chillR (version 0.62)

GDH: Calculation of cumulative heat according to the Growing Degree Hours Model

Description

This function calculates heat for temperate trees according to the Growing Degree Hours Model.

Usage

GDH(HourTemp, summ = TRUE)

Arguments

HourTemp

Vector of hourly temperatures.

summ

Boolean parameter indicating whether calculated metrics should be provided as cumulative values over the entire record (TRUE) or as the actual accumulation for each hour (FALSE).

Value

Vector of length length(HourTemp) containing the cumulative Growing Degree Hours over the entire duration of HourTemp.

Details

Growing Degree Hours are calculated as suggested by Anderson et al. (1986).

References

Growing Degree Hours reference:

Anderson JL, Richardson EA, Kesner CD (1986) Validation of chill unit and flower bud phenology models for 'Montmorency' sour cherry. Acta Hortic 184, 71-78

Examples

weather<-fix_weather(KA_weather[which(KA_weather$Year>2006),])

hourtemps<-stack_hourly_temps(weather,latitude=50.4)

GDH(hourtemps$hourtemps$Temp)