Assessment of Downward Longwave Radiation Models in Clear-Sky Desert Conditions
Abstract
The longwave downward radiation (LDR), emitted by the atmosphere and clouds, is a crucial parameter for the determination of the radiative energy budget on the earth’s surface. Direct measurement of LDR is very sensitive and requires specialized and expensive sensors, and is commonly not available at most meteorological monitoring sites. Considerable efforts have been made to determine LDR from the available atmospheric parameters of a particular site. This work presents an analysis of the longwave downward atmospheric radiation (LDR) in a region of desert conditions. The objective is to study and evaluate the performance of several downward longwave radiation models during clear-sky conditions, and determine the more adapted empirical relation for the observed local conditions. For the validation, we will use ground measurements of LDR radiation and atmospheric parameters at two different sites, with high temporal resolution of 1-min, covering a period of one year, with error and statistical analysis