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Aridity Index Formula

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Aridity Index is a numerical indicator of the degree of dryness of the climate at a given location. Check FAQs

AI = (\frac{PET - E act}{PET}) \cdot 100

AI - Aridity Index?PET - Daily Potential Evapotranspiration?E_act - Actual Evapotranspiration?

Aridity Index Example

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Here is how the Aridity Index equation looks like with Values.

Here is how the Aridity Index equation looks like with Units.

Here is how the Aridity Index equation looks like.

99.68 = (\frac{50 - 0.16}{50}) \cdot 100

99.68 = (\frac{50m³/s - 0.16m³/s}{50m³/s}) \cdot 100

99.68 = (\frac{50 - 0.16}{50}) \cdot 100

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Aridity Index Solution

Follow our step by step solution on how to calculate Aridity Index?

FIRST Step Consider the formula

AI = (\frac{PET - E act}{PET}) \cdot 100

Next Step Substitute values of Variables

∴

AI = (\frac{50m³/s - 0.16m³/s}{50m³/s}) \cdot 100

Next Step Prepare to Evaluate

∴

AI = (\frac{50 - 0.16}{50}) \cdot 100

LAST Step Evaluate

∴

AI = 99.68

Aridity Index Formula Elements

Variables

Aridity Index

Aridity Index is a numerical indicator of the degree of dryness of the climate at a given location.

Symbol: AI

Measurement: NAUnit: Unitless

Note: Value can be positive or negative.

Formulas to find Aridity Index

Daily Potential Evapotranspiration

Daily Potential Evapotranspiration (PET) is calculated from climate parameter data that is extracted from Global Data Assimilation System (GDAS) analysis fields.

Symbol: PET

Measurement: Volumetric Flow RateUnit: m³/s

Note: Value can be positive or negative.

Formulas to find Daily Potential Evapotranspiration

Actual Evapotranspiration

Actual Evapotranspiration is the quantity of water that is actually removed from a surface due to the processes of evaporation and transpiration.

Symbol: E_act

Measurement: Volumetric Flow RateUnit: m³/s

Note: Value can be positive or negative.

Formulas to find Actual Evapotranspiration

Other formulas in Evapotranspiration category

Go Change in Moisture Storage

ΔS = P - S r - G o - E act

Go Precipitation given Change in Moisture Storage

P = ΔS + S r + G o + E act

Go Runoff given Change in Moisture Storage

S r = - (ΔS - P + G o + E act)

Go Subsurface Outflow given Change in Moisture Storage

G o = P - ΔS - S r - E act

How to Evaluate Aridity Index?

Aridity Index evaluator uses Aridity Index = ((Daily Potential Evapotranspiration-Actual Evapotranspiration)/Daily Potential Evapotranspiration)*100 to evaluate the Aridity Index, The Aridity Index is a numerical indicator of the degree of dryness of the climate at a given location. Aridity Index is denoted by AI symbol.

How to evaluate Aridity Index using this online evaluator? To use this online evaluator for Aridity Index, enter Daily Potential Evapotranspiration (PET) & Actual Evapotranspiration (E_act) and hit the calculate button.

FAQs on Aridity Index

What is the formula to find Aridity Index?

The formula of Aridity Index is expressed as Aridity Index = ((Daily Potential Evapotranspiration-Actual Evapotranspiration)/Daily Potential Evapotranspiration)*100. Here is an example- 99.68 = ((50-0.16)/50)*100.

How to calculate Aridity Index?

With Daily Potential Evapotranspiration (PET) & Actual Evapotranspiration (E_act) we can find Aridity Index using the formula - Aridity Index = ((Daily Potential Evapotranspiration-Actual Evapotranspiration)/Daily Potential Evapotranspiration)*100.

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Aridity Index Formula

Aridity Index Example

Aridity Index Solution

Aridity Index Formula Elements

Other formulas in Evapotranspiration category

How to Evaluate Aridity Index?

FAQs on Aridity Index

Variable Name