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Atmospheric CH4 mole fraction (global)
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== Boundary Conditions == Boundary inclusions encompass methane concentrations measured in the free troposphere and boundary layer of the global atmosphere, integrating all latitudinal and longitudinal extents. Measurements include background atmospheric methane and contributions from natural and anthropogenic sources. Boundary exclusions involve methane concentrations confined to localized microenvironments such as indoor air, soil pore spaces, or aquatic systems. Additionally, methane present in non-atmospheric reservoirs (e.g., hydrates, geological deposits) is excluded from this atmospheric state signal.
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