Xu Liang, Zhang Jian, Sun Xin, Xu Shengchen, Shan Meng, Yuan Qi, Liu Lei, Du Zhenhong, Liu Dantong, Xu Da, Song Congbo, Liu Bowen, Lu Gongda, Shi Zongbo, Li Weijun
Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, Department of Atmospheric Sciences, School of Earth Sciences Zhejiang University Hangzhou China.
Zhejiang Ecological and Environmental Monitoring Center Hangzhou China.
Geophys Res Lett. 2020 Dec 16;47(23):e2020GL090444. doi: 10.1029/2020GL090444. Epub 2020 Nov 28.
Black carbon (BC) not only warms the atmosphere but also affects human health. The nationwide lockdown due to the Coronavirus Disease 2019 (COVID-19) pandemic led to a major reduction in human activity during the past 30 years. Here, the concentration of BC in the urban, urban-industry, suburb, and rural areas of a megacity Hangzhou were monitored using a multiwavelength Aethalometer to estimate the impact of the COVID-19 lockdown on BC emissions. The citywide BC decreased by 44% from 2.30 to 1.29 μg/m following the COVID-19 lockdown period. The source apportionment based on the Aethalometer model shows that vehicle emission reduction responded to BC decline in the urban area and biomass burning in rural areas around the megacity had a regional contribution of BC. We highlight that the emission controls of vehicles in urban areas and biomass burning in rural areas should be more efficient in reducing BC in the megacity Hangzhou.
黑碳（BC）不仅会使大气变暖，还会影响人类健康。2019年冠状病毒病（COVID-19）大流行导致的全国范围封锁使得过去30年里人类活动大幅减少。在此，利用多波长黑碳仪监测了特大城市杭州的城市、城市-工业、郊区和农村地区的黑碳浓度，以评估COVID-19封锁对黑碳排放的影响。在COVID-19封锁期之后，全市黑碳浓度从2.30微克/立方米降至1.29微克/立方米，降幅达44%。基于黑碳仪模型的源解析表明，城市地区车辆减排对黑碳浓度下降有响应，特大城市周边农村地区的生物质燃烧对黑碳有区域贡献。我们强调，在特大城市杭州，城市地区车辆排放控制和农村地区生物质燃烧控制对于减少黑碳应更具成效。
