Dependence of Warm Season Cloud-to-Ground Lightning Polarity on Environmental Conditions over Sichuan, Southwest China

Figure 2

Relative frequency (unit: %) of (a) –CG and (b) +CG lightning during the warm season in Sichuan, (c) +CG lightning density (unit: flashes km⁻² year⁻¹), and (d) monthly distribution of +CG lightning relative frequency. The plateau region and the basin region are outlined by black and blue rectangles, respectively, in the left panel.

(a)

(b)

(c)

(d)