The role of OCO-3 XCO<sub>2</sub> retrievals in estimating global terrestrial net ecosystem exchanges

Wang, Xingyu; Jiang, Fei; Wang, Hengmao; Zhang, Zhengqi; Wu, Mousong; Wang, Jun; He, Wei; Ju, Weimin; Chen, Jing M.

doi:https://doi.org/10.5194/acp-25-867-2025

Articles | Volume 25, issue 2

https://doi.org/10.5194/acp-25-867-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-25-867-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 25, issue 2

Research article

|

22 Jan 2025

Research article |

| 22 Jan 2025

The role of OCO-3 XCO₂ retrievals in estimating global terrestrial net ecosystem exchanges

Xingyu Wang, Fei Jiang, Hengmao Wang, Zhengqi Zhang, Mousong Wu, Jun Wang, Wei He, Weimin Ju, and Jing M. Chen

Supplement

https://doi.org/10.5194/acp-25-867-2025-supplement

Data sets

The role of OCO-3 XCO2 retrievals in estimating global terrestrial net ecosystem exchanges Xingyu Wang https://doi.org/10.5281/zenodo.11239535

Gridded fossil CO2 emissions and related O2 combustion consistent with national inventories (GCP-GridFEDv2023.1) M. W. Jones et al. https://doi.org/10.5281/zenodo.8386803

OCO-3 Level 2 bias-corrected XCO2 and other select fields from the full-physics retrieval aggregated as daily files, Retrospective processing v10.4r OCO-3 Science Team https://doi.org/10.5067/970BCC4DHH24

OCO-2 Level 2 bias-corrected XCO2 and other select fields from the full-physics retrieval aggregated as daily files, Retrospective processing V11.1r OCO-2 Science Team https://doi.org/10.5067/8E4VLCK16O6Q

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Short summary

The role of OCO-3 XCO₂ retrievals in estimating global terrestrial carbon fluxes is unclear. We investigate this by assimilating OCO-3 XCO₂ retrievals alone and in combination with OCO-2 XCO₂. The assimilation of OCO-3 XCO₂ alone underestimates global land sinks, mainly at high latitudes, due to the lack of observations beyond 52° S and 52° N, large variations in the number of data, and varying observation times, while the joint assimilation of OCO-2 and OCO-3 XCO₂ has the best performance.