Articles | Volume 21, issue 12
Atmos. Chem. Phys., 21, 9545–9572, 2021
https://doi.org/10.5194/acp-21-9545-2021
Atmos. Chem. Phys., 21, 9545–9572, 2021
https://doi.org/10.5194/acp-21-9545-2021

Research article 24 Jun 2021

Research article | 24 Jun 2021

Characterizing model errors in chemical transport modeling of methane: using GOSAT XCH4 data with weak-constraint four-dimensional variational data assimilation

Ilya Stanevich et al.

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Latest update: 23 Oct 2021
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Short summary
We explore the utility of a weak-constraint (WC) four-dimensional variational (4D-Var) data assimilation scheme for mitigating systematic errors in methane simulation in the GEOS-Chem model. We use data from the Greenhouse Gases Observing Satellite (GOSAT) and show that, compared to the traditional 4D-Var approach, the WC scheme improves the agreement between the model and independent observations. We find that the WC corrections to the model provide insight into the source of the errors.
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