2020年为遏制COVID-19的传播而采取的措施包括限制人们的流动性和减少经济活动。日常生活中这些剧烈的变化，通过国家封锁强制执行，导致世界各地城市化地区人为二氧化碳排放量的突然减少。为了研究社会限制对当地CO2排放的影响，我们分析了通过涡流协方差技术从11个欧洲城市的13个站点测得的地区级CO2通量。数据跨越大流行前的几年，直到2020年10月(大流行在欧洲开始六个月后)。在全国封锁期间，所有地点的二氧化碳排放量都有所减少。这些减少的幅度在时间和空间上有所不同，从一个城市到另一个城市，以及同一城市的不同地区之间。我们发现,在第一次封锁期间，与往年同期相比，城市二氧化碳排放量减少了5%至87%，主要是由于流动性的限制。然而,由于在接下来的几个月中取消了限制，在大多数地点，排放量迅速回升至COVID之前的水平。
The measures taken to contain the spread of COVID-19 in 2020 included restrictions of people\'s mobility and reductions in economic activities. These drastic changes in daily life, enforced through national lockdowns, led to abrupt reductions of anthropogenic CO2 emissions in urbanized areas all over the world. To examine the effect of social restrictions on local emissions of CO2, we analysed district level CO2 fluxes measured by the eddy-covariance technique from 13 stations in 11 European cities. The data span several years before the pandemic until October 2020 (six months after the pandemic began in Europe). All sites showed a reduction in CO2 emissions during the national lockdowns. The magnitude of these reductions varies in time and space, from city to city as well as between different areas of the same city. We found that, during the first lockdowns, urban CO2 emissions were cut with respect to the same period in previous years by 5% to 87% across the analysed districts, mainly as a result of limitations on mobility. However, as the restrictions were lifted in the following months, emissions quickly rebounded to their pre-COVID levels in the majority of sites.
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