Air Surface Temperature Variability and Trends from Satellite Homogenized Time Series Data Over Tunis 2003–2021

Abstract Monthly Air Surface Temperature (AST) data for Tunis were acquired by the Atmospheric InfraRed Sounder (AIRS) dataset (2003–2021), enrolments of 77 grids, each located in Spatial resolution 1°x1°, converted into monthly and annual analysed. The time series AST investigated temporal spatial trends during study period over six climate stations having sufficient available utilized this purpose. showed similar variations fluctuated AST, minimum (decreases, January) maximum (increases, July) trend, with standard deviation (294.15 + 14.02 K°). Most stations, appeared positive their series, only at Sfax negative, higher central than those closer to desert coast. lowest coastal area. Comparisons among selected (Tunis, Tabarka, Thala, Sfax, Medenine, EL-Borma) between observed AIRS in-situ close agreement range from 0.38 3.6 K°, approximately same north-to-south transect throughout year. validation results plainly evident a high correlation coefficient (R, 0.995, 0.997, 0.994, 0.94, 0.974 0.95), asset values (R 2 ) was 0.991, 0.987, 0.93, 0.993, 0.977 Tunis, EL-Borma respectively. satellite observation is able investigate atmosphere different zones.