| Title: | Weakened Haze Mitigation Induced by Enhanced Aging of Black Carbon in China |
| Author(s): | Zhang Y; Zhang Q; Wu N; Ding A; |
| Address: | "Joint International Research Laboratory of Atmospheric and Earth System Sciences, School of Atmospheric Sciences, Nanjing University, Nanjing 210023, China. Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing 100084, China" |
| ISSN/ISBN: | 1520-5851 (Electronic) 0013-936X (Linking) |
| Abstract: | "A great challenge for haze pollution mitigation with the existing emission control measures in China is ozone (O(3)) increase. The chemical processes leading to weakened haze mitigation are still poorly understood. Our work identifies the enhanced aging chemistries of black carbon (BC) with increasing O(3) as an essential driver to weaken haze mitigation based on field observations during autumn/winter haze periods in 2014 and 2018 in North China Plain. The enhanced atmospheric oxidation capacity induced by increasing O(3) promotes the initial aging of accumulated fresh BC from continuous emission under haze pollution conditions and consequently improves the hygroscopicity of BC-containing particles to provide more particulate surfaces and volumes for aqueous and heterogeneous chemistries. The enhanced BC aging amplifies PM(2.5) concentrations by approximately 20%, which can be broken by concurrent reductions in multipollutant emissions (i.e., BC, nitrogen oxides, and volatile organic compounds), especially from residential and industrial sources. Moreover, enhanced BC aging implies an adverse effect of O(3) increase on climate change. Observationally enhanced BC aging will help to constrain estimations of the interactions among O(3) increase, haze pollution, and climate warming in recent years in China" |
| Keywords: | *Air Pollutants/analysis *Air Pollution/analysis Carbon China Environmental Monitoring Particulate Matter/analysis Soot Atmospheric aging Black carbon Haze pollution Ozone increase; |
| Notes: | "MedlineZhang, Yuxuan Zhang, Qiang Wu, Nana Ding, Aijun eng Research Support, Non-U.S. Gov't 2022/06/09 Environ Sci Technol. 2022 Jun 21; 56(12):7629-7636. doi: 10.1021/acs.est.2c00090. Epub 2022 Jun 8" |
