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| Natura: | Artículo científico |
| Lingua: | en |
| Pubblicazione: |
Universidad Nacional Autónoma de México
2005
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| Accesso online: | https://www.redalyc.org/articulo.oa?id=56518404 |
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Sommario:
- Possible impact of urbanization on the thermal climate of some large cities in México E. Jáuregui Biología México Heat island urban warming Urbanization has been the dominant demographic trend during the second half of the 20th century in México.In 2000 there were 69 cities with more than 100,000 inhabitants of which 9 of them exceeded one millionpopulation, totalizing 53.4 million. Using time series of mean monthly temperature for about a dozen availablestations, this paper sets out to examine temperature changes occurring during the late 20th century. Since itis well established that urban warming is mainly a nocturnal phenomenon minimum temperature series were selected after a test for homogeneity. Trend analysis was applied to the minimum temperature series and alinear regression coefficient was obtained. Tests of significance were performed. Most of the positive trendsproved to be significant (>90%). Although temperature trend variability amongst the individual cities waslarge (from 0.02°C/decade to 0.74 °C/decade) average temperature increase in large (≥106 inhabitants) citieswas (0.57 °C/decade) considerably higher than that corresponding to medium size urban centers where on theaverage temperature increase was 0.37 °C/decade. These temperature increases express not only the urbanizationeffect but also that due to global climate change (of the order of 0.07 °C/decade) and natural variability. Inconcluding it may be said that increasing urbanization in México has originated a positive trend in urbantemperatures which has implicationsfor human comfort and health. 2005 artículo científico 0187-6236 https://www.redalyc.org/articulo.oa?id=56518404 en http://www.redalyc.org/revista.oa?id=565 Atmósfera application/pdf Universidad Nacional Autónoma de México Atmósfera (México) Num.4 Vol.18