Fig. 1: Effect of aerosol and clouds on diffuse radiation.
From: Organic aerosol enhances boreal forest photosynthesis under cumulus clouds
Diffuse radiation 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 diffuse radiation under low organic aerosol (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. Results testing the difference in diffuse radiation between the low and high OA loading 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 panel (a), low and high OA observations are statistically significantly different from each other in all the bins (p < 0.05), and the same is true for the panel (b), except for the earliest and latest hour bins (6:00–8:00 and 16:00–18:00 LT), where the difference is not statistically significant.
