Climatic characteristics of precipitation in different grade at Maqu

The climatic characteristics of precipitation in different grade at Maqu between 1967 and 2008 were analyzed by using the data of daily precipitation and temperature from Maqu and surrounding meteorological stations. The climatic characteristics of different grade precipitation at the time scales of pentad, ten days, month and year in Maqu has been studied by using the linear tendency evaluation, Morlet continuous wavelet transform and the other methods. The results show that: Maqu, as the test areas about rain stimulation by artifical means, its characteristics of precipitation can be used to represent the surrounding areas. With global warming, precipitation of Maqu and Maqu regions gradually decreases. The starting and ending date of storm rain in Maqu, which located in northeast side of Tibet plateau, were later than that in Pingliang, which located in southeast of Gansu province. Maqu precipitation is relatively less during mid-July to mid-August (from the 39th to 46th pentad), but have a relative peak in the 42th pentad. The starting date of the moderate rain was being became earlier with time, the ending date of the moderate rain had little changed.