Measurement and analysis of the variation of albedo and surface temperature at Pondok Betung, South Tangerang

Abstract

In 2021, the IPCC reported that the rate of global warming has reached 1.1°C. The BMKG also states that many regions in Indonesia are experiencing warming. Two indicators of global warming are surface air temperature (SAT) and albedo. Changes in these two variables contribute to an urban heat island (UHI). Recent research reveals an increase in the UHI index in Pondok Betung area. Variations in SAT and albedo values can be obtained through the Automatic Solar Radiation System, and Automatic Weather Station provided at the Pondok Betung BMKG Station. The data obtained are SAT and two types of albedos, namely the albedo of direct radiation and the albedo of diffuse radiation on a grass surface. The results obtained show a small increase in SAT and a small decrease in the two albedos. Such a result is to be expected in January 2021-June 2022. The lowest SAT was 26.16°C in January 2021, and the highest was 27.92°C in March 2021. The lowest direct albedo was 0.158 in July 2021, and the highest was 0.178 in October 2021. The lowest diffuse albedo was 0.173 in June 2021, and the highest was 0.183 in October 2021.