[张贴报告]Spatial variations in molecular distributions and 13C isotopic compositions of diacids, oxoacids, and α-dicarbonyls in wintertime PM2.5 over Northeast Asia: Implications for sources and aging of organic aerosols

Spatial variations in molecular distributions and 13C isotopic compositions of diacids, oxoacids, and α-dicarbonyls in wintertime PM2.5 over Northeast Asia: Implications for sources and aging of organic aerosols
编号:3994 稿件编号:548 访问权限:私有 更新:2023-04-21 00:52:27 浏览:177次 张贴报告

报告开始:2023年05月06日 08:06 (Asia/Shanghai)

报告时间:1min

所在会议:[SP] 张贴报告专场 » [SP-14-1] 14、气溶胶与大气环境

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摘要
In order to investigate the spatial distributions and aging of dicarboxylic acids, oxocarboxylic acids and α-dicarbonyls in Northeast Asia, we collected fine aerosols (PM2.5) in Tianjin (TJ), northern China and in Padori (PD) and Daejoen (DJ), South Korea during winter 2019. We measured the molecular and compound-specific carbon isotopic composition (δ13C) of diacids, oxoacids and α-dicarbonyls in selected sets of the PM2.5 samples, covering a clean and a polluted periods during the campaign. Concentrations of diacids, oxoacids, and a-dicarbonyls were higher in polluted days than in clean days and were high in TJ followed by DJ and PD in the former case, whereas in DJ followed by TJ and PD in the latter case. Relative abundances of C9 in their total straight chain diacids (ΣC2–C12) mass in PM2.5 in DJ was significantly lower than that in TJ and PD. The correlations and mass ratios between selected species (and/or components), together with the δ13C of diacids and related compounds, revealed that the secondary formation of aerosols and their aging is dominant in PD and local anthropogenic emissions are dominant in TJ, while both of them are important in DJ.
 
关键字
Dicarboxylic acids; Stable carbon isotopic composition; sources; aging; PM2.5; Northeast Asia
报告人
赵晓麦
天津大学

稿件作者
PavuluriChandra Mouli 天津大学
赵晓麦 天津大学
董志超 天津大学
徐占杰 天津大学
JungJinsang Gas Metrology Group, Korea Research Institute of Standards and Science (KRISS), Daejeon 34113, Republic of Korea
NirmalkarJayant Department of Earth and Environmental Sciences, Jeonbuk National University, Jeonju, Republic of Korea
傅平青 天津大学
刘丛强 天津大学
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