Abstract Climatic signals in beech tree-ring width se-ries from Central Italy have been studied over different periods of time. Prewhitened tree-ring chronologies re-spond mainly to summer precipitation and they do not correlate in a significant manner with the winter North Atlantic oscillation (NAO...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.472.2312 http://www.unitus.it/dipartimenti/daf/dendro/pubblicazioni/Int_J_Biometereology_2000.pdf |
| Summary: | Abstract Climatic signals in beech tree-ring width se-ries from Central Italy have been studied over different periods of time. Prewhitened tree-ring chronologies re-spond mainly to summer precipitation and they do not correlate in a significant manner with the winter North Atlantic oscillation (NAO) index. In this high-frequency pattern the NAO signs are only found on a small number of rings characterized by being very narrow or wide. By contrast, tree-ring width chronologies in which all the frequency components are conserved were significantly related to the NAO. The significant inverse correlation between actual measurements of ring width and NAO is a consequence of the availability of water in the soil at the beginning of the growing season. In fact, in the Med-iterranean area the recharging of soil moisture depends on the amount of winter precipitation, which is inversely correlated with the NAO. Strong signals of winter pre-cipitation and NAO are found in the low-frequency com-ponents of tree-ring growth. |
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