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

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

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

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.
Final-revised paper