关键词: 风廓线雷达, RASS系统, 信噪比, 风切变, 沙尘天气

Abstract: In order to study sand-dust weather process using wind profiler radar(WPR), a case analysis of WPR detecting sand-dust weather which happened in Taklimakan Desert on April 19—20, 2010 was conducted. The results show that WPR may be used to detect sand-dust weather and its data can reflect the character of large gale flow field. It provides many kinds of data such as horizontal wind, vertical wind, signal to noise ratio, C2n and air temperature etc, and the sand-dust weather process can be analyzed from many angles. In this sand-dust process, the signal to noise ratio data clearly present a large value layer, and preliminary analysis shows that the large value layer is the height where sand-dust is transported. The starting and ending time of large value layer of the signal to noise ratio is corresponding with the starting and ending time of sand-dust weather process. The time of low altitude wind shear is corresponding with the starting time of sand-dust weather process. The maintaining of low altitude east wind is the dynamic condition of sand-dust weather. Moreover, RASS can monitor the air temperature variety during sand-dust weather process.

Key words: wind profile radar, RASS, signal to noise ratio, wind shear, sand-dust weather