One-year observation of the mixing states of oxygenated organics-containing single particles in Guangzhou, China

被引：1

作者：

Mao, Liyuan ^{[1
,2
]}

Yang, Suxia ^{[3
]}

Cheng, Xiaoya ^{[1
,2
]}

Liu, Sulin ^{[1
,2
]}

Chen, Duanying ^{[1
,2
]}

Zhou, Zhen ^{[1
,2
]}

Li, Mei ^{[1
,2
]}

Pei, Chenglei ^{[4
]}

Cheng, Chunlei ^{[1
,2
,5
,6
]}

机构：

[1] Jinan Univ, Inst Mass Spectrometry & Atmospher Environm, Guangdong Prov Engn Res Ctr Online Source Apportio, Guangzhou 510632, Peoples R China

[2] Guangdong Hongkong Macau Joint Lab Collaborat Inno, Guangzhou 510632, Peoples R China

[3] Guangzhou Res Inst Environm Protect Co Ltd, Guangzhou 510620, Peoples R China

[4] Guangzhou Ecol & Environm Monitoring Ctr Guangdong, Guangzhou 510030, Peoples R China

[5] Hainan Univ, State Key Lab Marine Resource Utilizat South China, Haikou 570228, Peoples R China

[6] Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China

来源：

FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING | 2024年 / 18卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Oxygenated organics; Single particles; Mixing state; Secondary formation; Photochemistry; SECONDARY FORMATION; AEROSOL FORMATION; BLACK CARBON; RIVER DELTA; URBAN; INSIGHTS; ABSORPTION; EVOLUTION; OXIDATION; PM2.5;

D O I：

10.1007/s11783-024-1824-3

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Oxygenated organic molecules (OOMs) play an important role in the formation of secondary organic aerosols (SOAs), but the mixing states of OOMs are still unclear. This study investigates the mixing states of OOM-containing single particles from the measurements taken using a single particle aerosol mass spectrometer in Guangzhou, China in 2022. Generally, the particle counts of OOM particles and the mass concentration of secondary organic carbon (SOC) exhibited similar temporal trends throughout the entire year. The OOM particles were consistently enriched in secondary ions, including 16O-, 26CN-, 46NO2-, 62NO3-, and 97HSO4-. In contrast, the number fractions and diurnal patterns of OOM particles among the total detected particles showed similar distributions in August and October; however, the SOC ratios in fine particulate matter were quite different, suggesting that there were different mixing states of single-particle oxygenated organics. In addition, further classification results indicated that the OOM particles were more aged in October than August, even though the SOC ratios were higher in August. Furthermore, the distribution of hydrocarbon fragments exhibited a notable decrease from January to October, emphasizing the more aged state of the organics in October. In addition, the sharp increase in elemental carbon (EC)-OOM particles in the afternoon in October suggests the potential role of EC in the aging process of organics. Overall, in contrast to the bulk analysis of SOC mass concentration, the mixing states of the OOM particles provide insights into the formation process of SOAs in field studies.

引用

页数：15