Liu Chuwei, Huang Zhongwei, Huang Jianping, Liang Chunsheng, Ding Lei, Lian Xinbo, Liu Xiaoyue, Zhang Li, Wang Danfeng
Collaborative Innovation Center for Western Ecological Safety (CIWES), College of Atmospheric Sciences, Lanzhou University, Lanzhou, 730000 China.
CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, 100101 China.
Adv Atmos Sci. 2022;39(6):861-875. doi: 10.1007/s00376-021-1281-x. Epub 2022 Mar 16.
Estimating the impacts on PM pollution and CO emissions by human activities in different urban regions is important for developing efficient policies. In early 2020, China implemented a lockdown policy to contain the spread of COVID-19, resulting in a significant reduction of human activities. This event presents a convenient opportunity to study the impact of human activities in the transportation and industrial sectors on air pollution. Here, we investigate the variations in air quality attributed to the COVID-19 lockdown policy in the megacities of China by combining in-situ environmental and meteorological datasets, the Suomi-NPP/VIIRS and the CO emissions from the Carbon Monitor project. Our study shows that PM concentrations in the spring of 2020 decreased by 41.87% in the Yangtze River Delta (YRD) and 43.30% in the Pearl River Delta (PRD), respectively, owing to the significant shutdown of traffic and manufacturing industries. However, PM concentrations in the Beijing-Tianjin-Hebei (BTH) region only decreased by 2.01% because the energy and steel industries were not fully paused. In addition, unfavorable weather conditions contributed to further increases in the PM concentration. Furthermore, CO concentrations were not significantly affected in China during the short-term emission reduction, despite a 19.52% reduction in CO emissions compared to the same period in 2019. Our results suggest that concerted efforts from different emission sectors and effective long-term emission reduction strategies are necessary to control air pollution and CO emissions.
评估不同城市地区人类活动对细颗粒物污染和一氧化碳排放的影响，对于制定有效政策至关重要。2020年初，中国实施了封锁政策以遏制新冠病毒的传播，导致人类活动大幅减少。这一事件为研究交通和工业部门的人类活动对空气污染的影响提供了便利契机。在此，我们通过结合现场环境和气象数据集、苏米国家极地轨道伙伴计划/可见光红外成像辐射仪以及碳监测项目的一氧化碳排放数据，调查了中国特大城市中因新冠疫情封锁政策导致的空气质量变化。我们的研究表明，由于交通和制造业的大幅停工，2020年春季长江三角洲地区的细颗粒物浓度分别下降了41.87%，珠江三角洲地区下降了43.30%。然而，京津冀地区的细颗粒物浓度仅下降了2.01%，因为能源和钢铁行业并未完全停工。此外，不利的天气条件导致细颗粒物浓度进一步上升。此外，尽管与2019年同期相比一氧化碳排放量减少了19.52%，但在短期减排期间，中国的一氧化碳浓度并未受到显著影响。我们的研究结果表明，不同排放部门共同努力并制定有效的长期减排战略对于控制空气污染和一氧化碳排放是必要的。
