Significant contribution of carbonyls to atmospheric oxidation capacity(AOC)during the winter haze pollution over North China Plain  

作　　者：Xue Yang Gen Zhang Guang Pan Guolan Fan Houyong Zhang Xuan Ge Mingyue Du 

机构地区：[1]School of Municipal and Environmental Engineering,Shandong Jianzhu University,Ji’nan 250101,China [2]State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry of China Meteorological Administration,Chinese Academy of Meteorological Sciences,Beijing 100081,China [3]Shandong Jinan Ecological Environment Monitoring Center,Ji’nan 250101,China

出　　处：《Journal of Environmental Sciences》2024年第5期377-388,共12页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.42005092,42275127,42075112and 41775127);the Natural Science Foundation of Shandong Province(No.ZR2020QD058)。

摘　　要：Atmospheric carbonyl compounds play significant roles in the cycling of radicals and have exhibited surprisingly high levels in winter that were well correlated to particulate matter,for which the reason have not been clearly elucidated.Here we measured carbonyl compounds and other trace gasses together with PM_(2.5)over urban Jinan in North China Plain during the winter.Markedly higher carbonyl concentrations(average:14.63±4.21 ppbv)were found during wintertime haze pollution,about one to three-times relative to those on nonhaze days,with slight difference in chemical composition except formaldehyde(HCHO).HCHO(3.68 ppbv),acetone(3.17 ppbv),and acetaldehyde(CH_3CHO)(2.83 ppbv)were the three most abundant species,accounting for~75% of the total carbonylson both haze and non-haze days.Results from observational-based model(OBM)with atmospheric oxidation capacity(AOC)indicated that AOC significantly increased with the increasing carbonyls during the winter haze events.Carbonyl photolysis have supplied key oxidants such as RO_(2) and HO_(2),and thereby enhancing the formation of fine particles and secondary organic aerosols,elucidating the observed haze-carbonyls inter-correlation.Diurnal variation with carbonyls exhibiting peak values at early-noon and night highlighted the combined contribution of both secondary formation and primary diesel-fuel sources.1-butene was further confirmed to be the major precursor for HCHO.This study confirms the great contribution of carbonyls to AOC,and also suggests that reducing the emissions of carbonyls would be an effective way to mitigate haze pollution in urban area of the NCP region.

关 键 词：CARBONYLS HAZE Observation-based model Source apportionment Atmospheric oxidation capacity 

分 类 号：X513[环境科学与工程—环境工程]