新疆百里风区风廓线观测分析

利用2009年3月25日至4月8日在新疆百里风区十三间房气象站观测取得的风廓线资料,分析了该地区低空风场的平均日变化、逐日变化以及强风天气条件下大气风场特征。研究表明:①十三间房地区观测期间纬向风主要盛行西风气流,经向风以北风为主,在大风天气条件下经向北风气流明显大于同时间纬向西风气流。②受七角井山口狭管效应的影响,该地区1500m高度以下水平风速总体大于其上风速。③日、夜平均廓线分析表明,夜间风速大于白天,但二者随高度的变化趋势基本相同,1500m以下,水平风速随高度的升高呈减小趋势,1500m以上,随高度升高呈增大趋势。④Airda3000Q型边界层风廓线雷达可获得时间和空间分辨率较高的风场资料,通过分析其探测到的水平风廓线资料,可清晰地监测大风天气的发生和变化过程。

Observational Study of Wind Profiles in Gale Area in Xinjiang

To study the atmospheric wind field characteristics in the 100-kin Gale Area in Xinjiang, the Institute of Urumqi Desert Meteorology of the China Meteorological Administration carried out an observation experiment from 25 March to 8 April 2009 at Shisanjianfang Station, which is within the 100- kin Gale Area in Xinjiang. The diurnal and day-to-day variations of the lower-level wind fields are analyzed by using the wind profile data from the Airda-3000Q wind-profiler radar system. The results show： （1） in this area, west and north winds prevailed, and longitude-direction winds were evidently greater than latitude-direction winds on the same time; （2） the horizontal wind speeds below 1500 meters were in general obviously greater that those above 1500 meters, influenced by the funneling effect of the Qijiaojing pass; （3） the analysis of the average profiles in day and night time shows that the night-time wind speed was greater than that of the whole day, but the change trends with height were basically same for both, with the wind speed being decreasing with the increasing height below 1500 meters and increasing above 1500 meters; （4） the high temporal-spatial resolution data of wind profiles were obtained by means of the Airda3000Q boundary layer wind profiler radar, which can be used to monitor the occurrence and change processes of gale weather.