Influence of dust storms on air pollution for replacement and addition in Lanzhou
LIU Xiao-ran1, WANG Jin-yan1,2, QIU Ji-yong1,3, LI Quan-xi1, DONG Ji-yuan4, WEI Lin-bo1
1. College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China; 2. Key Laboratory for Semi-Arid Climate Changes with the Ministry of Education, Lanzhou University, Lanzhou 730000, China; 3. 95871 Troops of PLA, Hengyang 421000, China; 4. School of Public health, Lanzhou University, Lanzhou 730000, China
Abstract：Characteristics of the concentrations of particulate pollutants PM10, PM2.5 and gaseous pollutants SO2, NO2, CO and O3 during spring dust storms in 2014 and 2015 were analyzed. The result showed that dust storms could cause the increasement of PM10 and PM2.5 for both the replacement type and the addition type, while the decreasement of SO2、NO2 and CO for the replacement type, while the increasement for the addition type. However, the concentration of O3 almost kept stable during spring dust storms. For the replacement type, the average concentrations of PM10 and PM2.5 were 1086.9 and 286μg/m3 respectively, and those of SO2, NO2 and CO were 6.7, 41.0 and 1.02×103μg/m3 respectively. For the addition type, the average concentrations of PM10 and PM2.5 were 383.2 and 116.2μg/m3 respectively, and those of SO2, NO2 and CO were 24.5, 49.1 and 1.19×103μg/m3 respectively. In short, the average concentrations of PM10 and PM2.5 of the replacement type were 2.8 and 2.4 times more than those of the addition type, and the average concentrations of SO2, NO2 and CO of the replacement type were 1.47, 1.2 and 1.17times more than those of the addition type. The meteorological conditions of the replacement type were strong northeast wind near surface, significant temperature decreasement and high pressure. In other words, strong cold air activity resulted in increase of PM10 and PM2.5 and decrease of SO2, NO2 and CO. The dust sources of this type were in Taklimakan Desert and the northern part of Qinghai Tibet Plateau, and the influence flow were high-altitude northwest wind at the height of 1500 to 6000 meters. However, the meteorological conditions of the addition type were weak northeast wind near surface, no significant change of temperature and pressure. In other words, weak cold air activity resulted in increacement of PM10 and PM2.5 and decreacement of SO2, NO2 and CO at the early stage. And then, the concentrations of PM10 and PM2.5 kept at high levels, and the concentrations of SO2, NO2 and CO start to rise. The dust source of this type were mainly in Badan Jilin desert, and the influence flow was low-altitude northwest wind below 1500meters.
刘筱冉, 王金艳, 邱继勇, 李全喜, 董继元, 魏林波. 沙尘天气对兰州市大气污染物置换和叠加作用[J]. 中国环境科学, 2018, 38(5): 1646-1652.
LIU Xiao-ran, WANG Jin-yan, QIU Ji-yong, LI Quan-xi, DONG Ji-yuan, WEI Lin-bo. Influence of dust storms on air pollution for replacement and addition in Lanzhou. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(5): 1646-1652.
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