关键词: 持续浓雾, 垂直风场结构, L波段探空, 边界层风廓线雷达

Abstract: By using the realtime data from wind profile radars and the Lband sounding system, the characteristics of vertical wind profile during persistent heavy fog processes at Urumqi airport from 2014 to 2016 were analyzed. The results are as follows: (1) There were four upper air circulation patterns during persistent heavy fog processes at Urumqi airport, including frontridge pattern, ridge pattern, westerly wind fluctuation pattern and horizontal trough pattern. (2) The major forms of vertical wind profile were identified as TypeⅠ(WNW wind layer and boundary layer wind field) and TypeⅡ (WNW wind layer, SE wind layer and boundary layer wind field). (3) The bottom of the WNW wind layer was lowest under the circumstances of frontridge and horizontal trough pattern. The SE wind layer was thickest under the circumstances of westerly wind fluctuation pattern. (4) The evolution of the vertical wind field had a time advance of 1-2 h, and the regularity played a certain role in the prediction of persistent heavy fog weather.

Key words:  persistent heavy fog, vertical wind profile, Lband sounding system, boundary layer wind profile radar