Editing Atmospheric Carbon Dioxide Mole Fraction (Global Mean) (section)

== Boundary Conditions ==
Boundary inclusions for this signal comprise all measurements contributing to the globally averaged atmospheric CO2 mole fraction under the referenced observing-system and averaging conventions. This includes data from surface monitoring stations, flask samples, and integrated measurement networks that conform to standardized protocols.

Boundary exclusions are local or regional CO2 concentration measurements that do not conform to the global-mean averaging convention. The signal excludes CO2-equivalent aggregations that combine multiple greenhouse gases and emissions-flow quantities such as instantaneous CO2 fluxes or emissions rates. It specifically focuses on the atmospheric state variable rather than source or sink fluxes.