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Table 2

Observed time-averaged CO2 mole fraction above background (Site 01) for INFLUX tower sites, in order from least to greatest observed urban enhancement. The averaging period is 1 January – 30 April 2013. DOI: https://doi.org/10.1525/elementa.127.t2

Site 01Site 09Site 04Site 05Site 02Site 07Site 12Site 10Site 03

Maximum sampling height (m AGL) 121 130 60 125 136 58 40 40 54 
Average CO2 above background at maximum sampling height (ppm) – 0.3 0.8 0.8 1.4 1.6 2.5 2.5 2.9 
Approximated average CO2 above background at 40 m AGL (ppm) – 0.31 0.5 – 0.71,2 0.8 – 1.51,2 2.2 1.3 – 1.41,2 2.1 2.1 3.5 
Site 01Site 09Site 04Site 05Site 02Site 07Site 12Site 10Site 03

Maximum sampling height (m AGL) 121 130 60 125 136 58 40 40 54 
Average CO2 above background at maximum sampling height (ppm) – 0.3 0.8 0.8 1.4 1.6 2.5 2.5 2.9 
Approximated average CO2 above background at 40 m AGL (ppm) – 0.31 0.5 – 0.71,2 0.8 – 1.51,2 2.2 1.3 – 1.41,2 2.1 2.1 3.5 

1Gradient measured at Site 01 is used to approximate the gradient at this site.

1,2The range of values shown originates from using the gradients measured at Site 01 and Site 02 (Figure 14).

Note that the background value at Site 01 is 0.4 ppm higher at 40 m AGL compared to 121 m AGL.

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