SPATIAL AND TEMPORAL DISTRIBUTION CHARACTERISTICS OF ATMOSPHERIC POLLUTANTS IN WUHAN FROM 2017 TO 2020
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摘要: 为进一步了解武汉市大气污染时空分布特征,对2017-2020年武汉市主要大气污染物(PM2.5、PM10、SO2、CO、NO2和O3)进行了空间插值分析、时间变化分析以及与气象要素的相关性分析。结果表明:武汉市近4年环境空气质量达标率为72.98%。PM2.5、PM10、SO2、CO和NO2具有"冬高夏低"的"V"形特征,O3 呈"夏高冬低"的变化趋势。武汉市年均质量浓度超标的大气污染物主要有PM2.5和PM10,但其年均质量浓度均呈下降趋势,而O3是年均质量浓度唯一处于上升状态的大气污染物,今后应重点关注颗粒物与臭氧污染。PM2.5、PM10、SO2、CO和NO2主要集中在武昌区、蔡甸区、青山区、江汉区、江岸区,而O3多聚集在黄陂区、新洲区和江夏区。PM2.5、PM10、SO2、CO和NO2之间均呈显著正相关,O3和其余5种大气污染物均呈显著负相关。平均气温与PM2.5、PM10、SO2、CO和NO2均呈显著负相关,与O3呈显著极强正相关;日照时长与6种污染物均呈显著负相关;平均风速与PM2.5、PM10、SO2、CO和NO2均呈显著负相关,与O3呈显著正相关;相对湿度仅与SO2呈弱相关性。影响武汉市大气污染物的主要气象要素是平均气温和日照时长。Abstract: An investigation on the spatial and temporal distribution characteristics and correlation analysis with meteorological elements were conducted on the main atmospheric pollutants (PM2.5, PM10, SO2, CO, NO2 and O3) in Wuhan from 2017 to 2020, to understand the level of atmospheric pollution in each district of Wuhan. The results were as follows:The overall achievement rate of ambient air quality in Wuhan over the past four years was 72.98%. The pollution of PM2.5, PM10, SO2, CO and NO2 was more serious in winter, and less in summer; the pollution of O3 was more in summer, and less in winter. PM2.5 and PM10 were the exceeding pollutants among the atmospheric pollutants, but the annual average mass concentrations were on a decreasing trend, while O3 was the only air pollutant whose annual average mass concentration was on the rise, so particulate matters and ozone pollution should be paid on more attention in the future. PM2.5, PM10, SO2, CO and NO2 were more concentrated in Wuchang District, Caidian District, Qingshan District, Jianghan District, Jiangan District, and O3 were concentrated in Huangpi District, Xinzhou District and Jiangxia District. PM2.5, PM10, SO2, CO and NO2 were significantly positively correlated with each other, while O3 and these five atmospheric pollutants were significantly negatively correlated. Mean temperature was significantly negatively correlated with PM2.5, PM10, SO2, CO and NO2, and significantly and strongly positively correlated with O3. Sunshine duration was significantly negatively correlated with all six pollutants. Mean wind speed was significantly negatively correlated with PM2.5, PM10, SO2, CO and NO2, and significantly positively correlated with O3. Relative humidity had the least effect on air pollutants and was only weakly correlated with SO2. The main meteorological elements affecting air pollutants in Wuhan were average temperature and sunshine duration.
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