冬季局地大气SO_2浓度变化的天气气候学方法研究

A STUDY ON LOCAL SULFUR DIOXIDE CONCENTRATION USING SYNOPTIC CLIMATOLOGICAL APPROACHES

本文根据一种气团客观分类方案，在对研究区域气团类型进行分类的基础上，研究了局地ＳＯ_２浓度随气团类型的变化。结果表明，ＳＯ_２浓度值作为气团类型的函数变化是显著的；较高的ＳＯ_２浓度值出现在那些变胜深、移动慢、持续时间长的反气旋中；个例分析揭示了一次持续时间较长的高ＳＯ_２浓度事件的出现与对流层中层的一次中期天气过程的发生、发展、崩溃过程间的良好对应关系。

The purpose of this study is to use a methodology to characterize air masses at a given location and to deal it with sulfur dioxide (SO_2) concentrations. The SO_2 concen- trations studied vary significantly as a function of air masses. We were able to identify air mass categories exhibiting above nomal SO_2 concentrations, extreme SO_2 concentrations and synoptic scenarios of long duration contributing to high SO, concentration 'episodes'. A case study was also carried out. The results show that in those strongly affected,slow moving an- ticyclones with long duration,the high SO_2 concentrations,the high concentration'episodes 'is just accompanied by a mid-period synoptic activities in 500hpa. This suggests that the synop- tic climatological approaches should have greater potential on the study of long range vari- ability of pollutant concentrations,the development of forecasting and warning systems of lo- cal severe polutant episodes.