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