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

作　　者：Liyuan Mao Suxia Yang Xiaoya Cheng Sulin Liu Duanying Chen Zhen Zhou Mei Li Chenglei Pei Chunlei Cheng 

机构地区：[1]Institute of Mass Spectrometry and Atmospheric Environment,Guangdong Provincial Engineering Research Center for the On-line Source Apportionment System of Air Pollution,Jinan University,Guangzhou,510632,China [2]Guangdong-Hongkong-Macao Joint Laboratory of Collaborative Innovation for Environmental Quality,Guangzhou,510632,China [3]Guangzhou Research Institute of Environment Protection Co.,Ltd.,Guangzhou,510620,China [4]Guangzhou Ecological and Environmental Monitoring Center of Guangdong Province,Guangzhou,510030,China [5]State Key Laboratory of Marine Resource Utilization in South China Sea,Hainan University,Haikou,570228,China [6]State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy Sciences,Xi’an,710061,China

出　　处：《Frontiers of Environmental Science & Engineering》2024年第5期155-169,共15页环境科学与工程前沿（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41827804 and 41805093);the Natural Science Foundation of Guangdong Province(China)(No.2021A1515011206);the State Key Laboratory of Marine Resource Utilization in the South China Sea,Hainan University(China)(No.MRUKF2023009);the State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,CAS(No.SKLLQG2218).

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 ^(16)O^(−),^(26)CN^(−),^(46)NO_(2)^(−),^(62)NO_(3)^(−),and ^(97)HSO_(4)^(−).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.

关 键 词：Oxygenated organics Single particles Mixing state Secondary formation PHOTOCHEMISTRY 

分 类 号：X513[环境科学与工程—环境工程]