frostProb: First day in the year where P(tmin<0) <= prob

In agroclim: Climatic Indices for Agriculture

First day in the year where P(tmin<0) <= prob

Description

Calculates the first day in the year where the probability if frost is under a threshold.

Usage

frostProb(
  mn,
  dates,
  iniday = "07-01",
  endday = "06-30",
  type = "doy",
  thres = 0,
  prob = 0.1
)

Arguments

mn	vector of daily minimum temperature series.
dates	vector of dates corresponding with daily temprature series
iniday	first day of the year ("dd-mm") when frost occurrence will be considered.
endday	last day of the year ("dd-mm") when frost occurrence will be considered.
type	type of output. It can be "doy" for day of the year (julian day) or "date" for data format ("dd-mm").
thres	temperature threshold considered to trigger frost occurrence (0 by default).
prob	numeric. Threshold indicating the probability (0.10 by default)

Details

The function is able to span over years. If the argument "enddate" is a date earlier than "inidate", the considered period will cover from "inidate" to the end of the year and from the beginning of the next year to "enddate".#' @return depending on argument type, the output will be a numeric vector of julian days (type = "doy") or a vector of characters with dates (type = "date").

Value

A numeric vector with the annual number of frost probability is returned.

Examples

frostProb(mn = daily_tmin,
  dates = seq.Date(as.Date('1981-01-01'),
                             as.Date('2010-12-31'), by ='day'),
  iniday = '07-01',
  endday = '06-30',
  type = 'date',
  prob = 0.10)

agroclim documentation built on Oct. 14, 2022, 9:05 a.m.