摘要
利用北京延庆野鸭湖湿地生态气象观测站2013年PM_(2.5)和PM_(10)连续观测资料,统计分析野鸭湖地区大气颗粒物的变化特征及气象影响因素。研究结果表明:野鸭湖观测站PM_(2.5)和PM_(10)年平均浓度分别为45.7μg/m3和80.2μg/m^3,超标率分别为17.8%和11.4%,以《环境空气质量标准》二级标准统计。PM_(2.5)和PM_(10)均在1月达到峰值,7月出现最低值。各季PM_(2.5)/PM_(10)值在37.8%～69.9%之间,春季以PM_(10)污染为主,冬季以PM_(2.5)为主。各季节PM_(2.5)和PM_(10)日变化中夏季出峰最早,冬季最晚,冬春季PM_(2.5)浓度为双峰型,夏秋季为单峰型;PM_(10)的日变化仅春季与PM_(2.5)略有不同,晚上峰值强度远大于早上。野鸭湖地区颗粒物污染受本地源和外来源的共同影响,东北气流易造成颗粒物积累,而西南气流有利于颗粒物稀释扩散。典型污染过程显示,持续的东北风控制、风速2.0 m/s左右、平均相对湿度在80.0%左右利于颗粒物浓度的增加;而偏西气流和较高温度、较低湿度能共同起到缓解污染的作用。
Statistic analysis was made of the characters of the mass concentrations and meteorological factors of PM_(2.5) and PM_(10) in Wild Duck Lake wetland ecological meteorological station,based on the observations during the period of 2013.The results showed that study phase annual mean concentrations of PM_(2.5) and PM_(10) were 45.7 μg/m3 and 80.2 μg/m^3. PM_(2.5) and PM_(10) exceeded the China National Ambient Air Quality Standard for ClassⅡ 17.8% and 11.4% respectively. The concentration of PM_(2.5) and PM_(10) were the highest in January, with the lowest value in July. Ratios of PM_(2.5) to PM_(10) in different seasons was37.8%~69.9%. In spring the mainly pollution was PM_(10) and the winter was mainly PM_(2.5). The diurnal variation peak of PM_(2.5) and PM_(10) were the earliest in the summer and the latest in winter. The diurnal variation of PM_(2.5) and PM_(10) showed two peaks in winter and spring, however, showed one peak in summer and fall. Diurnal variation of PM_(10) was a slightly different from in spring, the diurnal variation peak of PM_(10) intensity in the evening was a much higher than that in the morning.The pollutant of atmospheric particulates in Wild Duck Lake combined impact by local pollution and external pollution. When the station controlled by northeaster can cause more atmospheric particulates accumulation, however, the southwester has exactly the opposite. The typical contamination process suggested that constantly controlled by northeaster, wind speed of 2.00 m/s and relative humidity of 80.0% can lead to atmospheric particulates pollution, however, the southwester, warmer temperatures and lower relative humidity can play a role in alleviating pollution.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2017年第S2期222-228,共7页
Environmental Science & Technology
基金
北京市延庆区2016年优秀人才培养资助项目:2019年世园会和2022年冬奥会环境气象保障人才培养项目
