How do Cl concentrations matter for the simulation of CH4 and δ13C(CH4) and estimation of the CH4 budget through atmospheric inversions?

Thanwerdas, Joël; Saunois, Marielle; Pison, Isabelle; Hauglustaine, Didier; Berchet, Antoine; Baier, Bianca; Sweeney, Colm; Bousquet, Philippe

doi:https://doi.org/10.5194/acp-22-15489-2022

Articles | Volume 22, issue 23

https://doi.org/10.5194/acp-22-15489-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-22-15489-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 23

Research article

|

08 Dec 2022

Research article |

| 08 Dec 2022

How do Cl concentrations matter for the simulation of CH₄ and δ¹³C(CH₄) and estimation of the CH₄ budget through atmospheric inversions?

Joël Thanwerdas, Marielle Saunois, Isabelle Pison, Didier Hauglustaine, Antoine Berchet, Bianca Baier, Colm Sweeney, and Philippe Bousquet

Supplement

https://doi.org/10.5194/acp-22-15489-2022-supplement

Data sets

NOAA AirCore atmospheric sampling system profiles (Version 20210813) B. Baier, C. Sweeney, P. Tans, T. Newberger, J. Higgs, S. Wolter, and NOAA Global Monitoring Laboratory https://doi.org/10.15138/6AV0-MY81

Atmospheric Methane Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 1983-2021 X. Lan, E. J. Dlugokencky, J. W. Mund, A. M. Crotwell, M. J. Crotwell, E. Moglia, M. Madronich, D. Neff and K. W. Thoning https://doi.org/10.15138/VNCZ-M766

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Short summary

Atmospheric methane (CH₄) concentrations have been rising since 2007, resulting from an imbalance between CH₄ sources and sinks. The CH₄ budget is generally estimated through top-down approaches using CH₄ and δ¹³C(CH₄) observations as constraints. The oxidation by chlorine (Cl) contributes little to the total oxidation of CH₄ but strongly influences δ¹³C(CH₄). Here, we compare multiple recent Cl fields and quantify the influence of Cl concentrations on CH₄, δ¹³C(CH₄), and CH₄ budget estimates.