Temporal and Spatial Change Monitoring of Drought Grade Based on ERA5 Analysis Data and BFAST Method in the Belt and Road Area during 1989–2017

Figure 5

Trends of monthly scPDSI for the subregions. (a) Equatorial. (b) Arid. (c) Warm. (d) Snow. (e) Polar.

(a)

(b)

(c)

(d)

(e)