摘要
利用2006—2015年杭州环境空气质量及霾等观测数据,分析近几年杭州的霾日数变化,比较霾与非霾两种情况下污染物浓度和气溶胶消光特性的差异。结果表明:杭州霾出现频繁,近10年来年均霾日数在160 d左右,频率高达40%以上。每月PM2.5超标天数与霾日数有较好吻合。随主要污染物浓度升高,能见度呈下降趋势。绝大多数月份均存在霾天气下污染物浓度高于非霾,霾天气下PM2.5的早晚高峰日变化特征更加明显。能见度的日变化呈现双谷特征。
Using the observation data of ambient air quality and haze from 2006 to 2015 in Hangzhou,the changes of hazy days in recent years was analyzed. The pollutant concentration and extinction properties were compared between hazy and no hazy weather. The results showed that the haze phenomena in Hangzhou appeared frequently. The annual average of hazy days were about 160 days during the last 10 years,and its frequency was over40%. The monthly days of PM_(2.5) which exceeded the control limit were consistent with hazy days. With the increase of the major pollutants,the visibility reduced. The concentration of pollutants in hazy weather were higher than that in no hazy weather. The daily variation characteristics of PM_(2.5) in hazy weather became more obvious during morning and evening rush hours. The daily variation of visibility presented a double-valley characteristics.
出处
《环境监测管理与技术》
CSCD
2017年第6期31-35,共5页
The Administration and Technique of Environmental Monitoring
基金
杭州市重大科技创新基金资助项目(20131813A03)
关键词
霾日
大气污染状况
消光特性
能见度
杭州
Hazy day
Atmospheric pollution
Extinction property
Visibility
Hangzhou
