Analysis of a Continuative Fog Event in Western Shandong Province

• 作者: LI Jing GAO Liu-xi CHEN Jin-min GAO Hui-jun
• 来源期刊: 气象与环境研究：英文版
• 学科: 地球科学
• 关键词: 山东省 西部 雾分析 大雾天气 中纬度地区 气象数据 天气背景 天气过程
• 年，卷（期）: 2012,（7）
• 页码范围: 19-22
• 页数: 4页
• 分类号: P457.6

摘要

[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 between 1 and 3 m /s. The dew difference and visibility in the early period had distinct daily changes,while the difference narrowed in the middle 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.