Yang Du, Hanxiong Che, Zier Bao, Yiliang Liu, Qing Li, Miao Hu, Jiawei Zhou, Shumin Zhang, Xiaojiang Yao, Quan Shi, Chunmao Chen, Yan Han, Lingshuo Meng, Xin Long, Xin Qi, Chen He, Yang Chen
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引用次数: 0
摘要
超高分辨率质谱法用于研究气溶胶有机硝酸盐（ONs）的特征。气溶胶有机硝酸盐（ONs）具有高分子量（HMW）、高不饱和度和高官能度的特点。在空气污染严重的情况下，由脂肪族和芳香族化合物组成的 N1Ox 类 ONs 的数量随着氧化程度的提高而增加。在白天，高不饱和脂肪族 ONs 不断产生。在夜间，大气中 NO3 自由基的氧化促进了 ON 的产生。N2Ox 类 ONs 主要由多代氧化的高不饱和脂肪族化合物组成。大多数 N2Ox-ONs 来自烹饪。生物质燃烧也对氡气的形成起到了不可磨灭的作用。在白天，大气的光降解作用导致高分子量氯化萘，特别是脂肪族氯化萘被去除。在夜间，NO3 氧化自由基抑制了氡的生成，尤其是人为氡。这项研究加深了人们对持续减缓可吸入颗粒物需求下的高分子量氯化萘的来源、形成和演变的理解。
Evolution of atmospheric high-molecular-weight Organonitrates (HMW ONs) in urban Yangtze River Delta (YRD), China
Ultra-high-resolution mass spectrometry was used to investigate the characterization of aerosol organonitrates (ONs). ONs featured high-molecular-weight (HMW), high unsaturation, and high functionalization. Under high air pollution events, the number of N1Ox class ONs composed of aliphatic and aromatic compounds increased with high levels of oxidation. In the daytime, highly unsaturated aliphatic-ONs were continuously produced. In the nighttime, the atmospheric oxidation of NO3 radicals promoted ONs. N2Ox class ONs were mainly comprised of multi-generation oxidated aliphatic compounds with high unsaturation. Most of the N2Ox-ONs were from cooking. Biomass burning also played an indelible role in the formation of ONs. In the daytime, atmospheric photodegradation led to the removal of the HMW ONs, especially aliphatic ONs. During nighttime, the NO3 oxidation radicals inhibited the generation of ONs, especially anthropogenic ONs. This study improves the understanding of the source, formation, and evolution of HMW ONs under the demand for continuous PM mitigation.
期刊介绍：
npj Climate and Atmospheric Science is an open-access journal encompassing the relevant physical, chemical, and biological aspects of atmospheric and climate science. The journal places particular emphasis on regional studies that unveil new insights into specific localities, including examinations of local atmospheric composition, such as aerosols.
The range of topics covered by the journal includes climate dynamics, climate variability, weather and climate prediction, climate change, ocean dynamics, weather extremes, air pollution, atmospheric chemistry (including aerosols), the hydrological cycle, and atmosphere–ocean and atmosphere–land interactions. The journal welcomes studies employing a diverse array of methods, including numerical and statistical modeling, the development and application of in situ observational techniques, remote sensing, and the development or evaluation of new reanalyses.
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