Analysis on the characteristics of temperature and precipitation and break in Urumqi since recent 47 years

In this paper,the recent 47a of ground-based observations,the change trend of annual air temperature and precipitation,methods of regression analysis and moving average were used to study the climatic changing trend of the study area under the background of global warming.Results showed that the change trend of annual air temperature in Urumqi was accorded with that in northwestern China since the 1990s except the negative correlation between the annual temperature in Urumqi and that in northwestern China in the 1960s、1970s、1980s,and the temperature increased continuously.In spring and summer,changing trends of temperature was downward,in autumn and winter,changing trends of temperature was upward,and the winter's was the biggest.Four seasons' precipitation changing trends were upward,especially the winter was obvious.Methods of T checking、YAMAMOTO(SNR)、Cramer and Mann-Kendal were employed to analyze the climatic break indicating that the abrupt change of temperature was more noticeable than that of precipitation in the study area.The abrupt change of temperature may occur in 1962.