21世纪以来，随着经济发展对能源需求的迅猛增长，我国东部冬季灰霾污染事件频繁发生。受限于能源结构和排放控制技术，短期内空气污染问题很难彻底得到解决。在此背景下，从天气学角度理解环流形势的变化对冬季大范围灰霾天气的防治及预测有重要的现实意义。本项目从数值模拟角度来计算冬季天气尺度环流对我国东部气溶胶浓度时空分布及扩散传输的影响。研究内容包括：（1）我国东部地区冬季冷空气活动的强弱变化及同期气溶胶浓度的时空分布；（2）利用WRF-CHEM模式研究环流形势的差异对气溶胶浓度时空分布及扩散传输的影响；（3）从天气动力学角度解释动力学指数对研究区冬季气溶胶污染发生演变的指示性；（4）评估该类指数对研究区冬季气溶胶浓度时空分布及扩散传输的意义。该研究成果将有益于国家在周至月尺度上针对不利气象条件，及时制定更加科学的污染源排放管控措施，有效避免重污染事件发生。

China is experiencing a vigorous economic boom in the 21th century. The subsequent increased energy demand and large amount of pollutants emission have caused serious or hazardous air pollution in winter. Such highly concentrated and widely spread particles put a threat to public health. However, based on national energy structure and developing emission control technology at present, it is difficult to fundamentally solve the problem of air pollution in a short term. Synoptic-scale circulations play important roles in modulating air pollution so that improving the understanding of the variability of the circulation pattern is quite important to forecast and prevent regional haze events in winter, China. The proposal will mainly use WRF-CHEM model, and combine with surface measurements and meteorological reanalysis data together to explore how short-term (weeks to month) synoptic-scale circulations affect the spatial and temporal variations of aerosol concentration and transport pathways. Firstly, the intensity of Siberian High implying for activities of cold air masses, and the spatial and temporal variations of aerosol concentration will be analyzed in Eastern China. Secondly, the impacts of different synoptic-scale circulations on the distribution and transport of aerosol concentration will be calculated by the WRF-CHEM model. Finally, we will establish the relationships between the aerosol pollution and the dynamical indices that reflect the intensity of high- and mid-latitude meridional circulations over Eurasia, with a view to assess the implication of these indices for aerosol concentration and transport in winter. To understand the link between synoptic meteorology and aerosol pollution will be helpful for the government to more scientifically implement the emission control and reduction measures in a short term (weeks to month) under the adverse meteorological conditions.