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Increased Aerosol Extinction Efficiency Hinders Visibility Improvement in Eastern China
Author(s) -
Liu Jingyi,
Ren Chuanhua,
Huang Xin,
Nie Wei,
Wang Jiaping,
Sun Peng,
Chi Xuguang,
Ding Aijun
Publication year - 2020
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2020gl090167
Subject(s) - aerosol , haze , visibility , environmental science , atmospheric sciences , extinction (optical mineralogy) , relative humidity , particulates , pollution , mass concentration (chemistry) , nitrate , satellite , meteorology , climatology , chemistry , mineralogy , geography , physics , geology , ecology , organic chemistry , astronomy , biology
Though China has witnessed substantial particular matter pollution mitigation owing to the strict emission control in recent years, the frequency of haze events with low visibility is not improved as much as expected, especially in cold seasons. Here, 6‐year wintertime observations, satellite retrievals, a thermodynamic model, and theoretical calculation were integrated to better understand the complex influence of aerosol chemical composition and hygroscopic behaviors on visibility impairment. We found that the proportion of nitrate in aerosol mass concentration increased by approximately 10% from 2013 to 2018. Such a transition in aerosol chemical compositions together with increasing ambient humidity in past years jointly enhanced aerosol extinction efficiency, and the elevated proportion of nitrate played an increasingly critical role after 2017. The increased aerosol extinction efficiency is responsible for the less improved visibility despite large decrease in aerosol mass concentrations in eastern China.