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Temporal variations in black carbon in the Yangtze River Delta of China: Long-term observations and trends under different pollution processes
Atmospheric Research ( IF 4.5 ) Pub Date : 2025-03-15 , DOI: 10.1016/j.atmosres.2025.108067
Jianhao Ren , Honglei Wang , Yue Tan , Wenjie Wang , Bin Zhu , Tianliang Zhao , Wen Lin , Duanyang Liu , Lijuan Shen , Shuangshuang Shi
Atmospheric Research ( IF 4.5 ) Pub Date : 2025-03-15 , DOI: 10.1016/j.atmosres.2025.108067
Jianhao Ren , Honglei Wang , Yue Tan , Wenjie Wang , Bin Zhu , Tianliang Zhao , Wen Lin , Duanyang Liu , Lijuan Shen , Shuangshuang Shi
As an important absorptive component of aerosols in the atmosphere, black carbon (BC) plays a key role in climatic processes. Continuous BC measurements in the atmosphere of Nanjing, China, were performed from 2015 to 2022. By combining data from PM2.5 , PM10 , SO2 , CO, NO2 , O3 and meteorological variables, the temporal variations in BC during different pollution events were determined in this study. The annual mean BC concentration increased from 2015 to 2018 (0.80 ± 0.05 μg/(m3 a)) and decreased from 2019 to 2022 (0.30 ± 0.001 μg/(m3 a)). The daily variations in BC concentrations during different processes (haze, dust, ozone, fireworks and fog) in Nanjing showed different characteristics. The BC concentration increased the most during haze events (50 %–100 %), while it changed little during fog events, so BC can be used to distinguish between these two processes. During O3 pollution events, the BC concentration increased by 6 %–44 %. During dust pollution events, BC concentration decreased owing to the high wind speed. Besides, BC wasn't a major pollutant originating from Nanjing fireworks. During haze and O3 pollution events, BC concentrations tended to increase (0.45 μg/m3 –1.51 μg/m3 ) as the pollution levels increase. It's worth noting that BC concentrations were higher in autumn (4.85 μg/m3 ) than other seasons during moderate haze events because of enhanced long-range BC transport. Furthermore, during O3 pollution events, high BC concentrations exacerbated BC-boundary layer (BL) interactions and sustained high O3 concentrations. Bimodal distribution of haze (O3 ) pollution at all levels, but the nocturnal BC concentration peak weakened during heavy haze events.
更新日期：2025-03-15
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