First Chinese ultraviolet–visible hyperspectral satellite instrument implicating global air quality during the COVID-19 pandemic in early 2020

Cheng Liu; Qihou Hu; Chengxin Zhang; Congzi Xia; Hao Yin; Wenjing Su; Xiaohan Wang; Yizhou Xu; Zhiguo Zhang

doi:10.1038/s41377-022-00722-x

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First Chinese ultraviolet–visible hyperspectral satellite instrument implicating global air quality during the COVID-19 pandemic in early 2020

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- First Chinese ultraviolet–visible hyperspectral satellite instrument implicating global air quality during the COVID-19 pandemic in early 2020
- Light: Science & Applications Vol. 11, Issue 2, Pages: 242-253(2022)
- Affiliations：
  
  1.Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, 230026 Hefei, China
  2.Key Laboratory of Environmental Optics and Technology, Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, 230031 Hefei, China
  3.Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, 361021 Xiamen, China
  4.Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, University of Science and Technology of China, 230026 Hefei, China
  5.School of Earth and Space Sciences, University of Science and Technology of China, 230026 Hefei, China
  6.Department of Environmental Science and Engineering, University of Science and Technology of China, 230026 Hefei, China
- Author bio：
  
  Qihou Hu (qhhu@aiofm.ac.cn)
- Funds：
- DOI：10.1038/s41377-022-00722-x
  CLC：
- Published：28 February 2022，
  
  Published Online：02 February 2022，
  
  Received：24 August 2021，
  
  Revised：29 December 2021，
  
  Accepted：18 January 2022
- Accepted：
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Liu, C. et al. First Chinese ultraviolet–visible hyperspectral satellite instrument implicating global air quality during the COVID-19 pandemic in early 2020. Light: Science & Applications, 11, 242-253 (2022).
DOI：

Liu, C. et al. First Chinese ultraviolet–visible hyperspectral satellite instrument implicating global air quality during the COVID-19 pandemic in early 2020. Light: Science & Applications, 11, 242-253 (2022). DOI： 10.1038/s41377-022-00722-x.

摘要

Abstract

In response to the COVID-19 pandemic

governments worldwide imposed lockdown measures in early 2020

resulting in notable reductions in air pollutant emissions. The changes in air quality during the pandemic have been investigated in numerous studies via satellite observations. Nevertheless

no relevant research has been gathered using Chinese satellite instruments

because the poor spectral quality makes it extremely difficult to retrieve data from the spectra of the Environmental Trace Gases Monitoring Instrument (EMI)

the first Chinese satellite-based ultraviolet–visible spectrometer monitoring air pollutants. However

through a series of remote sensing algorithm optimizations from spectral calibration to retrieval

we successfully retrieved global gaseous pollutants

such as nitrogen dioxide (NO

)

sulfur dioxide (SO

)

and formaldehyde (HCHO)

from EMI during the pandemic. The abrupt drop in NO

successfully captured the time for each city when effective measures were implemented to prevent the spread of the pandemic

for example

in January 2020 in Chinese cities

February in Seoul

and March in Tokyo and various cities across Europe and America. Furthermore

significant decreases in HCHO in Wuhan

Shanghai

Guangzhou

and Seoul indicated that the majority of volatile organic compounds (VOCs) emissions were anthropogenic. Contrastingly

the lack of evident reduction in Beijing and New Delhi suggested dominant natural sources of VOCs. By comparing the relative variation of NO

to gross

domestic product (GDP)

we found that the COVID-19 pandemic had more influence on the secondary industry in China

while on the primary and tertiary industries in Korea and the countries across Europe and America.

关键词

Keywords

references

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