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High accuracy and compatible measurement was extended to obtain atmospheric CO2 mole fractions at ten typical sites over China.Observational data from 2009 to 2012 indicated that CO2 mole fractions at the 3 GAW regional stations (LAN in Yangtze River Delta, LFS in Northeast China with paddy rice & forest,SDZ located 150km northeast Beijing) were much more affected by local sources and sinks than the GAW global station WLG in remote western China.