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连云港市大气降尘时空分布特征
姚瑶
江苏省连云港环境监测中心
摘要:
采用2018年1月-2020年2月连云港市17个监测点降尘数据,研究连云港市大气降尘变化规律和时空分布特征。结果表明,2018年连云港市平均降尘量为11.6 t/km2?30d,超过江苏省考核标准(6吨/月?平方公里),超标率为93.3%,呈现出先增大再降低再增大的规律,春季、秋季降尘量最高,与大风、干燥天气有关;除了8月,县区降尘量均高于市区;市区降尘量变化比较平稳,县区下半年变化幅度比较大;各监测点降尘分布存在明显差异。市环境监测站、胡沟管理处、德源药业、矿山设计院四个监测点的降尘量与PM2.5及PM10质量浓度相关性较高,说明降尘与PM2.5及PM10的来源具有一致性。2019年降尘量明显降低且差异略小,除了春季(3月、4月)超标,其他均达标。
关键词:  降尘量  时空分布  连云港市
DOI:
分类号:X51
基金项目:
Temporal and Spatial Distribution Characteristics of Atmospheric Dust-fall in Lianyungang city
Abstract:
Based on dust-fall data of Lianyungang 17 monitoring points during January 2018-February 2020, temporal and spatial distribution characteristics of atmospheric dust-fall in Lianyungang city were researched. The results showed that the average amount of dust-fall in Lianyungang was 11.6 t/km2?30d, which exceeded the assessment standard of Jiangsu Province(6 t/km2?30d) in 2018. The rate of exceeding the standard was 93.3%. It showed the regular of first increasing , then decreasing, then increasing. The highest amount of dust-fall in spring and autumn were related to strong wind and dry weather. Except for August, the dust-fall in the county area was higher than that in the urban area. The change of dust-fall amount in urban area was relatively stable, while the change of county area was relatively large in the second half of a year. The distribution of dust-fall in each monitoring point was obviously different. There was higher significant correlation between the dust-fall and the mass concentration of PM2.5 and PM10 at four monitoring sites, including Lianyungang Environmental Monitoring Station, Hugou Management Office, Deyuan Pharmaceutical Co., Ltd and Bluestar Lehigh Engineering institute Co., Ltd.. The result showed that the dust-fall was consistent with the source of PM2.5 and PM10. The amount of dust-fall was obviously lower and smaller difference in 2019,which reached the standard except in spring(March and April).
Key words:  Dust-fall  Temporal and spatial distribution  Lianyungang city