Retrieving tropospheric NO2 vertical column densities around the city of Beijing and estimating NOx emissions based on car MAX-DOAS measurements

Cheng, Xinghong; Ma, Jianzhong; Jin, Junli; Guo, Junrang; Liu, Yuelin; Peng, Jida; Ma, Xiaodan; Qian, Minglong; Xia, Qiang; Yan, Peng

doi:https://doi.org/10.5194/acp-20-10757-2020

Articles | Volume 20, issue 17

https://doi.org/10.5194/acp-20-10757-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-20-10757-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 20, issue 17

Research article

|

14 Sep 2020

Research article |

| 14 Sep 2020

Retrieving tropospheric NO₂ vertical column densities around the city of Beijing and estimating NO_x emissions based on car MAX-DOAS measurements

Xinghong Cheng, Jianzhong Ma, Junli Jin, Junrang Guo, Yuelin Liu, Jida Peng, Xiaodan Ma, Minglong Qian, Qiang Xia, and Peng Yan

Supplement

https://doi.org/10.5194/acp-20-10757-2020-supplement

Data sets

National Center for Atmospheric Research, NCEP FNL Operational Model Global Tropospheric Analyses data Research Data Archive https://doi.org/10.5065/D6M043C6

ERA Interim data European Centre for Medium-Range Weather Forecasts https://apps.ecmwf.int/datasets/data/interim-full-daily/levtype=sfc

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Short summary

We carried out 19 city-circle-around Car MAX-DOAS experiments on the 6th Ring Road of Beijing in Jan, Sep, and Oct 2014. The tropospheric VCDs of NO₂ are retrieved and their temporal and spatial distributions are investigated. Then the NO_x emission rates in urban Beijing are estimated using the measured NO₂ VCDs together with the refined wind fields, NO₂-to-NO_x ratios, and NO₂ lifetimes simulated by the LAPS-WRF-CMAQ model system, and results are compared with the MEIC inventory in 2012.