山东中西部一次持续性大雾过程分析  

Analysis of a Continuative Fog Event in Western Shandong Province

作　　者：李静[1] 高留喜[1] 陈金敏[1] 高惠君[1] 

机构地区：[1]山东省气象台,山东济南250031

出　　处：《安徽农业科学》2012年第18期9787-9790,共4页Journal of Anhui Agricultural Sciences

基　　金：山东省气象局重点课题(2009sdqx207)

摘　　要：[目的]分析2011年12月3～7日山东中西部一次持续性大雾过程。[方法]利用常规气象资料,从大尺度天气背景、地面要素场、T-lnp图、水汽及物理量场方面对2011年12月3～7日山东中西部持续性大雾天气过程进行了分析,探讨此次大范围持续性大雾过程的形成和持续原因。[结果]此次大雾过程发生在500 hPa中纬度较平直的偏西气流、中低层高压脊以及地面高压底部弱气压场控制的大气环流形势下。前期的强降雪过程为大雾的形成提供了水汽条件,中低空的暖湿气流和近地面的偏东气流有利于大雾的维持和发展。大雾期间,风速一直1～3 m/s;过程前期温度露点差和能见度有明显的日变化,而中后期变化不大;在近地面有较明显的逆温层存在,同时在大雾强盛期间在700～800 hPa有明显的低空逆温层存在,这些均有利于大雾的形成和发展。大雾期间,大气层结稳定,低层存在弱的辐合上升运动,中高层存在弱的辐散下沉运动,这些也有利于大雾的维持和发展。[结论]该研究为大雾天气的预测预报提供理论依据。[ Objective ] The aim was to study a continuative fog event in center and western Shandong Province from December 3 to 7 in 2011. [ Method] Based on regular meteorological data, a continuative heavy fog weather process during December 3 to 7 in 2011 was analyzed from the aspects of weather background, ground factors, T - lnp, and moisture and physical quantity field. [ Result] The heavy fog occurred under then atmospheric circulation pattern controlled by the straight westerly air flow at 500 hPa middle latitudes, ridge of high pressure at middle and low levels, and weak pressure at the bottom of the surface high. The snowfall process for the formation of fog provided vapor conditions of fog, maintenance and development had benefited from lower layer of the warm and humid airflow. During the heavy fog, wind speed was be- tween 1 and 3 m/s. The dew difference and visibility in the early period had distinct daily changes, while the difference narrowed in the mid- dle and later stage. Close to the ground was an obvious inversion layer, at the same time in the fog strong period temperature inversion layer were apparent between 700 and 800 hPa, these were helpful for fog formation and development. The stable atmospheric stratification, while low layer of weak convergence ascending motion, high level in the presence of weak divergence subsidence, these were also conducive to the maintenance and development of the fog. [ Conclusion] The study provided theoretical basis for the forecast of fog weather.

关 键 词：持续性大雾 山东中西部 过程分析 

分 类 号：S161.5[农业科学—农业气象学]