连云港市春季一次沙尘过程的特征分析

Characteristics of a Dust Process in Spring in Lianyungang City

本文通过利用大气超级站的各种仪器监测数据,对连云港市一次沙尘过程的特征进行分析。结果表明,在沙尘过境后,PM10浓度大幅度上升,沙尘主要影响的是可吸入颗粒物。同时,激光雷达退偏振比明显上升,消光系数的高度也明显抬升。沙尘过境前后,硫酸盐、硝酸盐、铵离子浓度明显大幅度下降,而钙离子和镁离子的浓度明显上升。二次水溶性离子浓度明显下降,一次水溶性离子浓度明显上升。无机元素总浓度迅速上升,之后迅速下降。地壳元素有大幅度增长,如Si、Al、Ti和Ca等元素;而污染元素明显下降,如Zn和Pb等元素。沙尘影响期间,扬尘是各类污染源中的首要污染源。沙尘过境后,扬尘与工业源占比均上升。机动车尾气占比明显下降,海盐占比有所上升。

This paper analyzes the characteristics of a sand and dust process in Lianyungang City by using the monitoring data of various instruments of the atmospheric super station. The results showed that the concentration of PM10 increased sharply after the sand and dust passed, and the dust mainly affected the inhalable particulate matter. At the same time, the depolarization ratio is significantly increased, and the height of the extinction coefficient is also significantly increased. Before and after the sand and dust, the concentration of sulfate, nitrate, and ammonium ions decreased significantly, while the concentration of calcium ions and magnesium ions increased significantly. The concentration of secondary water-soluble ions decreased significantly, and the concentration of primary water-soluble ions increased significantly. The total concentration of inorganic elements rises rapidly, and then drops rapidly. Crustal elements have increased significantly, such as Si, Al, Ti, and Ca;while pollution elements have decreased significantly, such as Zn and Pb. During the impact of sand and dust, dust is the primary source of pollution among all kinds of pollution sources. After the sand and dust, the proportions of dust and industrial sources both increase. The proportion of motor vehicle exhaust gas has dropped significantly, and the proportion of sea salt has increased.