The main results are as follows : ( 1 ) in the most of places of naqu , the annual sunshine duration are more than 2550 hours and average wind velocity are higher than 4m ? s ^ ( - 1 ) . ( 2 ) the sunshine duration in spring , summer , autumn , winter , growing season ( from may to september ) and a year all decreased in recent 40 years . ( 3 ) the wind velocity in winter decreased and the wind velocity in other 5 periods all increased . ( 4 ) the sunshine duration and wind velocity in 1990 ' s were smaller than that in 1980 ' s for all 6 periods . ( 5 ) the sunshine duration and wind velocity from 2000 to 2005 could continue to decrease 主要结果是：那曲大部分地区，年总日照时数大于2550小时，年平均风速大于4m ? s ^ ( - 1 ) ；近40年那曲地区春季、夏季、秋季、冬季、生长季（ 5 - 9月）和年6个时段的日照时数均呈减少趋势；风速冬季呈减少趋势，其它时段呈增加趋势； 6个时段的90年代日照和风速都小于80年代； 2000 - 2005年日照时数和风速继续减小的可能性比较大。
