辽宁省一次区域性大雾环流形势分析

利用2014年3月26-27日1 d 4个时次的NCEP/NCAR及ECMWF再分析资料对发生在辽宁地区的一次区域性大雾天气过程进行了分析探讨。结果表明,此次大雾期间辽宁省各市的首要污染物为PM2.5,空气质量较差,为大雾期间水汽的凝结提供了有力条件。此次大雾过程期间,高空脊前配合地面弱高压的控制有效抑制对流的发展,为雾的形成提供了有利的环流形势。大雾形成、发展期间,水汽向辽宁地区的输送及辽宁地区低空水汽的辐合有利于雾的形成、发展及维持。

Circulation Situation Analysis of a Regional Heavy Fog in Liaoning Province

Based on NCEP/NCAR and ECMWF reanalysis data of four times a day from March 26 to 27,2014,a regional fog weather process in Liaoning Province was analyzed and discussed.The results showed that the main pollutant in Liaoning Province during the fog period was PM2.5,and the air quality was poor,which provided a strong condition for the condensation of water vapor during the fog period.During the fog process,the upper ridge combined with the control of the surface weak high pressure effectively suppressed the development of convection,providing a favorable circulation situation for fog formation. During the formation and development of fog,the transportation of water vapor to Liaoning and the convergence of low-level water vapor were beneficial to the formation,development and maintenance of fog.