银川市冬季一次沙尘污染过程分析

Analysis of Dust Pollution Process in Winter of Yinchuan

文章借助银川市大气环境超级站监测资料,分析2018年2月8～9日银川市冬季一次沙尘污染过程颗粒物的水平、垂直分布特性,并分析沙尘来源及传输过程。结果表明:2月8～9日,银川市沙尘的传输方向为西北方向,沙尘过境阶段近地面总悬浮颗粒物(TSP)、颗粒物(PM_(10))呈快速上升趋势,颗粒物(PM_1)的浓度及颗粒物(PM_(2.5))/颗粒物(PM_(10))比值呈明显下降,能见度由20降至5 km左右。此次沙尘污染过程是以粗粒子模态颗粒物为主的污染过程,污染主要原因是冷锋过境大风携带来自西北方向新疆北部和内蒙古西部的上游外源沙尘。

Based on the monitoring data of Yinchuan atmospheric environment super station,this paper analyzed the horizontal and vertical distribution characteristics of particulate matter during a winter dust pollution process in Yinchuan City,from February 8 to 9,2018.It also analyzes the source and transmission of dust.The results showed that,from February 8 to 9,the transmission direction of sand and dust in Yinchuan City was northwest.The total suspended particles(TSP) and particles matter (PM 10 ) near the ground surface were rapidly increased during the passage of sand and dust.The concentration of particles matter (PM 1) and the ratio of particles matter (PM 2.5 ) to particles matter (PM 10 ) decreased significantly,and the visibility was reduced from 20km to about 5 km.The dust pollution process was mainly caused by coarse mode particles.The main reason for the pollution was that the passing cold front wind carries dust from Northern Xinjiang and Western Inner Mongolia.