Overlooked significance of iodic acid in new particle formation in the continental atmosphere,Proceedings of the National Academy of Sciences of the United States of America

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Overlooked significance of iodic acid in new particle formation in the continental atmosphere
Proceedings of the National Academy of Sciences of the United States of America ( IF 9.4 ) Pub Date : 2024-07-24 , DOI: 10.1073/pnas.2404595121
An Ning ₁ , Jiewen Shen _{2,

3} , Bin Zhao _{2,

3} , Shuxiao Wang _{2,

3} , Runlong Cai ₂ , Jingkun Jiang _{2,

3} , Chao Yan _{4,

5} , Xiao Fu ₆ , Yunhong Zhang ₁ , Jing Li ₁ , Daiwei Ouyang _{2,

3} , Yisheng Sun _{2,

3} , Alfonso Saiz-Lopez ₇ , Joseph S Francisco _{8,

9} , Xiuhui Zhang ₁

Affiliation

Key Laboratory of Cluster Science, Ministry of Education of China, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China.
Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Joint International Research Laboratory of Atmospheric and Earth System Science, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China.
Institute of Environment and Ecology, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China.
Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Blas Cabrera, Spanish National Research Council, Madrid 28006, Spain.
Department of Earth and Environmental Science, University of Pennsylvania, Philadelphia, PA 19104-6316.
Department of Chemistry, University of Pennsylvania, Philadelphia, PA 19104-6316.

New particle formation (NPF) substantially affects the global radiation balance and climate. Iodic acid (IA) is a key marine NPF driver that recently has also been detected inland. However, its impact on continental particle nucleation remains unclear. Here, we provide molecular-level evidence that IA greatly facilitates clustering of two typical land-based nucleating precursors: dimethylamine (DMA) and sulfuric acid (SA), thereby enhancing particle nucleation. Incorporating this mechanism into an atmospheric chemical transport model, we show that IA-induced enhancement could realize an increase of over 20% in the SA–DMA nucleation rate in iodine-rich regions of China. With declining anthropogenic pollution driven by carbon neutrality and clean air policies in China, IA could enhance nucleation rates by 1.5 to 50 times by 2060. Our results demonstrate the overlooked key role of IA in continental NPF nucleation and highlight the necessity for considering synergistic SA-IA-DMA nucleation in atmospheric modeling for correct representation of the climatic impacts of aerosols.

更新日期：2024-07-24

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