Revealing the sulfur dioxide emission reductions in China  by assimilating surface observations in WRF-Chem

Dai, Tie; Cheng, Yueming; Goto, Daisuke; Li, Yingruo; Tang, Xiao; Shi, Guangyu; Nakajima, Teruyuki

doi:https://doi.org/10.5194/acp-21-4357-2021

Articles | Volume 21, issue 6

https://doi.org/10.5194/acp-21-4357-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-21-4357-2021

© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 21, issue 6

Research article

|

22 Mar 2021

Research article |

| 22 Mar 2021

Revealing the sulfur dioxide emission reductions in China by assimilating surface observations in WRF-Chem

Tie Dai, Yueming Cheng, Daisuke Goto, Yingruo Li, Xiao Tang, Guangyu Shi, and Teruyuki Nakajima

Supplement

https://doi.org/10.5194/acp-21-4357-2021-supplement

Model code and software

LETKF source codes T. Miyoshi https://github.com/takemasa-miyoshi/letkf

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Short summary

The anthropogenic emission of sulfur dioxide (SO₂) over China has significantly declined as a consequence of the clean air actions. We have developed a new emission inversion system to dynamically update the SO₂ emission grid by grid over China by assimilating ground-based SO₂ observations. The inverted SO₂ emission over China in November 2016 on average had declined by 49.4 % since 2010, which is well in agreement with the bottom-up estimation of 48.0 %.