Fig. 8
a Modelled CO2 enhancement using Tower 09 (agricultural) as a background (green) and Tower 01 (forested) as a background (blue), averaged over INFLUX urban towers for 2014. Wind directions for which either Tower 01 or Tower 09 are in the urban plume have been excluded. Only afternoon hours (1200–1700 LST) are included. Error bars indicate the standard error amongst the urban towers. b Model-data mismatch. Note that there was an instrument failure at Tower 09 for September–December 2014. c Percent mismatch, i.e., model-data mismatch divided by the modelled CO2 enhancement