GDH function

Calculation of cumulative heat according to the Growing Degree Hours Model

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

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).

Returns

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).

Examples

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

hourtemps<-stack_hourly_temps(weather,latitude=50.4)

GDH(hourtemps$hourtemps$Temp)

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

Author(s)

Eike Luedeling