Tool Name	Lapse Rate Based Temperature Downscaling (Bulk Processing)
Tool ID	35
Library ID	climate_tools
Version	1.0
Author(s)	O.Conrad (c) 2026

Description

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.

Parameters

Name	Type	Identifier	Description	Constraints
Input
Elevation	grid, input	LORES_DEM
Temperature	grid list, input	LORES_T
Lapse Rate	grid, input	LORES_LAPSE
Elevation	grid, input	HIRES_DEM
Output
Temperature	grid list, output	HIRES_T
Options
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 number	CONST_LAPSE	Constant lapse rate in degree of temperature per 100 meter.	Default: 0.600000