Yangtze River Delta Aerosol liquid water in PM_(2.5)and its roles in secondary aerosol formation at a regional site of Yangtze River Delta  

作　　者：Ruifang Shi Fei Zhang Yemin Shen Jiasi Shen Bingye Xu Binyu Kuang Zhengning Xu Lingling Jin Qian Tang Xudong Tian Zhibin Wang 

机构地区：[1]College of Environmental and Resource Sciences,Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control,Zhejiang University,Hangzhou 310058,China [2]ZJU-Hangzhou Global Scientific and Technological Innovation Center,Zhejiang University,Hangzhou 311215,China [3]Zhejiang Ecological and Environmental Monitoring Center,Hangzhou 310012,China

出　　处：《Journal of Environmental Sciences》2024年第4期684-696,共13页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.91844301 and 42005087);the support from State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex,Shanghai Academy of Environment Sciences(No.CX2020080581)。

摘　　要：Aerosol liquid water content(ALWC)plays an important role in secondary aerosol formation.In this study,a whole year field campaign was conducted at Shanxi in north Zhejiang Province during 2021.ALWC estimated by ISORROPIA-Ⅱ was then investigated to explore its characteristics and relationship with secondary aerosols.ALWC exhibited a highest value in spring(66.38μg/m^(3)),followed by winter(45.08μg/m^(3)),summer(41.64μg/m^(3)),and autumn(35.01μg/m^(3)),respectively.It was supposed that the secondary inorganic aerosols(SIA)were facilitated under higher ALWC conditions(RH>80%),while the secondary organic species tended to form under lower ALWC levels.Higher RH(>80%)promoted the NO_(3)^(-)formation via gas-particle partitioning,while SO_(4)^(2-)was generated at a relative lower RH(>50%).The ALWC was more sensitive to NO_(3)^(-)(R=0.94)than SO_(4)^(2-)(R=0.90).Thus,the self-amplifying processes between the ALWC and SIA enhanced the particle mass growth.The sensitivity of ALWC and OX(NO_(2)+O_(3))to secondary organic carbon(SOC)varied in different seasons at Shanxi,more sensitive to aqueous-phase reactions(daytime R=0.84;nighttime R=0.54)than photochemical oxidation(daytime R=0.23;nighttime R=0.41)in wintertime with a high level of OX(daytime:130-140μg/m^(3);nighttime:100-140μg/m^(3)).The self-amplifying process of ALWC and SIA and the aqueous-phase formation of SOC will enhance aerosol formation,contributing to air pollution and reduction of visibility.

关 键 词：Aerosol liquid water content NITRATE SULFATE Secondary organic compounds Aqueous-phase reaction 

分 类 号：X513[环境科学与工程—环境工程]