INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Frost rings records in Araucaria araucana forests from northern Patagonia since AD 1256
HADAD, MARTIN; AMOROSO, MARIANO; ROIG JUÑENT, FIDEL
Conferencia; Second American Dendrochronology Conference ? AmeriDendro2013; 2013
Tree rings are a reliable source of information for studying past climate variability. In this sense, frost events can be recorded in the annual rings of tree as frost rings. We analysed samples from five Araucaria araucana forests in northern Patagonia, Argentina and classified the position of frost damage within tree rings. A regional frost ring chronology of 700 years was developed. The most geographical-extended freezing events in the region took place in AD 1569, 1589, 1714, 1842, 1863, 1889, 1902, 1916, 1941, 1942 and 1948. Frost damage was primarily restricted to the middle section of the rings. The large frost rings events were detected at the juvenile wood portions, that is trees at biological ages of ≤100 years and about 6 cm of stem diameter. The regional frost ring record from A. araucana may be used as an extreme temperature event record for paleoclimate reconstruction.