2011年12月3—7日山东省连续大雾分析  

Analysis of a continuously heavy fog process in Shandong province on December 3 to 7,2011

作　　者：王西磊[1] 孟宪贵[1] 赵京峰[2] 

机构地区：[1]山东省气象台,山东济南250031 [2]济宁市气象局,山东济宁272000

出　　处：《气象与环境学报》2013年第5期20-25,共6页Journal of Meteorology and Environment

基　　金：国家自然科学基金"渤海海效应暴雪的多尺度作用机制及预报技术研究"(41175044);山东省气象局2013年度面上科研课题项目"山东省大范围持续雾霾预报技术研究"(2013sdqx02)共同资助

摘　　要：利用2011年12月1—7日常规探测资料和NCEP再分析资料,采取诊断分析方法,分析了山东省大范围连续性大雾产生的天气背景、温湿条件和大气层结等特征。结果表明:此次连续大雾发生在稳定的大气层结下,高空中纬度环流平直,地面气压场上表现为从东西伯利亚到中国华南地区一个庞大的变性高压区(山东处于高压的中部),天气形势稳定;在高分辨率可见光云图上,大雾图像顶部较光滑、边缘较清晰,在红外云图上特征不明显;近地面层是较弱的东到东北风(风速在2 m·s-1以下),既有利于海洋上暖湿气流的平流输送,也为较冷下垫面的建立创造了条件;大气边界层湍流活跃,湍流动力垂直输送明显;大雾初期低空有明显的逆温层,天气状况较好,辐射降温明显,大雾性质以辐射雾为主,中后期为暖湿空气平流到温度较低的下垫面上时冷却形成,以平流雾为主。Based on the conventionally observational data and the NCEP reanalysis data from December 1 to 7,2011,the synoptic background,temperature and humidity conditions,atmospheric stratification feature of a wide area of continuously heavy fog event in Shandong province were analyzed by a diagnosis analysis method.The results show that this event occurs under stable stratification,flat general circulation at high level and mid-latitude.There is a large scale of high pressure area from east Siberia to south China,and Shandong province is located in the middle of high pressure.The synoptic situation is stable.Top of fog image is smooth and there is a clear edge on the high resolution visible cloud image,while there is not distinct feature on the infrared cloud image.The weak east to northeast wind （wind speed is less than 2 m· s-1） near the surface is favorable to advection transportation of warm and humid air flow from the ocean,and it is also favorable factors for the formation of colder underlying surface.Turbulence is vigorous in boundary layer that brings considerable vertical transportation of turbulence kinetic energy.There is a significantly inversion layer at low level in the initial period of the fog process.It is clear and radiative cooling is obvious,so the radiation fog is dominant at the early period.However,it is advection fog at the middle and late period because warm and humid air blows to colder underlying surface.

关 键 词：大雾 环流形势 诊断分析 温度平流 

分 类 号：P426.41[天文地球—大气科学及气象学]