Analyses on Variations of the Temperature and Precipitation in the North Slope Area of the Western Tianshan in the Recent 50 Years

[Objective] The research aimed to analyze variation characteristics of the temperature and precipitation in the north slope area of the Western Tianshan.[Method] According to temperature and rainfall data from 1961 to 2010 at three meteorological stations in the north slope area of the Western Tianshan,climate change in the zone in recent 50 years was analyzed by using linear trend analysis method and 5-year moving average method.[Result] The temperature in the north slope area of the Western Tianshan showed significant warming trend.The annual average temperature significantly increased at 0.3 ℃/10a in recent 50 years.But the rise rates of temperature in different seasons were different: autumn winter spring summer.The annual rainfall in the north slope area of the Western Tianshan in recent 50 years total presented relative increase trend.Seen from annual rainfall,it significantly increased at 16.9 mm/10a.Seen from seasonal rainfall,except in autumn,rainfalls in other three seasons in the past 50 years showed significant increase trend,with amplitude of 3.2-11.2 mm/10a.The largest increase amplitude was in summer.After a small precipitation peak in the 1980s,autumn rainfall slightly declined in the past 20 years.[Conclusion] The climate in the north slope area of the Western Tianshan become warm and wet.