SRT2-type drylands: aridity index

 

SRT2-type drylands: aridity index

The Global-Aridity surface shows moisture availability for potential growth of reference vegetation excluding the impact of soil mediating water runoff events. UNEP (UNEP 1997) breaks up Aridity Index, in the traditional classification scheme presented below. 
Value Climate Class
< 0.03
Hyper Arid
0.03 – 0.2
Arid
0.2 – 0.5
Semi-Arid
0.5 – 0.65
Dry sub-humid
> 0.65
Humid

The Global-Aridity surface shows moisture availability for potential growth of reference vegetation excluding the impact of soil mediating water runoff events. UNEP (UNEP 1997) breaks up Aridity Index, in the traditional classification scheme presented below. 
Value Climate Class
< 0.03
Hyper Arid
0.03 – 0.2
Arid
0.2 – 0.5
Semi-Arid
0.5 – 0.65
Dry sub-humid
> 0.65
Humid

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