论文摘要
To investigate the impacts of relative humidity（RH） on secondary organic aerosol（SOA） concentrations and chemical reactions, the carbonaceous aerosol components [i.e., organic carbon（OC） and element carbon（EC）] were quantified in daily PM2.5 samples collected at a background site in East China during summer 2015. Based on the method of EC-tracer, the concentration of secondary organic carbon（SOC） demonstrated an obvious negative relationship with RH higher than 60%. Moreover, the ratio of SOC/EC also exhibited obvious decreasing trends with increasing RH, indicating negative effects for chemical production of SOA under high RH conditions. Due to high RH,photochemistry was weakened, gaseous oxidant concentrations was lowered（e.g., significantly decreased O3 levels）,and the production rates of SOA were relatively low. On the other hand, because of more water uptake under higher RH conditions, the aerosol droplet acidity was reduced and enhancement of SOA formation by acidity was accordingly absent. In addition, high RH also plays an important role in changing viscosity of pre-existing aerosol coatings,which can affect reactive uptake yield of SOA. Overall, the results from this study imply that SOA production may be more associated with photochemical processes, while aqueous-phase chemistry is not very important for some SOA formation in a moist ambient environment. In the ambient atmosphere, oxidant concentrations, reaction rates,airborne species, etc., are highly variable. How do these factors affect SOA yields under given ambient environment warrants further detailed investigations.
论文目录
文章来源
类型: 期刊论文
作者: Linlin LIANG,Guenter ENGLING,Yuan CHENG,Xiaoye ZHANG,Junying SUN,Wanyun XU,Chang LIU,Gen ZHANG,Hui XU,Xuyan LIU,Qianli MA
来源: Journal of Meteorological Research 2019年05期
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 环境科学与资源利用
单位: State Key Laboratory of Severe Weather & Key Laboratory for Atmospheric Chemistry, Chinese Academy of Meteorological Sciences,China Meteorological Administration,State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex,Division of Atmospheric Sciences, Desert Research Institute,School of Environment, Harbin Institute of Technology,National Satellite Meteorological Center,China Meteorological Administration,Lin'an Regional Atmosphere Background Station
基金: Supported by the National Key Research and Development Program of China(2016YFC0202300 and 2017YFC0212803),Beijing Natural Science Foundation(8192055),State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex(SCAPC201701),Basic Research and Operation Funds of Chinese Academy of Meteorological Sciences(2015Y001 and2017Z011)
分类号: X513
页码: 905-913
总页数: 9
文件大小: 989K
下载量: 8
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