02 Nov 2022
02 Nov 2022
Status: this preprint is currently under review for the journal ACP.

Seasonal variation of aerosol iron solubility in coarse and fine particles at an inland city in northwestern China

Huanhuan Zhang1,2, Rui Li1, Chengpeng Huang3, Xiaofei Li4, Shuwei Dong1, Fu Wang3, Tingting Li1, Yizhu Chen1, Guohua Zhang1, Yan Ren3, Qingcai Chen4, Ru-jin Huang5, Siyu Chen6, Tao Xue7, Xinming Wang1, and Mingjin Tang1,2 Huanhuan Zhang et al.
  • 1State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou, China
  • 2College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, China
  • 3Longhua Center for Disease Control and Prevention of Shenzhen, Shenzhen, China
  • 4School of Environmental Science and Engineering, Shaanxi University of Science and Technology, Xi'an, China
  • 5State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China
  • 6College of Atmospheric Sciences, Lanzhou University, Lanzhou, China
  • 7School of Public Health, Peking University, Beijing, China

Abstract. This work investigated seasonal variation of aerosol iron (Fe) solubility for coarse (>1 μm) and fine (<1 μm) particles at Xi’an, a megacity in northwestern China impacted by anthropogenic emission and desert dust. Total Fe concentrations were lowest in summer and similar in other seasons for coarse particles, while lowest in summer and highest in spring for fine particles; for comparison, dissolved Fe concentrations were higher in autumn and winter than spring and summer for coarse particles, while highest in winter and lowest in spring and summer for fine particles. Desert dust aerosol was always the major source of total Fe for both coarse and fine particles in all the four seasons, but it may not be the dominant source for dissolved Fe. Fe solubility was lowest in spring for both coarse and fine particles, and highest in winter for coarse particles and in autumn for fine particles. In general aerosol Fe solubility was found to be higher in air masses originating from local and nearby regions than those arriving from desert regions after long-distance transport. Compared to coarse particles, Fe solubility was similar for fine particles in spring but significantly higher in the other three seasons, and at a given aerosol pH range Fe solubility was always higher in fine particles. Aerosol Fe solubility was well correlated with relative abundance of aerosol acidic species, implying aerosol Fe solubility enhancement by acid processing; moreover, such correlations were better for coarse particles than fine particles in all the four seasons. Fe solubility was found to increase with relative humidity and acid acidity for both coarse and fine particles at Xi’an, underscoring the importance of aerosol liquid water and aerosol acidity in regulating Fe solubility via chemical processing.

Huanhuan Zhang et al.

Status: open (until 14 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-725', Anonymous Referee #1, 20 Nov 2022 reply
  • RC2: 'Comment on acp-2022-725', Anonymous Referee #2, 23 Nov 2022 reply

Huanhuan Zhang et al.

Huanhuan Zhang et al.


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Short summary
This work investigated seasonal variation of aerosol Fe solubility for coarse and fine particles in Xi’an, a megacity severely in northwestern China affected by anthropogenic emission and desert dust aerosol. In addition, we discussed in-depth what controlled aerosol Fe solubility at different seasons for coarse and fine particles.