Figure 2
Matrix of plots and correlation coefficients between variables for the ICN over four years (2015–2018). The upper panel above the diagonal in each matrix shows correlation coefficients between two variables; the lower panel below the diagonal gives their scatter plots. The histograms of each variable are shown in the diagonal line. For WX (weather), the upper and lower panels (the two are the same) give boxplots of each variable categorized by eight WX levels: None, HZ (haze), DU (dust), BR (mist), FG (fog), DZ (drizzle), RA (rain), and SN (snow) in order. Units are as follows; CPM (μg m−3), PM2.5 (μg m−3), TMP (℃), RH (%), WS (kt*), and VIS (km) respectively. *1 kt = 0.5144 m s−1.
