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  Enhanced aerosol particle growth sustained by high continental chlorine emission in India

Gunthe, S. S., Liu, P., Panda, U., Raj, S. S., Sharma, A., Darbyshire, E., et al. (2021). Enhanced aerosol particle growth sustained by high continental chlorine emission in India. Nature Geoscience, 14, 77-84. doi:10.1038/s41561-020-00677-x.

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 Creators:
Gunthe, Sachin S.1, Author
Liu, Pengfei1, Author
Panda, Upasana1, Author
Raj, Subha S.1, Author
Sharma, Amit1, Author
Darbyshire, Eoghan1, Author
Reyes-Villegas, Ernesto1, Author
Allan, James1, Author
Chen, Ying1, Author
Wang, Xuan1, Author
Song, Shaojie1, Author
Pöhlker, Mira L.2, Author              
Shi, Liuhua1, Author
Wang, Yu1, Author
Kommula, Snehitha M.1, Author
Liu, Tianjia1, Author
Ravikrishna, R.1, Author
McFiggans, Gordon1, Author
Mickley, Loretta J.1, Author
Martin, Scot T.1, Author
Pöschl, Ulrich2, Author              Andreae, Meinrat O.2, Author              Coe, Hugh1, Author more..
Affiliations:
1external, ou_persistent22              
2Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              

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 Abstract: Many cities in India experience severe deterioration of air quality in winter. Particulate matter is a key atmospheric pollutant that impacts millions of people. In particular, the high mass concentration of particulate matter reduces visibility, which has severely damaged the economy and endangered human lives. But the underlying chemical mechanisms and physical processes responsible for initiating haze and fog formation remain poorly understood. Here we present the measurement results of chemical composition of particulate matter in Delhi and Chennai. We find persistently high chloride in Delhi and episodically high chloride in Chennai. These measurements, combined with thermodynamic modelling, suggest that in the presence of excess ammonia in Delhi, high local emission of hydrochloric acid partitions into aerosol water. The highly water-absorbing and soluble chloride in the aqueous phase substantially enhances aerosol water uptake through co-condensation, which sustains particle growth, leading to haze and fog formation. We therefore suggest that the high local concentration of gas-phase hydrochloric acid, possibly emitted from plastic-contained waste burning and industry, causes some 50% of the reduced visibility. Our work implies that identifying and regulating gaseous hydrochloric acid emissions could be critical to improve visibility and human health in India.

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Language(s): eng - English
 Dates: 2021-01-25
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
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Title: Nature Geoscience
  Abbreviation : Nat. Geosci.
Source Genre: Journal
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Publ. Info: London : Nature Publishing Group
Pages: - Volume / Issue: 14 Sequence Number: - Start / End Page: 77 - 84 Identifier: ISSN: 1752-0894
CoNE: https://pure.mpg.de/cone/journals/resource/1752-0894