| 常熟市秋冬季典型大气重污染过程中PM2.5及其主要化学组分分析 |
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| 引用本文： | 丁淑琴,吴家平,万学平,蒋琳,赵雪婷,沙丹丹. 常熟市秋冬季典型大气重污染过程中PM2.5及其主要化学组分分析[J]. 环境工程, 2020, 38(3): 142-147+161. DOI: 10.13205/j.hjgc.202003024 |
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| 作者姓名： | 丁淑琴 吴家平 万学平 蒋琳 赵雪婷 沙丹丹 |
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| 作者单位： | 1. 常熟市环境监测站, 江苏 常熟 215500; |
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| 摘 要： | 利用2018-11-21—12-05常熟市空气质量自动监测站点的常规参数逐时数据、细颗粒物化学组分数据及大气颗粒物激光雷达监测结果,对常熟地区秋冬季一次重污染过程中PM2.5及其主要化学组分(水溶性离子)的污染特征进行系统分析。结果表明:11-24—12-03常熟地区出现了一次持续重污染过程,PM2.5浓度高值主要出现于高湿、小风、低边界层的天气条件下,且PM2.5浓度与湿度呈显著正相关,受不利扩散条件下的局地污染累积及高湿状态下颗粒物二次转化影响较大。观测期间,二次离子(NO-3、NH+4、SO42-)在水溶性离子中占比较高,尤其是污染期,占比高达97%,受二次生成影响较大;其中,NO-3在水溶性离子中占比最高。整个分析时段,SOR与NOR均值分别为0.38与0.22,污染期间SOR与NOR均值明显升高,分别达到0.47与0.32;4个阶段内仅有...
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| 关 键 词： | 常熟 PM2.5 重污染过程 水溶性离子 污染特征 |
| 收稿时间： | 2019-07-12 |
ANALYZE ON PM2.5 AND ITS MAIN CHEMICAL COMPOSITION DURING TYPICAL HEAVY AIR POLLUTION IN AUTUMN AND WINTER IN CHANGSHU |
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| DING Shu-qin,WU Jia-ping,WAN Xue-ping,JIANG Lin,ZHAO Xue-ting,SHA Dan-dan. ANALYZE ON PM2.5 AND ITS MAIN CHEMICAL COMPOSITION DURING TYPICAL HEAVY AIR POLLUTION IN AUTUMN AND WINTER IN CHANGSHU[J]. Environmental Engineering, 2020, 38(3): 142-147+161. DOI: 10.13205/j.hjgc.202003024 |
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| Authors: | DING Shu-qin WU Jia-ping WAN Xue-ping JIANG Lin ZHAO Xue-ting SHA Dan-dan |
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| Affiliation: | 1. Changshu Environmental Monitoring Station, Changshu 215500, China;2. Jiangsu Ence Testing Technology Co., Ltd, Changshu 215500, China;3. Wuxi CAS Photonics Co., Ltd, Wuxi 214135, China |
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| Abstract: | Based on the hourly data provided by Changshu Environmental Monitoring Station and chemical composition data of PM2.5 and lidar monitoring data from November 21st to December 5th in 2018, the pollution characteristics of PM2.5 and its main chemical composition (water-soluble ions) in a heavy pollution process in Changshu were systematically analyzed. The results showed that Changshu occurred a continuous heavy pollution process from November 24th to December 3rd, the high PM2.5 concentration mainly occured in higher humidity, lower wind and lower boundary layer weather conditions, and the PM2.5 concentration was positively correlated with humidity. Accumulation of local pollution under adverse diffusion condition, the increase of moisture absorption of particulate matter under high humidity conditions and secondary transformation were the main causes of pollution. During the observation period, secondary ions(NO3-、NH4+、SO42-)accounted for a higher proportion (as high as 97%) of water-soluble ions, especially in the pollution period, which was greatly affected by secondary formation, and NO3- accounted for the highest proportion of water-soluble ions. During the whole analysis period, the mean values of SOR and NOR were 0.38 and 0.22, and the values increased significantly during the pollution period, reaching 0.47 and 0.32, respectively. The cumulative growth rates of NO3-, SO42- were higher than those of CO only in the pollution period, and the concentration of NO3- was higher than SO42-, which indicated the pollution was mainly affected by the secondary generation of NO2. It was necessary to strengthen the control of industrial emission sources and motor vehicle exhaust sources during heavy pollution period. |
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