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The concentration of atmospheric CO2 in Beijing increased rapidly at a mean growth rate of 3.7% · a−1 from 1993 to 1995. After displaying a peak of (409.7±25.9) μmol · mol−1 in 1995, it decreased slowly. Both the almost stable anthropogenic CO2 source and increasing biotic CO2 sink contribute to the drop of CO2 concentration from 1995 to 2000. The seasonal variation of CO2 concentration exhibits a...
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