Earth System Science Data
Earth System Science Data
Earth System Science Data
Articles | Volume 18, issue 4
Articles | Volume 18, issue 4
https://doi.org/10.5194/essd-18-2749-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/essd-18-2749-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 18, issue 4
Data description article
 | 
21 Apr 2026
Data description article |  | 21 Apr 2026

Deriving regional and point source nitrogen oxides emissions in China from TROPOMI using the directional derivative approach with nonlinear chemical lifetime fitting

Ling Chen, Zhaonan Cai, Kang Sun, Yi Liu, Dongxu Yang, Mingming Li, and Lingyun Zhu

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Short summary
An appropriate representation of the NOx/NO2 ratio and NOx lifetime is essential for satellite-based NOx emissions estimation. We introduce a lightweight approach that applies variable NOx/NO2 ratios and piecewise fitting based on the directional derivative approach (DDA) to estimate regional and point-source NOx emissions. Our method directly captures nonlinear NOx chemistry and serves as an efficient alternative to both bottom-up inventories and computationally demanding top-down models.
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