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Ground temperature regimes and geomorphological implications in a Mediterranean mountain (Serra da Estrela, Portugal)
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Orientador(es)
Resumo(s)
Air and shallow ground temperatures from two monitoring sites at the Serra da Estrela (Portugal) are analysed. The Caˆntaro
Gordo site is located at 1875 m ASL and the Fraga das Penas at 1640 m ASL. The climate of the study area is Mediterranean
and very irregular, both on a yearly and monthly basis. This is particularly significant during winter, when differences in snow
cover have direct influence on the ground thermal regimes and therefore on geocryological processes. To assess the significance
of the ground thermal regimes for the geomorphological dynamics, bi-hourly records of temperature are studied at a daily basis.
Eight types of daily regime were identified: isothermal unfrozen, non-isothermal unfrozen, surficial freeze–thaw, surficial
freeze–thaw and subsurficial frost, surficial and subsurficial freeze–thaw, subsurficial frost, surficial and subsurficial frost and
surficial frost but no daily rhythm. The occurrence of these regimes is analysed and their geomorphological significance is
presented. Based on the altitudinal differences of the two monitoring sites, on the occurrence of the different regimes and on
field observations, a conceptual model for the altitudinal and seasonal zoning of the daily thermal regimes of the ground is
presented. This model was prepared for the Serra da Estrela, but it can be used in other Mediterranean or tropical areas if altitude
and seasonal precipitation differences are taken in explanation.
Descrição
Palavras-chave
Ground temperature Periglacial Frost Freeze– thaw Mediterranean mountain
Contexto Educativo
Citação
Vieira, G. T., Mora, C., & Ramos, M. (2003). Ground temperature regimes and geomorphological implications in a Mediterranean mountain (Serra da Estrela, Portugal). Geomorphology, 52(1–2), 57–72. https://doi.org/10.1016/S0169-555X(02)00248-9.
Editora
Elsevier