摘要
为探究华北地区大气甲醛的污染特征,应用自主设计的一套大气甲醛在线分析仪,于2017年冬季和2018年夏季在山东省德州市开展大气甲醛综合观测实验.结果表明,德州站冬季和夏季大气甲醛小时浓度范围分别为0.15×10^-9~9.89×10^-9和0.43×10^-9~10.42×10^-9,平均值分别为(3.04±1.70)×10^-9和(4.32±2.06)×10^-9,结合日变化特征可知,白天甲醛、过氧乙酰基硝酸酯(PAN)和臭氧(O3)具有较好的一致性,表明光化学生成是甲醛的主要来源;冬季夜间检测出的高浓度甲醛则表明一次排放也具有重要的贡献.此外,大气甲醛的浓度变化受相对湿度、光照、风速和湿沉降影响较大,并且湿沉降是大气甲醛去除的重要途径.
To analyze the variability of atmospheric formaldehyde in North China, an online formaldehyde analyzer was used in two field campaigns in winter 2017 and summer 2018 at Dezhou, Shandong Province. The hourly mixing ratios of formaldehyde range from 0.15×10^-9 to 9.89×10^-9 in wintertime and 0.43×10^-9 ~10.42×10^-9 in summertime. The average mixing ratios are (3.04±1.70)×10^-9 and (4.32±2.06)×10^-9 during winter and summer, respectively. Agreement in trends of formaldehyde, ozone and PAN in daytime indicates that photochemical production is the major source of formaldehyde;during nighttime in winter, elevated level of formaldehyde is observed, indicating the contribution from local primary emissions. The diurnal variation pattern of formaldehyde is also affected by relative humidity, radiation, wind speed and wet deposition, among which wet deposition is found to be the major sink of formaldehyde during the observation.
作者
姜加龙
曾立民
王文杰
陈仕意
李歆
JIANG Jialong;ZENG Limin;WANG Wenjie;CHEN Shiyi;LI Xin(State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871;Beijing SDL Technology Co., Ltd., Beijing 102206;Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science & Technology, Nanjing 210044)
出处
《环境科学学报》
CAS
CSCD
北大核心
2019年第6期1895-1901,共7页
Acta Scientiae Circumstantiae
基金
大气重污染成因与治理攻关项目(No.DQGG0102)
国家科技支撑计划项目(No.2014BAC21B01)
关键词
甲醛
华北地区
光化学
湿沉降
formaldehyde
North China
photochemistry
wet deposition
