Temporal variability of the Buenos Aires, Argentina, urban heat island
This paper describes the statistical characteristics and temporal variability of the urban heat island (UHI) intensity in Buenos Aires using 32-year surface meteorological data with 1-h time intervals. Seasonal analyses show that the UHI intensity is strongest during summer months and an “inverse” effect is found frequently during the afternoon hours of the same season. During winter, the UHI effect is in the minimal. The interannual trend and the seasonal variation of the UHI for the main synoptic hours for a longer record of 48 years are studied and associated to changes in meteorological factors as low-level circulation and cloud amount. Despite the population growth, it was found a negative trend in the nocturnal UHI intensity that could be explained by a decline of near clear-sky conditions, a negative trend in the calm frequencies and an increase in wind speed. Urban to rural temperature differences and rural temperatures are negatively correlated for diurnal and nocturnal hours both for annual and seasonal scales. This result is due to the lower interannual variability of urban temperatures in comparison to rural ones.
KeywordsLocal Time Urban Heat Island Cloud Amount Urban Heat Island Effect Urban Heat Island Intensity
This research was supported by the University of Buenos Aires UBACYT-X033, Consejo Nacional de Investigaciones Científicas y Técnicas PIP2009-00444 and Agencia Nacional de Promoción Científica y Tecnológica PICT07-00400. The meteorological information used in the present study was provided by the Servicio Meteorológico Nacional. The authors are grateful to two anonymous reviewers who contributed to improve this manuscript and to Aníbal Carbajo for preparing Fig. 2.
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