摘要
甲醛(HCHO)是大气光化学重要污染物之一,为研究西南地区郊区大气夏季甲醛污染特征选取了四川省成都市新津区进行大气甲醛观测,结合NO_(x)、O_(3)、PAN、J⁃value、温湿度、风速风向、天气数据进行分析.观测期间成都市新津区夏季甲醛浓度为0.76×10^(-9)~12.50×10^(-9)(V/V),均值为3.47×10^(-9)±2.05×10^(-9)(V/V),呈现明显的日变化规律.结合数据分析可知,一次人为排放源在成都郊区夏季日间甲醛贡献中占比较低.观测期间甲醛受光照的影响较大,与O_(3)、PAN、J⁃value普遍呈现一致的变化规律,因此成都市夏季日间甲醛主要来源为甲醛前体物的二次光化学反应.
Formaldehyde(HCHO)is an important photochemical pollutant in atmosphere.A comprehensive field study for investigating the atmospheric behavior of HCHO was performed in Chengdu suburban in southwest China in summer 2019.HCHO was measured simultaneously with NO_(x),O_(3),PAN,and meteorological parameters(including photolysis frequencies,temperature,relative humidity,wind speed,and wind direction).The observed HCHO concentration ranged from 0.7×10^(-9)to 12.50×10^(-9)(V/V)with a mean value of 3.47×10^(-9)±2.05×10^(-9)(V/V),and shows clear diurnal variation.It is found that anthropogenic emissions have little contribution to the HCHO formation.In contrast,HCHO concentration was largely influenced by solar radiation,resulting in similar temporal variation as O_(3),PAN,and photolysis frequencies.This suggests that HCHO observed during summer time in Chengdu suburban is mainly originated from photochemical oxidations of its precursors.
作者
朱媛
陈仕意
曾立民
姜加龙
李歆
ZHU Yuan;CHEN Shiyi;ZENG Limin;JIANG Jialong;LI Xin(State Key Joint Laboratory of Environmental Simulation and Pollution Control,College of Environmental Sciences and Engineering,Peking University,Beijing 100871;School of Environment and Energy,Peking University Shenzhen Graduate School,Shenzhen 518055;Beijing SDL Technology Co.,Ltd.,Beijing 102206)
出处
《环境科学学报》
CAS
CSCD
北大核心
2021年第11期4331-4340,共10页
Acta Scientiae Circumstantiae
基金
国家重点研发计划(No.2017YFC0209400,2018YFC0213501)
国家自然科学基金资助项目(No.91644108,91844301)。
关键词
甲醛
光化学反应
成都郊区
formaldehyde
photochemical oxidation
Chengdu
