Composition and size distribution of wintertime inorganic aerosols at ground and alpine regions of northwest China  

作　　者：Haijiao Liu Qiao Feng Yu Huang Feng Wu Yali Liu Minxia Shen Xiao Guo Wenting Dai Weining Qi Yifan Zhang Lu Li Qiyuan Wang Bianhong Zhou Jianjun Li 

机构地区：[1]State Key Laboratory of Loess and Quaternary Geology,Key Lab of Aerosol Chemistry and Physics,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710061,China [2]Xi'an Institute for Innovative Earth Environment Research,Xi'an 710061,China [3]College of Geography and Environment,Baoji University of Arts and Sciences,Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation,Baoji 721013,China [4]National Observation and Research Station of Regional Ecological Environment Change and Comprehensive Management in the Guanzhong Plain,Shaanxi,Xi'an 710061,China

出　　处：《Chinese Chemical Letters》2024年第11期238-242,共5页中国化学快报（英文版）

基　　金：supported by the program from National Natural Science Foundation of China(Nos.42207555,41977332);Natural Science Basic Research Program of Shaanxi(Nos.2021JQ-971,2022JQ-242);Open Foundation of SKLLQG(No.SKLLQGZR2101);Strategic Priority Research Program of CAS(No.XDB40000000);the support of the Youth Innovation Promotion Association CAS(No.2020407)。

摘　　要：Water-soluble inorganic ions(WSIIs)play a pivotal role in atmospheric chemical reactions,particularly influencing the formation of secondary particulate matter.A comprehensive grasp of the vertical distribution of atmospheric pollutants holds immense significance in understanding the diffusion and transportation of these pollutants.This study investigates the WSIIs of PM_(2.5)and size-segregated particles at the top(~2060 m a.s.l.)and foot of Mt.Hua during the winter of 2020.All the measured ions present significant higher concentrations(1.9~6.9 times)at the foot than the top.Cl^(-)and K^(+)at the foot are more than 4 times of those at the top,whereas Ca^(2+)and Mg^(2+)are only 1.3-1.9 times higher.The particle size distribution of NO_(3)^(-),SO_(4)^(2-),K^(+)and Cl^(-)demonstrate a single peak distribution(0.7-1.1μm)at the foot,but with a bimodal distribution(0.7-1.1μm and 4.7-5.8μm)at the top.These differences suggest that the aerosol at the alpine region is mainly transported via long-distance from Northwest/North China,but limited influenced by vertical transport through valley breeze.The changes of concentration and size distribution of WSIIs in dust event and non-dust period indicate that the effects of dust event on aerosols at ground surface were weaker than that of the free troposphere of Guanzhong Plain.Notably,our study underscores the dominant influence of NO_(3)^(-)in shaping the gas-particle distribution of ammonia within the winter free troposphere.Our results highlight the significant role of long-range transport on aerosols in the free troposphere in Guanzhong Plain,Northwest China.

关 键 词：Water-soluble inorganic ions Size distribution Aerosol acidity AMMONIA Free troposphere 

分 类 号：X513[环境科学与工程—环境工程]