Changes of wind speed in Tianshan Mountains

Based on the daily data of 24 meteorological stations from 1960 to 2009 and combined with the methods of linear analysis,IDW,Mann-Kendall and Matlab7.0 software,the temporal and spatial variation of wind speed,abrupt year and periodic variation were analyzed in this study.The results indicated that the changing rate of annual wind speed was-0.013m·s-1·a-1 in Tianshan Mountains.That is to say the wind speed in Tianshan Mountains showed a remarkable decreasing tendency even more remarkable than that of China,and so was it in the four seasons;The annual wind speed decreased in 1960s and 1990s,but the extent of decreasing declined slightly from 2000.The exam of wind speed mutation was remarkable,and it occurred in 1980 and 1977;The annual wind speed anomaly sequence surged about 11 years remarkably and 3 years secondly,but a longer periodic change in wind speed may be existed because of the short time sequence;Negative correlation was found between the wind speed and temperature,which meant the wind speed was influenced by the temperature,especially for the mean minimum temperature.