Tool Lapse Rate Based Temperature Downscaling
The Lapse Rate Based Temperature Downscaling is quite simple, but might perform well for mountainous regions, where the altitudinal gradient is the main driver for local temperature variation. First, a given lapse rate is used to estimate sea level temperatures from elevation and temperature data at a coarse resolution. Second, the same lapse rate is used to estimate the terrain surface temperature using higher resoluted elevation data and the spline interpolated sea level temperatures from the previous step. The lapse rates can be defined as one constant value valid for the whole area of interest, or as varying value as defined by an additional input grid. Alternatively a constant lapse rate can be estimated from the coarse resolution input with a regression analysis.
- Author: O.Conrad (c) 2021
- Menu: Climate and Weather|Temperature
Parameters
Name | Type | Identifier | Description | Constraints | |
---|---|---|---|---|---|
Input | Elevation | Grid, input | LORES_DEM | - | - |
Temperature | Grid, input | LORES_T | - | - | |
Lapse Rate | Grid, input | LORES_LAPSE | - | - | |
Elevation | Grid, input | HIRES_DEM | - | - | |
Output | Sea Level Temperature (*) | Grid, output, optional | LORES_SLT | - | - |
Temperature | Grid, output | HIRES_T | - | - | |
Regression Summary (*) | Table, output, optional | REGRS_SUMMARY | - | - | |
Options | Coarse Resolution | Grid system | LORES_GRID_SYSTEM | - | - |
High Resolution | Grid system | HIRES_GRID_SYSTEM | - | - | |
Lapse Rate | Choice | LAPSE_METHOD | - | Available Choices: [0] constant lapse rate [1] constant lapse rate from regression [2] varying lapse rate from grid Default: 1 | |
Regression | Choice | REGRS_LAPSE | - | Available Choices: [0] elevation [1] elevation and position [2] elevation and position (2nd order polynom) Default: 2 | |
Limit Minimum Lapse Rate | Boolean | LIMIT_LAPSE | If set, lapse rates from regression are limited to a minimum as specified by the constant lapse rate parameter. | Default: 0 | |
Constant Lapse Rate | Floating point | CONST_LAPSE | Constant lapse rate in degree of temperature per 100 meter. | Default: 0.600000 | |
(*) optional |
Command-line
Usage: saga_cmd climate_tools 30 [-LORES_DEM <str>] [-LORES_T <str>] [-LORES_LAPSE <str>] [-LORES_SLT <str>] [-HIRES_DEM <str>] [-HIRES_T <str>] [-LAPSE_METHOD <str>] [-REGRS_SUMMARY <str>] [-REGRS_LAPSE <str>] [-LIMIT_LAPSE <str>] [-CONST_LAPSE <double>] -LORES_DEM:<str> Elevation Grid, input -LORES_T:<str> Temperature Grid, input -LORES_LAPSE:<str> Lapse Rate Grid, input -LORES_SLT:<str> Sea Level Temperature Grid, output, optional -HIRES_DEM:<str> Elevation Grid, input -HIRES_T:<str> Temperature Grid, output -LAPSE_METHOD:<str> Lapse Rate Choice Available Choices: [0] constant lapse rate [1] constant lapse rate from regression [2] varying lapse rate from grid Default: 1 -REGRS_SUMMARY:<str> Regression Summary Table, output, optional -REGRS_LAPSE:<str> Regression Choice Available Choices: [0] elevation [1] elevation and position [2] elevation and position (2nd order polynom) Default: 2 -LIMIT_LAPSE:<str> Limit Minimum Lapse Rate Boolean Default: 0 -CONST_LAPSE:<double> Constant Lapse Rate Floating point Default: 0.600000