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| Titel |
Multi-century tree-ring based reconstruction of the Neuquén River streamflow, northern Patagonia, Argentina |
| VerfasserIn |
I. A. Mundo, M. H. Masiokas, R. Villalba, M. S. Morales, R. Neukom, C. Quesne, R. B. Urrutia, A. Lara |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 2 ; Nr. 8, no. 2 (2012-04-20), S.815-829 |
| Datensatznummer |
250005486
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| Publikation (Nr.) |
 copernicus.org/cp-8-815-2012.pdf |
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| Zusammenfassung |
| In most cases, gauged river flow records in southern South America extend
for only a few decades, hampering the detection of long-term, decadal to
centennial-scale cycles and trends. Long streamflow series can be
reconstructed from tree-ring records, offering the opportunity of extending
the limited hydrological instrumental data to several centuries. In northern
Patagonia, Argentina, the Neuquén River has great importance for local
and national socio-economic activities such as hydroelectric power
generation, agriculture and tourism. In this study, new and updated
tree-ring chronologies from Araucaria araucana and Austrocedrus chilensis are used to reconstruct the October–June
mean streamflow for the Neuquén River and place the period of gauged
flows (1903–2009), in a long-term, multi-century context. The
reconstruction covers the period 1346–2000 AD and was developed from a
network of 43 tree-ring chronologies, 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 in the last 654 yr, but longer and more severe
events were recorded in previous centuries. Blackman-Tukey and singular
spectral analyses identified quasiperiodic oscillations from 3.5 to 17.5 yr.
A dominant 6.8-yr cycle explains ca. 23.6% of the total variance
in the Neuquén River streamflow reconstruction. Correlation analyses
showed that discharges of the Neuquén River are related to variations in
the Southern Annular Mode (SAM), a measure of air mass exchanges between
middle and high latitudes in the Southern Hemisphere. This association is
consistent with previous studies that indicate a strong correlation between
rainfall in northern Patagonia and SAM variations. |
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