Estimation of daily potential evapotranspiration from weather data with different methods. Besides mean daily temperature it depends on the chosen method which additional data has to be provided. In order to estimate extraterrestrial net radiation some of the methods need to know the location's geographic latitude and the date's Julian day number.
| Name | Type | Identifier | Description | Constraints |
Input | Mean Temperature (*) | Grid, input, optional | T | [Celsius] | - |
Minimum Temperature (*) | Grid, input, optional | T_MIN | [Celsius] | - |
Maximum Temperature (*) | Grid, input, optional | T_MAX | [Celsius] | - |
Relative Humidity (*) | Grid, input, optional | RH | [Percent] | - |
Solar Radiation (*) | Grid, input, optional | SR | [J/cm^2] | - |
Wind Speed (*) | Grid, input, optional | WS | [m/s] | - |
Air Pressure (*) | Grid, input, optional | P | [kPa] | - |
Output | Potential Evapotranspiration | Grid, output | ET | - | - |
Options | Grid System | Grid system | PARAMETERS_GRID_SYSTEM | - | - |
Default | Floating point | T_DEFAULT | default value if no grid has been selected | Minimum: -273.150000 Default: 10.000000 |
Default | Floating point | T_MIN_DEFAULT | default value if no grid has been selected | Minimum: -273.150000 Default: 0.000000 |
Default | Floating point | T_MAX_DEFAULT | default value if no grid has been selected | Minimum: -273.150000 Default: 20.000000 |
Default | Floating point | RH_DEFAULT | default value if no grid has been selected | Minimum: 0.000000 Maximum: 100.000000 Default: 50.000000 |
Default | Floating point | SR_DEFAULT | default value if no grid has been selected | Minimum: 0.000000 Default: 2.000000 |
Default | Floating point | WS_DEFAULT | default value if no grid has been selected | Minimum: 0.000000 Default: 5.000000 |
Default | Floating point | P_DEFAULT | default value if no grid has been selected | Minimum: 0.000000 Default: 101.300000 |
Method | Choice | METHOD | - | Available Choices: [0] Turc [1] Hargreave [2] Penman (simplified) [3] Penman-Monteith Default: 0 |
Estimate Solar Radiation | Boolean | SR_EST | Estimate solar radiation from date, latitudinal position and sunshine duration as percentage of its potential maximum. | Default: 0 |
Sunshine Duration | Floating point | SUNSHINE | Daily sunshine duration as percentage of its potential maximum. | Minimum: 0.000000 Maximum: 100.000000 Default: 50.000000 |
Time | Choice | TIME | - | Available Choices: [0] day [1] month Default: 0 |
Month | Choice | MONTH | - | Available Choices: [0] January [1] February [2] March [3] April [4] May [5] June [6] July [7] August [8] September [9] October [10] November [11] December Default: 9 |
Day of Month | Integer | DAY | - | Minimum: 1 Maximum: 31 Default: 12 |
Latitude | Floating point | LAT | [Degree] | Minimum: -90.000000 Maximum: 90.000000 Default: 53.000000 |
(*) optional |