Indices are qualified indicators, because compared to standard values.

 

 

P (mm): precipitation

Pt (mm): minimum threshold precipitation (e.g. 0.2 mm)

∑P (mm): sum of P > Pt

SDI < 2 mm d-1: light
2 mm d-1 ≤ SDI < 5 mm d-1: intermediate
5 mm d-1 ≤ SDI: heavy

 

T (oC): air temperature

R (MJ m-2 d-1): solar radiation

 

SIP < -0.13: wetter winters than summers
-0.13 ≤ SIP ≤ 0.13: uniform distribution
SIP > 0.13: wetter summers than winters

 

FIm < 1300: uniformity
1300 ≤ FIm < 1800: fairly poor uniformity
1800 ≤ FIm < 2200: poor uniformity
2200 ≤ FIm < 2500: irregularity
2500 ≤ FIm < 2700: fairly high irregularity
FIm > 2700: high irregularity

K ≤ 12.4: maritime
12.4 < K ≤ 18.4: weakly maritime
18.4 ≤ K < 27.4: neutral
27.4 ≤ K<33.4: weakly continental
33.4 ≤ K: continental

 

MI2 < 1.5: non seasonal, non-Mediterranean climate (tropical or temperate)
1.5 ≤ MI2 < 2:  sub-Mediterranean climate
MI2 > 2: typical Mediterranean climate

 

b < 5: extreme aridity
5 ≤ b ≤ 14: aridity
15 ≤ b ≤ 19: semi-aridity
20 ≤ b ≤ 29: sub-humidity
30 ≤ b ≤ 59: humidity
b > 59: strong humidity

 

Q ≤ 1: no water deficit
1 < Q ≤ 3.4:  limited water deficit
3.4 < Q ≤ 10:  severe water deficit
Q > 10:  desert climate

ID < 0.05: very arid
0.05 ≤ ID < 0.20: arid
0.20 ≤ ID < 0.50: semi-arid
0.50 ≤ ID: dry sub-tropic

 

PY (mm): annual precipitation

PS (mm): summer semester (May-October in the northern hemisphere, November-April in the southern hemisphere) precipitation

PW (mm): winter semester (November-April in the northern hemisphere, May-October in the southern hemisphere) precipitation

p (mm): monthly precipitation

M (oC): mean daily maximum temperature of the warmest month

m (oC): mean daily minimum temperature of the coldest month

M - m < 15 °C: oceanic insular zones
15 ≤ M - m < 25 °C: lowland littoral zones
25 ≤ M - m < 35 °C: semi-continental zones
35 °C ≤ M - m:  continental zones

A (oC): mean annual air temperature amplitude

L (o): latitude (absolute value) of the site

Ps (mm): summer trimester (June-August in the northern hemisphere, December-February in the southern hemisphere) precipitation

Pw (mm): winter trimester (December-February in the northern hemisphere, June-August in the southern hemisphere) precipitation

pa (mm): precipitation of the most arid month

TY (oC): mean annual air temperature

Ta (oC): mean air temperature of the most arid month

Rn (MJ m-2 year-1): annual sum of net solar radiation (=0.45·Rg)

Rg (MJ m-2 year-1): annual sum of incoming solar radiation

l (MJ kg-1): latent heat of vaporization (=2.45)

ETY (mm): annual total reference evapotranspiration

WS (mm): annual surplus of water (sum of positive differences between precipitation and reference evapotranspiration)

WD (mm): annual deficit of water (sum of negative differences between precipitation and reference evapotranspiration

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