param_atmospheric: Support functions to estimate atmospheric parameters
In allogamous/EnvRtype: Envirotyping Tools for Crop Research and Genetic Improvment

param_atmospheric

R Documentation

Support functions to estimate atmospheric parameters

Description

Core of functions to estimate atmospheric parameters related to evapotranspiration. Fore more details about the equations see de FAO-evapotranspiration publication http://www.fao.org/3/X0490E/x0490e07.htm#atmospheric

Usage

param_atmospheric(
  env.data,
  PREC = NULL,
  Tdew = NULL,
  Tmin = NULL,
  Tmax = NULL,
  RH = NULL,
  Rad = NULL,
  G = NULL,
  Alt = 600,
  alpha = 1.26,
  merge = FALSE
)

Arguments

`env.data`	data.frame. A `get_weather()`-like output with additional solar radiation information. If a `get_weather()` is provided, no further argument is required but `G` and `alpha`.
`PREC`	character. Indicates the column of precipitation.
`Tdew`	character. Indicates the column of dew/frost.
`Tmin`	character. Indicates the column of minimum temperature.
`Tmax`	character. Indicates the column of maximum temperature.
`RH`	character. Indicates the column of reative humidity.
`Rad`	character. Indicates the column of solar radiation. This parameter can be calculated from `Param_Radiation()`.
`G`	numeric. Flux of heat conducted into the ground. Default is 0.
`Alt`	numeric. Elevation above sea level (meters)
`alpha`	Alpha of Priestley & Taylor's (1972) equation. Default is 1.26, which fit data from most sources.
`merge`	boolean. If `TRUE`, calculated variables are merged to the original `get_weather()` dataframe.

Details

This function requires a dataframe with all parameters listed above. If any is missing, an error will be returned. The calculated variables are:

SPV: Slope of saturation vapour pressure curve (kPa.Celsius)
VPD: Vapour pressure deficit (kPa)
ETP: Potential Evapotranspiration (mm.day)
PEPT: Deficit by Precipitation (mm.day)

Value

A dataframe with parameters related to evapotranspiration. See details for further information.

Author(s)

Germano Costa Neto

Examples

## Not run: 
### Fetching weather information from NASA-POWER
env.data = get_weather(lat = -13.05, lon = -56.05, country = 'BRA')

### Calculating solar radiation
env.data = param_radiation(env.data, merge = TRUE)

### Calculating solar radiation
param_atmospheric(env.data)

## or simply:
require(tidyverse)
env.data = get_weather(lat = -13.05, lon = -56.05, country = 'BRA') %>%
           param_radiation(merge = TRUE) %>%
           param_atmospheric(merge=T)

## End(Not run)

allogamous/EnvRtype documentation built on Nov. 1, 2024, 3:48 a.m.