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Abstract:

During recent years, numerous studies have examined the Buenos Aires urban climate, but the relationship between large-scale weather conditions and the Buenos Aires urban heat island (UHI) intensity has not been studied. The goal of this paper is to apply an objective synoptic climatological method to identify homogeneous air masses or weather types affecting Buenos Aires during winter, and to relate the results to the UHI intensity. A K-means clustering method was used to define six different air masses considering the 03:00, 09:00, 15:00 and 21:00 LT surface observations of dry bulb temperature, dew point, cloud cover, atmospheric pressure and wind direction and velocity at Ezeiza, the most rural meteorological station of the Buenos Aires metropolitan area. Results show that the mean UHI intensity is at its maximum (2.8°C) a few hours before sunrise when conditions are dominated by cold air masses associated with cold-core anticyclones, weak winds and low cloud cover. Inverse heat islands are found during the afternoon for all air masses indicating that surface processes are not dominant at that time. The relatively infrequent and warmest air mass is the only one that presents a mean negative urban-rural temperature difference (-0.1°C) during the afternoon with the smallest diurnal cycle of the UHI intensity probably due to the prevailing high humidity and cloudy sky conditions. The paper provides an insight into the Buenos Aires urban-rural temperature difference under a variety of winter weather types and results could be useful to improve local daily temperature forecasts for the metropolitan area of Buenos Aires on the basis of the routine forecasts of weather types.

Registro:

Documento: Artículo
Título:Objective method for classifying air masses: An application to the analysis of Buenos Aires' (Argentina) urban heat island intensity
Autor:Bejarán, R.A.; Camilloni, I.A.
Filiación:Department of Atmospheric Sciences, University of Buenos Aires, Pabellón 2, Buenos Aires 1428, Argentina
Department of Atmospheric Sciences, Ctr.Investigaciones Mar/Atmosfera, Univ. of Buenos Aire - CONICET, Pabellón 2, Buenos Aires 1428, Argentina
Palabras clave:air mass; heat island; synoptic meteorology; temperature; urban climate; Argentina; Buenos Aires
Año:2003
Volumen:74
Número:1-2
Página de inicio:93
Página de fin:103
DOI: http://dx.doi.org/10.1007/s00704-002-0714-4
Título revista:Theoretical and Applied Climatology
Título revista abreviado:Theor. Appl. Climatol.
ISSN:0177798X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0177798X_v74_n1-2_p93_Bejaran

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Citas:

---------- APA ----------
Bejarán, R.A. & Camilloni, I.A. (2003) . Objective method for classifying air masses: An application to the analysis of Buenos Aires' (Argentina) urban heat island intensity. Theoretical and Applied Climatology, 74(1-2), 93-103.
http://dx.doi.org/10.1007/s00704-002-0714-4
---------- CHICAGO ----------
Bejarán, R.A., Camilloni, I.A. "Objective method for classifying air masses: An application to the analysis of Buenos Aires' (Argentina) urban heat island intensity" . Theoretical and Applied Climatology 74, no. 1-2 (2003) : 93-103.
http://dx.doi.org/10.1007/s00704-002-0714-4
---------- MLA ----------
Bejarán, R.A., Camilloni, I.A. "Objective method for classifying air masses: An application to the analysis of Buenos Aires' (Argentina) urban heat island intensity" . Theoretical and Applied Climatology, vol. 74, no. 1-2, 2003, pp. 93-103.
http://dx.doi.org/10.1007/s00704-002-0714-4
---------- VANCOUVER ----------
Bejarán, R.A., Camilloni, I.A. Objective method for classifying air masses: An application to the analysis of Buenos Aires' (Argentina) urban heat island intensity. Theor. Appl. Climatol. 2003;74(1-2):93-103.
http://dx.doi.org/10.1007/s00704-002-0714-4