期刊
GEOPHYSICAL RESEARCH LETTERS
卷 49, 期 9, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL097393
关键词
aerosol nitrate; long-term trend; N2O5 hydrolysis
资金
- National Science Foundation of China [92044301, 41875175, 41975154, 21806108]
- Science and Technology Commission of Shanghai Municipality Fund Project [20dz1204000]
- National Key R&D Program of China [2018YFC0213800]
- Shanghai Rising-Star Program [19QB1402900]
Aerosol nitrate has become the most abundant compound in aerosol pollution in eastern China. The response of nitrate to nitrogen oxide (NOx) reduction is still unclear despite the government's stringent policies. The study found that elevated dinitrogen pentoxide (N2O5) hydrolysis is responsible for the observed increase in nitrate.
Aerosol nitrate has become the most abundant compound during aerosol pollution in eastern China. The Chinese government implemented a stringent policy during 2013-2017 to tackle aerosol pollution. However, the response of nitrate to nitrogen oxides (NOx) reduction is unclear owing to the limitation of long-term measurement. Here, we performed a 9-year continuous measurement of aerosol compositions in Shanghai and confirmed a decrease in most species except nitrate. The contribution of nitrate to fine particulate matter (PM2.5) increased significantly, reaching up to 35% in pollution episodes after 2017. This is in contrast to the evident reduction in NOx emissions. We found that the elevated dinitrogen pentoxide (N2O5) hydrolysis is responsible for the observed nitrate trend. Increased ozone and decreased nitrogen dioxide (NO) facilitated the formation of N2O5, and increased nitrate proportion promoted the uptake of N2O5 and eventually enhanced the conversion efficiency of NO2 to nitrate. Our results highlight the importance of synergic control of aerosol and ozone pollution.
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