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Thermal behaviours based on air temperature observations in different Local Climate Zones in Bogotá, Colombia

Edwin Alejandro Ramírez-Aguilar*, Léa Cristina Lucas Souza

*Corresponding author:

ABSTRACT: This paper demonstrates an early application of Local Climate Zones (LCZ) in the city of Bogotá, Colombia. The main goal is to assess the thermal behaviour between the area of influence (sectors) of 10 meteorological stations in the city, classified into the LCZ scheme, from which air temperature observations at 7:00, 13:00, 19:00 (T7:00, T13:00 and T19:00) and daily measurements were obtained extracting the maximum (Tmax), minimum (Tmin) and mean (Tmean) values. Their distribution and variation were analyzed, thermal sensation categories were calculated, and the thermal differences (ΔTLCZX-LCZD) between open-compact LCZ types and LCZD (low plants – typical rural type) were obtained so that they could be examined, observing the changes and identifying the patterns between the stations and their LCZ identified. Furthermore, a comparison between the urban form parameters and the ranges proposed in the literature to classify LCZ were made. The results clearly show variations and patterns between the stations and their LCZ when using Tmin, T7:00 and T19:00 air temperature data and the indices and categories calculated from these. Values of ΔTLCZX-LCZD > 5°C were found in the densely urbanised LCZ at night and some negative values at noon suggest the presence of the Urban Cool Island. However, the need to group different LCZ types showed some difficulties in identifying thermal differences between them. The main conclusion is that Bogotá’s urban surface does not generate high temperatures, but decreases low values of Tmin, Tmean, T19:00 and T7:00. These results recognise the usefulness of the LCZ in understanding differences and temperature variations between divergent urban sectors.