Tool Growing Degree Days

This tool calculates growing degree days from daily or from spline interpolated monthly observations for a given threshold. It also calculates the julian day at which a specific target temperature sum is reached.

Author: D.N. Karger (c) 2017
Menu: Climate and Weather|Bioclimatology

Parameters

	Name	Type	Identifier	Description	Constraints
Input	Mean Monthly Temperatures	Grid list, input	`TMEAN`	Monthly (12) temperature observations.	-
Output	Number of Days above Base Temperature	Grid, output	`NGDD`	Number of days above base temperature.	-
	Growing Degree Days	Grid, output	`TSUM`	Integral of daily temperature above base temperature.	-
	First Growing Degree Day (*)	Grid, output, optional	`FIRST`	First growing degree day of the year (1-365).	-
	Last Growing Degree Day (*)	Grid, output, optional	`LAST`	Last growing degree day of the year (1-365).	-
	Degree Sum Target Day (*)	Grid, output, optional	`TARGET`	Day of the year at which temperature sum is reached (1-365).	-
Options	Grid System	Grid system	`PARAMETERS_GRID_SYSTEM`	-	-
	Base Temperature	Floating point	`TBASE`	Base temperature in degree Celsius	Default: 10.000000
	Degree Sum	Floating point	`TTARGET`	Target temperature sum in degree Celsius.	Default: 100.000000
(*) optional

Command-line

Usage: saga_cmd climate_tools 18 [-TMEAN <str>] [-TBASE <double>] [-NGDD <str>] [-TSUM <str>] [-FIRST <str>] [-LAST <str>] [-TARGET <str>] [-TTARGET <double>]
  -TMEAN:<str>     	Mean Monthly Temperatures
	Grid list, input
  -TBASE:<double>  	Base Temperature
	Floating point
	Default: 10.000000
  -NGDD:<str>      	Number of Days above Base Temperature
	Grid, output
  -TSUM:<str>      	Growing Degree Days
	Grid, output
  -FIRST:<str>     	First Growing Degree Day
	Grid, output, optional
  -LAST:<str>      	Last Growing Degree Day
	Grid, output, optional
  -TARGET:<str>    	Degree Sum Target Day
	Grid, output, optional
  -TTARGET:<double>	Degree Sum
	Floating point
	Default: 100.000000