天津地区沙尘天气与沙尘污染程度特征分析

Sand-dust Weather and Feature of Particulate Matter Pollution Extent in Tianjin

针对天津地区沙尘天气过程环境空气中颗粒物的污染时空分布特征进行了系统分析。在分析我国沙尘发生频源区域分布、输送途径基础上,分析了天津地区特殊的地理位置及地处沙尘暴多发区下游,空气中颗粒物的污染特征,概述了沙尘天气对空气质量影响程度的年、季、月及日污染时空变化分布特征。建立了沙尘天气颗粒物与有效水平能见度乘幂指数相关方程,为沙尘污染程度的诊断提供了依据。

The feature of time and space distribution of the particulate matter pollution were systematically analysed in the air of Tianjin when the sand-dust weather passed through the city.On the basis of the analysis of the dust's source distribution and move route,it analysed Tianjin's idiosyncratic geographical position,which locates lower reaches of the high occurrence area of dust and sand storm,the pollution feature of the particulate matter in the air in Tianjin;summarized the time and space variation of the air pollution extent during a year,a season,a month and a day influenced by sand-dust weather.It also established an exponent equation of the relevance between the particulate matter and the horizontal visibility in sand-dust weather,thus offering the rationale for assessing the particulate matter pollution extent.