Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 20
Articles | Volume 26, issue 20
https://doi.org/10.5194/acp-26-15223-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-15223-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 20
Research article
 | 
29 Oct 2026
Research article |  | 29 Oct 2026

Evaluation of the GOSAT/GOSAT-2 XCO2 proxy XCH4 product by comparison with TCCON observations over China

Xinran Jiang, Gerrit de Leeuw, Cheng Fan, Jeon-Teo Dong, Andrew Gerald Barr, Wei Wang, Minqiang Zhou, and Zhengqiang Li

Data sets

Methane data from 2002 to present derived from satellite observations Copernicus Climate Change Service, Climate Data Store https://doi.org/10.24381/cds.b25419f8

TCCON data from Hefei (PRC), Release GGG2020.1.R1 (Version R1) C. Liu et al. https://doi.org/10.14291/tccon.ggg2020p1.hefei01.R1

SRON Scientific GOSAT-2 Level 2 Data Products for XCO2 and XCH4 (Version 2.2.0) SRON Netherlands Institute for Space Research https://doi.org/10.5281/zenodo.22637354

TCCON data from Xianghe, China, Release GGG2020.1.R0 (Version R0) M. Zhou et al. https://doi.org/10.14291/tccon.ggg2020p1.xianghe01.R0

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Short summary
Evaluation of satellite greenhouse gas data is crucial for climate monitoring and mitigation. We assessed four XCO2 Proxy XCH4 results using Hefei and Xianghe Total Carbon Column Observing Network (TCCON) sites in China. We found that the accuracy of retrieval products varies between both sites. Fundamental assumption of Proxy method leaves uncertainties. Independent XCO2 proxy comparison with TCCON data show discrepancies requiring continuous evaluation for proper determination of XCH4.
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