2011年12月乌鲁木齐市一次大雾天气成因

2011年12月乌鲁木齐市一次大雾天气成因
万瑜;曹兴;窦新英;刁平
【期刊名称】《干旱气象》
【年(卷),期】2013(31)2
【摘要】Based on the NCEP reanalysis grid (1 ° × 1 °) data,conventional observations,numerical forecast products as well as wind profiler data,a large scale fog weather event occurred in the central Urumqi on 25 December 2011 was investigated from circulation background,temperature and humidity feature,stratification condition,the surface layer wind field features.The results show that the warm ridge after the upper trough,no obvious cold air activities over middle latitude,and stable atmospheric circulation background were advantageous to temperature inversion formation,and the formation and maintenance of the temperature inversion in the boundary layer played an important role on the development and sustentation of the fog weather.When the heavy fog occurred,the southeast wind was more than 20 m · s-1,meanwhile southeast gale from south suburbs and northern wind from urban area formed strong convergence around surface layer over southern urban area,which was not conducive to horizontal and vertical diffusion of urban pollutants.The heavy fog also tended to occur towards the cold air side near the convergence of the surface.Southeast gale was an important index of wind field for the heavy fog event in the central Urumqi.Wind
profiler data and EC numerical forecast production can exactly provide forecasting in advance for the southeast gale in south suburbs of Urumqi,and were helpful to predict the generation,development and dissipation of fog,which could reduce the damage caused by the heavy fog event.%利用NCEP逐日4次1°×1°再分析资料、常规观测资料、边界层风廓线雷达资料及数值预报产品,从天气背景、温湿特征、层结条件、近地面风场特征等方面分析了2011年12月25日白天乌鲁木齐城区一次大范围大雾天气的成因.结果表明:高空槽后暖脊型,中纬度无明显冷空气活动,天气形势比较稳定的大气环流背景易形成逆温,而边界层逆温层的形成与维持对大雾的发展持续具有重要作用；浓雾时,南郊一带东南风维持在20 m/s以上,与城区偏北风在城南近地层形成强辐合面,不利于城区污染物的水平和垂直扩散,且大雾也多发生在地面辐合面偏向冷空气的一侧,分析认为南郊东南大风是城区大雾维持加强的一个重要风场指标；边界层风廓线雷达资料和欧洲数值模式产品能准确提供南郊一带东南大风的提前预报量,对城区及北部出雾有较好指示作用,有助于及时准确预报大雾的形成、发展、消散过程,减轻此类灾害性天气的危害.
【总页数】7页(P383-389)
【作者】万瑜;曹兴;窦新英;刁平
【作者单位】新疆乌鲁木齐市气象局,新疆乌鲁木齐830002;新疆乌鲁木齐市气象局,新疆乌鲁木齐830002;新疆乌鲁木齐市气象局,新疆乌鲁木齐830002;新疆乌鲁木齐市气象局,新疆乌鲁木齐830002
【正文语种】中文
【中图分类】P458.3
【相关文献】
1.2011年沈阳一次大雾天气成因分析 [J], 孟鹏;安昕;杨黎黎
2.2011年12月3-7日山东省连续大雾分析 [J], 王西磊;孟宪贵;赵京峰
3.2015年11月宁夏中北部连续大雾天气成因分析 [J], 张肃诏;王建英
4.湖北国际物流核心枢纽机场2016年12月一次大雾天气过程特征分析 [J], 王保;黄思先;张火平;杨辉
5.乌鲁木齐市2018年11月12—13日低温寒潮降雪天气成因分析 [J], 安大维因版权原因，仅展示原文概要，查看原文内容请购买。