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

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

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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 distri-bution of atmospheric pollutants holds immense significance in understanding the diffusion and trans-portation of these pollutants.This study investigates the WSIIs of PM2.5 and size-segregated particles at the top(～2060m 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 Ca2+and Mg2+are only 1.3-1.9 times higher.The particle size distribution of NO3-,SO42-,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 dis-tribution 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 NO3-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.

Water-soluble inorganic ionsSize distributionAerosol acidityAmmoniaFree troposphere

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

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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

Xi'an Institute for Innovative Earth Environment Research,Xi'an 710061,China

College of Geography and Environment,Baoji University of Arts and Sciences,Shaanxi Key Laboratory of Disaster Monitoring and Mechanism Simulation,Baoji 721013,China

National Observation and Research Station of Regional Ecological Environment Change and Comprehensive Management in the Guanzhong Plain,Shaanxi,Xi'an 710061,China

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2024

10.1016/j.cclet.2024.109636

中国化学快报(英文版)
中国化学会

中国化学快报(英文版)

CSTPCD
影响因子：0.771
ISSN：1001-8417
年,卷(期)：2024.35(11)