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- The Serra da Estrela is part of the Iberian Central Cordillera and is the highest mountain in Portugal (1,993 m ASL). The Torre-Penhas Douradas and Alto da Pedrice-Malhada Alta plateaus with altitudes between 1,400 and 1,993m, which are separated by the Alforfa and Zezere valleys dominate the highest part of the range. The central massif is dissected by several glacially sculpted valleys that originate reliefs from 200 to 700m. This morphological diversity controla to a great extent the local climates of the mountain. Nine air temperature data loggers were installed in contrasting topographic situations, with special emphasis to valley floors and interfluve sites. Data collection was made each 2-hours from 27th December 1999 to 27th March 2000. Minima temperature most of the times occurs at 7 UTC. The minimum air temperature patterns based on the data from the nine sites were classified using k-means. Two contrasting events were chosen for the centroids of the classification. Cluster 1 representa the atable events with thermal inversions in the valleys and higher temperature in the interfluves. The valley floors at higher altitudes present lower temperatures than the ones at lower positions. Cluster 2 groups the unstable episodes with more turbulence and a temperature decrease controlled by altitude. In this group temperature does not depends on the topographic position. Key words: local climate, minimum temperatures, thermal patterns, cold air drainage, Serra da Estrela. ReSurilO - AS TEMPERATURAS MINIMAS DO AR NA SERRA DA ESTRELA, PORTUGAL A Serra da Estrela faz parte da Cordilheira central e e a montanha mais alta de Portugal Continental. As caracteristicas morfologicas da sena traduzem-se na existencia de dois sectores planalticos principais (Torre-Penhas Douradas e Alto da Pedrice-Malhada Alta) a altitudes situadas entre 1400 e 1993 m. A estas unidades altas contrapoem-se vales profundos, que ligara o interior da Berra as areas limitrofes. Sao estas caracteristicas morfologicas que determinara, era larga medida, os climas locais da Berra. Para o estudo dos padrbes termicos foram instalados 9 registadores automaticos de temperatura era posi~bes topograficas distintas (fundos de vale e topos). Os dados foram registados de duas em duas horas de 27 Dezembro de 1999 a 27 de Mamo de 2000. A temperatura minima diaria oco frequentemente cerca das 7 UTC, o que levou a seleccionar para analise observaqoes a esta hora. Os padroes termicos foram classificados usando a tecn de k-means. A analise teve como pomo de partida a identificarao de dois dias c padroes termicos contrastados, que foram usados como centroides para a cl sificaqao. O cluster 1 separou os dias caracterizados por situacoes estaveis, c acumulaqao de ar frio nos fundos de vale. As temperaturas sao, nesses casos, m baixas nas areas deprimidas e vales situados a maior altitude. O cluster 2 agrul os dias marcados por instabilidade. As temperaturas mais baixas ocorrem ~ areas mais elevadas independentemente da posi~,ao topografica. Palavras-chave: clima local, temperatura minima, padroes termicos, acun la<;ao de ar frio, Serra da Estrela.

Daily minimum air temperatures in the Serra da Estrela, Portugal