Fig. 8: Ratios between the modeled and measured mBC as function of the altitude.

Round markers show spring data, whereas the squares show summer data. The orange markers show the ratios considering modeled BC data from the exact same grid cells as observations are available (labelled as Grid), the red markers were calculated taking the complete ROI (labelled as ROI) into account for the model. The vertical, dashed, black line shows the factor of unity.