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Potential of oak tree-ring chronologies from southern Portugal for climate reconstructions
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Orientador(es)
Resumo(s)
The present work reports a first attempt to assemble long tree-ring chronologies from Portugal potentially
useful for climate reconstructions. Three oak species (Quercus pyrenaica, Quercus faginea, and Quercus
ilex) were sampled at three sites in southern Portugal to obtain tree-ring chronologies. The longest tree
ring series covers 173 years extending back to 1840. Our tree-ring records show, depending on the site,
moderate-to-high correlations with precipitation in different seasons (from r = 0.40, p < 0.01, to 0.81,
p < 0.001) and temporal stability in the growth/climate relationship for two sites. Calibration-verification
trials confirm the reliability of climate/growth models for climatic reconstructions back to periods represented
by tree-ring records from these two sites. Regional precipitation for Alentejo can be estimated for
the following seasons: April through August (calibration r2 = 0.24); September, from previous year, to July
(calibration r2 = 0.65). The results are a promising kick-off for Portuguese dendroclimatology, since they
represent a significant breakthrough in the Mediterranean region, especially for Iberian Peninsula, where
there is a considerable lack of dendroclimatic reconstructions. Further efforts to extend the tree-ring
records back in time using subfossil material should be undertaken
Descrição
Original Article
Palavras-chave
dendrochronologia oak Quercus Mediterranean
Contexto Educativo
Citação
Dendrochronologia 35 (2015) 4–13
Editora
Elsevier