关键词: 库姆塔格沙漠, 风场, 日变化, 季节变化, 起沙风

Abstract: The Kumtagh Desert is known as the sixth largest desert in China. The desert is extremely arid with sparse vegetation, and it's the last desert to be comprehensively studied in China. The daily change and seasonal change of wind field in the desert and the character of the sand-blowing wind in the desert were analyzed by use of the data of October 2007 to September 2008 from 2 automatic wind observation stations established in west and east Kumtagh Desert, and 2 automatic climatic stations located in north and south Kumtagh Desert. The analyzed data also included grid point data of wind field of MICAPS during the corresponding period received from VSAT. The results are as follows. (1) There's a daily change of wind field, like the shift of mountain and valley wind, in the Kumtagh Desert because of the uplift effect of the Altyn Tagh Mountains, and the predominant wind is in northern direction in day time and in southern direction in the night. The transition time of wind direction is different in different seasons. (2) Southern wind is predominant in winter and northern wind is predominant in summer. In spring or autumn, northern wind controls the north part of the desert, southern wind controls the eastern and southern parts, and eastern wind controls the western part. (3) Sand-blowing wind is principally the northern one, and the northeastern wind controls the western and the northern Kumtagh Desert, northwestern wind controls the eastern and the southern Kumtagh Desert. In the middle of the Kumtagh Desert, from the northern part to the southern part, the wind direction is from northeastern wind to northern wind and last to northwestern wind. The change of wind direction is as same as rotating of dune orientation in the Kumtagh Desert.

Key words: wind field, daily change, seasonal change, sand-blowing wind, Kumtagh Desert