Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 21, issue 12
Articles | Volume 21, issue 12
https://doi.org/10.5194/acp-21-9545-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-21-9545-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 21, issue 12
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, Dylan B. A. Jones, Kimberly Strong, Martin Keller, Daven K. Henze, Robert J. Parker, Hartmut Boesch, Debra Wunch, Justus Notholt, Christof Petri, Thorsten Warneke, Ralf Sussmann, Matthias Schneider, Frank Hase, Rigel Kivi, Nicholas M. Deutscher, Voltaire A. Velazco, Kaley A. Walker, and Feng Deng

Data sets

Assessing 5 years of GOSAT Proxy XCH4 data and associated uncertainties (http://cci.esa.int/ghg) R. J. Parker, H. Boesch, K. Byckling, A. J. Webb, P. I. Palmer, L. Feng, P. Bergamaschi, F. Chevallier, J. Notholt, N. Deutscher, T. Warneke, F. Hase, R. Sussmann, S. Kawakami, R. Kivi, D. W. T. Griffith, and V. Velazco https://doi.org/10.5194/amt-8-4785-2015

2014 TCCON Data Archive Total Carbon Column Observing Network (TCCON) https://tccondata.org/2014

Atmospheric Methane Dry Air Mole Fractions from the NOAA ESRL Carbon Cycle Cooperative Global Air Sampling Network, 1983-2015 E. J. Dlugokencky, P. Lang, A. Crotwell, J. Mund, M. Crotwell, and K. Thoning ftp://aftp.cmdl.noaa.gov/data/trace_gases/ch4/flask/surface/

HIAPER Pole-to-Pole Observations (HIPPO): fine-grained, global-scale measurements of climatically important atmospheric gases and aerosols S. C. Wofsy, H. S. Team, C. Modellers, and S. Teams https://www.eol.ucar.edu/field_projects/hippo/

ACE-FTS version 3.0 data set: validation and data processing update (https://databace.scisat.ca/level2/ace_v3.5_v3.6/) C. Waymark, K. Walker, C. Boone, and P. Bernath https://doi.org/10.4401/ag-6339

Model code and software

Development of the adjoint of GEOS-Chem (http://wiki.seas.harvard.edu/geos-chem/index.php/GEOS-Chem_Adjoint) D. K. Henze, A. Hakami, and J. H. Seinfeld https://doi.org/10.5194/acp-7-2413-2007

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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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