A study of the hourly variability of the urban heat island effect in the Greater Athens Area during summer

The Science of the Total Environment
K KourtidisD Melas

Abstract

Measurements of air temperature and humidity in the urban canopy layer during July 2009 in 26 sites in Athens, Greece, allowed for the mapping of the hourly spatiotemporal evolution of the urban heat island (UHI) effect. City districts neighboring to the mountains to the east were the hottest during the afternoon, while being among the coolest during the early morning hours. While during the early morning some coastal sites were the hottest, the warm air plume slowly moved to the densely urbanized center of the city until 14:00-15:00, moving then further west, to the Elefsis industrial area in the afternoon. Results from the UrbClim model agree fairly well with the observations. Satellite-derived land surface temperature (LST) data from AATSR, ASTER, AVHRR and MODIS, for pixels corresponding to ground stations measuring Tair, showed that LST can be up to 5K lower than the respective Tair during nighttime, while it can be up to 15K higher during the rest of the day. Generally, LST during late afternoon as acquired from AATSR is very near to Tair for all stations and all days, i.e., the AATSR LST afternoon retrieval can be used as a very good approximation of Tair. The hourly evolution of the spatial Tair distribution was almost ...Continue Reading

Citations

Dec 20, 2017·International Journal of Environmental Research and Public Health·Walter Leal FilhoAbul Quasem Al-Amin
Aug 3, 2019·International Journal of Environmental Research and Public Health·Chaobin YangXie Fu
May 26, 2021·The Science of the Total Environment·Se Woong Kim, Robert D Brown

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