INSTITUTO ARGENTINO DE NIVOLOGIA, GLACIOLOGIA Y CIENCIAS AMBIENTALES
Unidad Ejecutora - UE
congresos y reuniones científicas
Tree-ring based reconstruction of the Río Neuquén streamflow, northern Patagonia, Argentina
IGNACIO A. MUNDO; RICARDO VILLALBA; MARIANO S. MORALES; RAPHAEL NEUKOM; CARLOS LE QUESNE; ROCÍO URRUTIA; ANTONIO LARA; MARIANO MASIOKAS
Conferencia; Second American Dendrochronology Conference; 2013
University of Arizona
In most cases, gauged river flow records in southern South America extend for only a few decades, hampering the detection of long-term cycles and trends. In northern Patagonia, Argentina, the Río Neuquén has great importance for local and national socio-economic activities. We reconstructed the OctoberJune mean streamflow for the period 13462000 AD based on a network of 43 tree-ring chronologies from Araucaria araucana and Austrocedrus chilensis, grouped in composite series, using a nested principal component regression approach. Analyses of the frequency, intensity, and duration of droughts and pluvial events indicate that the 20th century contains some of the driest and wettest annual to decadal-scale events. Blackman-Tukey and singular spectral analyses identified oscillations from 3.5 to 17.5 yr. A dominant 6.8-yr cycle explains ca. 23.6% of the total variance in the reconstruction. Correlation analyses showed that discharges of this river are related to the Southern Annular Mode.