关键词: 库姆塔格沙漠, 风场分析, 羽毛状沙丘

Abstract: Based on the dataset of NCEP (National center of environment prediction, USA) and NCAR (National center of atmosphere research) reanalysis-2 daily average wind data 10 m from surface in 27 years from 1979 to 2006 and the observations of ground weather stations, some statistic characteristics of wind system in Kumtag desert were analyzed. The conclusions are as follows: In spring, summer, autumn and winter, north and northeast wind directions are dominant in the desert; Wind is stronger in spring and summer than in autumn and winter; The southward airflow evolved into three branches due to decreasing north wind strength combined with effect of uplifting landforms of Qinghai-Xizang Plateau; There is northeast wind in mid-west of the desert and southwest wind in the mid-east, and the southwest wind is weaker in spring and summer but stronger in autumn and winter. Analysis on the wind system according to observations of 6 stations around the desert suggests that the wind speed in Kumtag desert existed obvious periodic change, being in trough period in the past 10 years and appearing increasing trend in recent years.

Key words: Kumtag desert, wind analysis, featherlike dune ridges