Fig. 2: Effect of aerosol and clouds on photosynthesis.
From: Organic aerosol enhances boreal forest photosynthesis under cumulus clouds
GPP as a function of cloud fraction (a) and time of the day (b). Blue notched boxes show median values and interquartile ranges (IQR, 25–75 percentile) of GPP under low OA loading, and red notched boxes - under high OA loading. Whiskers denote 1.5 IQR range, and the remaining points are ‘outliers’. Black crosses show mean values. The dashed lines mark mean GPP on a clear sky day with low aerosol loading. Results testing the difference in GPP between the low and high aerosol load cases (p-values, Wilcoxon rank sum test) at each cloud fraction bin or time of the day, as well as the number of points for low and high aerosol cases (N(l) and N(h), respectively) are shown above the figures. In the left panel, only the GPP difference at CF 0.4–0.8 is statistically significant, and in the right panel, only the GPP difference at hours at 8:00–10:00 and 14:00–16:00 LT is statistically significant.
