Evapotranspiration (version 1.9)

ET.Linacre: Linacre Formulation

Description

Implementing the Linacre formulation for estimating actual evapotranspiration.

Usage

## S3 method for class 'Linacre':
ET(data, constants, ts="daily", \dots)

Arguments

data

A list of data which contains the following items (climate variables) required by Linacre formulation: Tmax, Tmin, Tdew

constants

A list named constants consists of constants required for the calculation of Linacre formulation which must contain the following items: Elev - ground elevation above mean sea level in m, lat - latitude in degrees.

ts

Must be either daily, monthly or annual, which indicates the disired time step that the output ET estimates should be on. Default is daily.

...

Dummy for generic function, no need to define.

Value

• The function prints a calculation summary to the screen containing the following elements: - ET model name and ET quantity estimated - Time step of the output ET estimates (i.e. the value of argument ts) - Units of the output ET estimates - Time duration of the ET estimation - Number of ET estimates obtained in the entire time-series - Basic statistics of the estimated ET time-series including mean, max and min values. The function also generates a list containing the following components, which is saved into a csv file named as ET_Linacre.csv in the working directory:
• ET.Daily
  Daily aggregated estimations of Linacre actual evapotranspiration.
• ET.Monthly
  Monthly aggregated estimations of Linacre actual evapotranspiration.
• ET.Annual
  Annually aggregated estimations of Linacre actual evapotranspiration.
• ET.MonthlyAve
  Monthly averaged estimations of daily Linacre actual evapotranspiration.
• ET.AnnualAve
  Annually averaged estimations of daily Linacre actual evapotranspiration.
• ET_formulation
  Name of the formulation used which equals to Linacre.
• ET_type
  Type of the estimation obtained which is Actual Evapotranspiration.

Details

This formulation provides a single calculation method with no alternatives available.

References

Linacre, E. T. 1977. A simple formula for estimating evaporation rates in various climates, using temperature data alone. Agricultural meteorology, 18, 409-424.

See Also

ET,data,defaultconstants,constants

Examples

# Use processed existing data set and constants from kent Town, Adelaide
data("processeddata")
data("constants")

# Call ET.Linacre under the generic function ET
results <- ET.Linacre(data, constants, ts="daily")