Serial Analysis of Ten Precipitation-Based Indices by Land Use in Semiarid Regions

Table 2

Acronyms and short descriptions of the ten precipitation-based indices.

ID	Short name. Description	Output time units
CWD	Consecutive wet days. Maximum number of consecutive days with RR ≥1 mm	Days
PRCPTOT	Annual total wet-day precipitation. Annual total PRCP in wet days (RR ≥1 mm)	Annual
R10mm	Number of heavy precipitation days. Annual count of days when PRCP ≥10 mm	Annual
R20mm	Number of very heavy precipitation days. Annual count of days when PRCP ≥20 mm	Annual
R95p	Very wet days. Annual total PRCP when RR >95th percentile	Annual
R99p	Extremely wet days. Annual total PRCP when RR >99th percentile	Annual
R25mm	Number of days above 25 mm. Annual count of days when PRCP ≥25 mm	Annual
R1day	Max 1-day precipitation amount. Monthly maximum 1-day precipitation	Monthly
R5day	Max 5-day precipitation amount. Monthly maximum consecutive 5-day precipitation	Monthly
SDII	Simple daily intensity index. Annual total precipitation divided by the number of wet days (defined as PRCP ≥1.0 mm) in the year	Annual