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夏季降水对合肥市大气污染物的影响
程钶强,李祥,刘念,姚瑶,文想成,杨书运
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(南京信息工程大学环境科学与工程学院,南京210044; 安徽农业大学资源与环境学院,合肥230036;安徽农业大学资源与环境学院,合肥230036; 中山大学大气科学学院,珠海519082;安徽农业大学资源与环境学院,合肥230036; 湖北省气象局,武汉430074;安徽农业大学资源与环境学院,合肥230036; 芜湖市气象局,芜湖241006)
摘要:
利用合肥市2015—2017年大气污染(PM2.5、SO2、NO2、CO、O3和PM10)监测数据及气象资料,对合肥市夏季大气污染物的浓度变化特征以及降水对大气污染物的影响进行分析。结果表明:(1)2015—2017年合肥市PM2.5、PM10浓度均有所下降,气态污染物中只有NO2浓度呈升高趋势。(2)PM2.5和PM10日变化呈双峰型,峰值分别出现在08:00—09:00和21:00—22:00,日浓度的最小值出现在午后15:00—16:00,分别为(51.01±2.72)μg·m-3和(30.64±1.86)μg·m-3。(3)气态污染物中O3和SO2日变化呈单峰型,O3和SO2峰值分别(129.35±12.52)μg·m-3和(11.80±0.77)μg·m-3。(4)降水能使大气污染物浓度特征发生明显变化:降水条件下O3浓度波动范围减小,浓度高值时段明显缩短;NO2和CO浓度明显降低,夜间NO2浓度约为非降水条件下的55% ~ 60%,CO浓度下降20%;SO2单峰型变化特征消失,小时浓度维持在9.66 μg·m-3;降水使PM2.5、PM10浓度降低的同时改变大气中不同粒径颗粒物的质量占比,降水过程中PM2.5/PM10明显升高,降水结束后该比值迅速降低。
关键词:  合肥  夏季降水  大气污染  浓度变化特征
DOI:10.13610/j.cnki.1672-352x.20220907.006
基金项目:国家自然科学基金(41771100)和安徽省省级大学生创新基金(201810364204)共同资助。
Influence of summer rainfall on air pollutants in Hefei
CHENG Keqiang,LI Xiang,LIU Nian,YAO Yao,WEN Xiangcheng,YANG Shuyun
(School of Environment Science and Engineering, Nanjing University of Information Science and Technology, Nanjing 210044; School of Resource and Environment, Anhui Agricultural University, Hefei 230036;School of Resource and Environment, Anhui Agricultural University, Hefei 230036; School of Atmospheric Sciences, Sun Yat-Sen University, Zhuhai 519082;School of Resource and Environment, Anhui Agricultural University, Hefei 230036; Hubei Meteorological Bureau, Wuhan 430074;School of Resource and Environment, Anhui Agricultural University, Hefei 230036; Wuhu Meteorological Bureau, Wuhu 241006)
Abstract:
Using the monitoring data of atmospheric pollution (PM2.5, SO2, NO2, CO, O3 and PM10) and meteorological data from 2015-2017 in Hefei, the characteristics of concentration changes of atmospheric pollutants in Hefei in summer and the influence of precipitation on atmospheric pollutants were analyzed. The results showed that: (1) The concentration of PM2.5 and PM10 declined from 2015 to 2017, and only NO2 in the gaseous pollutants showed an upward trend. (2) Diurnal variations of PM2.5 and PM10 displayed a bimodal pattern the peak values were (51.01±2.72) μg·m-3 at 8:00-9:00 and 21:00-22:00, and the lowest values were (30.64±1.86) μg·m-3 at 15:00-16:00. (3) Diurnal variation of O3 and SO2 displayed unimodal, the peak values were (129.35±12.52) μg·m-3 and (11.80±0.77) μg·m-3, respectively. (4) Summer precipitation can obviously affect air pollutants: O3 concentration fluctuation range reduced and the period of peak value shortened significantly; the concentrations of NO2 and CO declined obviously, NO2 night-value was about 55%-60% of non-precipitation conditions, and CO declined by 20%; the unimodal variation of SO2 disappeared, and hourly concentration maintained at 9.66 μg·m-3; both PM2.5 and PM10 concentration reduced, and the mass percentage of different size particles changed in precipitation, the radio of PM2.5/PM10 increased obviously during precipitation, and declined rapidly after precipitation.
Key words:  Hefei  summer rainfall  air pollution  concentration characteristics

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