadal variation,and it is rather greater distinctly in 1950's,1980's and 1990's.Annual rainy days and the maximum daily precipitation show descending trend while heavy rain day are increasing.Both of annual mean relative humidity and minimum relative humidity show descending trend,and annual mean relative humidity descends with the level of extreme significance.Annual mean wind velocity,maximum wind velocity,extreme wind velocity and days with wind of gale force all decreasd with the level of extreme significance.Annual hours of sunshine mainly show decreasing trend.Annual mean air pressure increased first and then decreased while the ascending trend was not obvious.Above all,most of annual climatic factors changed obviously while precipitation and air pressure changed slightly,which is the result of global climate change and rapid urbanization.

Key words: Wuhan/ main climatic factors/ extreme values/ decade/ trend/ climate change