摘要
为了揭示我国南方典型工业城市空气质量在时间尺度上的变化特征,该文基于2016年11月至2020年7月衡阳市逐时空气质量指数、首要污染物资料,分析了衡阳市空气质量指数在日、周、季节尺度上的变化以及空气质量等级和首要污染物在不同季节的差异。研究发现:1)衡阳市AQI在日内、周内以及年内三个时间尺度上具有一定的规律性:在日内,AQI呈现双峰型,峰值分别出现在上午11时前后和夜间21时前后,谷值则分别出现在清晨6时前后和下午16时左右;在周内,AQI无明显变化规律;在年内,AQI具有明显的季节变化,具体表现出春夏低,秋冬高,夏季为最低值,冬季为最高值。另外,研究时段内,衡阳市空气质量呈逐步改善的态势。2)衡阳市日AQI对应空气质量等级在夏半年(对应4-9月)基本上均为优、良,冬半年(10-次年3月)优、良明显减少,而轻度污染、中度污染、重度污染出现概率增大。3)衡阳市首要污染物以PM2.5为主,PM10次之,且冬半年以PM2.5为主,夏半年以PM10为主。
In this study,the temporal characteristics of air quality in typical industrial city in southern China is revealed by using hourly air quality index(AQI)and priority pollutants data of Hengyang from Nov.2016 to Jul.2020,and the changes of AQI within days,weeks and seasons,as well as the differences of air quality levels and priority pollutants in different seasons were analyzed.The results show that:1)The variation of AQI has a certain regularity in the three time scales:within the day,AQI presents double peak type,the peak appears around 11:00 a.m.and 21:00 p.m.,and the valley value appears around 6:00 a.m.and 16:00 p.m.respectively;during the week,the change of AQI with no significant regularity.For seasons,monthly AQI indicates that the AQI was low in spring and summer,high in autumn and winter,the lowest appears in summer and the highest in winter.In addition,during the study period,the air quality in Hengyang gradually improved.2)The air quality levels referring to daily AQI in Hengyang are basically excellent and good in the warm half year(from April to September),excellent and good in cold half year(from October to March of the next year)are significantly decreasing,and mild pollution,moderate pollution and severe pollution are increasing.3)The priority pollutant in Hengyang is PM2.5,followed by PM10,and the priority pollutantPM2.5 appears in cold season and PM10 in warm season.Our findings can provide scientific basis for the government to make air pollution control policies and the daily life of citizens.
作者
黄一民
钟顺清
邹君
Huang Yimin;Zhong Shunqing;Zou Jun(College of City and Tourism,Hengyang Normal University,Hengyang Hunan 421002,China;Research Center for Environment Education of Hunan Province,Hengyang Hunan 421002,China)
出处
《衡阳师范学院学报》
2020年第6期116-122,共7页
Journal of Hengyang Normal University
基金
湖南省教育厅优秀青年项目(18B370)
湖南省教育厅创新平台开放基金项目(19K012)。
关键词
衡阳市
空气质量
时间特征
Hengyang
air quality
temporal characteristic
作者简介
黄一民(1980-),男,湖南汨罗人,副教授,博士,主要从事自然地理教学与研究。
