Spatiotemporal changes in global nitrogen dioxide emission due to COVID-19 mitigation policies

Spatiotemporal changes in global nitrogen dioxide emission due to COVID-19 mitigation policies
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DOI:
10.1016/j.scitotenv.2021.146027
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发表时间:
2021-02-22
期刊:
The Science of the Total Environment
影响因子:
--
通讯作者:
Yang C
Yang C
中科院分区:
其他
文献类型:
--
作者:
Liu Q;Malarvizhi AS;Liu W;Xu H;Harris JT;Yang J;Duffy DQ;Little MM;Sha D;Lan H;Yang C

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本文利用卫星观测资料,对中国、南非、巴西、印度、英国和美国6个国家在新冠肺炎疫情期间、封锁前后(以下简称封锁前、封锁中、封锁后)对流层二氧化氮垂直柱密度的时空变化进行了研究,并与2019年以及2010 - 2019年的平均气候学进行了比较。我们观察到,包括中国、南非、印度和英国在内的大多数研究国家(与10年气候学相比)从前期到中期的相对差异(rd)显著下降,分别下降了15%、17%、8%和7%。美国没有表现出明显的下降,研发差异相对较小,只有2%。与此同时,尽管巴西2020年的研发率比2010-2019年低7%,但这一趋势与2019年非常相似(20%对23%)。在2020年后,大多数目标国家(中国、美国、南非、巴西和英国)的二氧化氮柱出现反弹,与2019年和2010-2019年相比,相对于相应的前期,其rd相似。相比之下,印度的NO继续受到持续的COVID-19危机的影响,研发前至研发后的研发率比前10年的平均水平低8%。
This paper investigates spatiotemporal changes of nitrogen dioxide (NO2) tropospheric vertical column density due to the COVID-19 pandemic using satellite observations before, during and after the lockdown (hereafter referred as the pre-, peri- and post-periods) in six different countries: China, South Africa, Brazil, India, the UK and the US, and compare these periods with 2019 as well as mean climatology from 2010 to 2019. We observe significant declines in relative differences (RDs) from the pre- to peri-period (as compared with the 10-year climatology) in most study countries including China, South Africa, India, and the UK by 15, 17, 8 and 7% respectively. The US does not demonstrate significant decline with RD difference relatively small at just 2%. Meanwhile, although the 2020 RD of Brazil is 7% lower than 2010–2019, this trend is quite similar to that of 2019 (20% vs 23%). In the post-period of 2020, the NO2 columns rebound in most target countries: China, US, South Africa, Brazil and UK, with similar RDs relative to the corresponding pre-period as compared with 2019 and 2010–2019. In contrast, NO in India continues to be influenced by the ongoing COVID-19 crisis with pre-to-post RD 8% lower than the average of previous 10 years.
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