@Article{acp-22-13183-2022,
AUTHOR = {Hu, Y. and Zang, Z. and Ma, X. and Li, Y. and Liang, Y. and You, W. and Pan, X. and Li, Z.},
TITLE = {Four-dimensional variational assimilation for SO$_{2}$ emission and its
application around the COVID-19 lockdown in the spring 2020 over China},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {22},
YEAR = {2022},
NUMBER = {19},
PAGES = {13183--13200},
URL = {https://acp.copernicus.org/articles/22/13183/2022/},
DOI = {10.5194/acp-22-13183-2022}
}