El niño driven climate variability and drainage anomalies in Patagonian region Argentina

Scarpati, Olga Eugenia; Spescha, Liliana Beatriz; Fioriti, M. J.; Capriolo, Alberto Daniel

doi:10.18172/cig.1122

Cited by 4 publications

(1 citation statement)

References 5 publications

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“…Previous studies have reported significant relationships between ENSO and mean annual discharges of the Neuquén River (Scarpati et al, 2001;Seoane et al, 2005). However, the comparison between pre-whitened variations of both ENSO and October-June Neuquén River flow (both observed and reconstructed records) reveals positive, but not statistically significant correlations between these variables.…”

Section: Discussionmentioning

confidence: 94%

Multi-century tree-ring based reconstruction of the Neuquén River streamflow, northern Patagonia, Argentina

Mundo¹,

Masiokas²,

Villalba³

et al. 2011

Preprint

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Abstract. In most cases, gauged river flow records in southern South America exist 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 for several centuries or millennia. 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 through a nested principal components regression approach using a network of 43 tree-ring chronologies grouped in composite series. 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 past millennium, but longer and more severe events can also be observed in previous centuries. Blackman-Tukey and Singular Spectral Analyses identified various multi-decadal quasiperiodic oscillations with a dominant 6.8-year cycle explaining ca. 23.6% of the total variance in the Neuquén River streamflow reconstruction. We also found that the Neuquén River discharges 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 which indicate a strong connection between rainfall patterns in northern Patagonia and SAM activity.

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Section: Discussionmentioning

confidence: 94%

Multi-century tree-ring based reconstruction of the Neuquén River streamflow, northern Patagonia, Argentina

Mundo¹,

Masiokas²,

Villalba³

et al. 2011

Preprint

View full text Add to dashboard Cite

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Spatio-temporal assessment of streamflow droughts over Southern South America: 1961–2006

Rivera

Penalba

2017

Theor Appl Climatol

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Regional aspects of streamflow droughts in the Andean rivers of Patagonia, Argentina. Links with large-scale climatic oscillations

et al. 2017

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Under the current global warming trend, droughts are expected to increase, with serious implications for water resources management. This study analyzed the regional aspects of droughts in terms of streamflow deficiencies over the Andean rivers of Patagonia, Argentina. Based on the variable threshold level method, the main characteristics of streamflow droughts were obtained for the hydrological years 1962/63-2014/15, considering three different severity levels over 11 representative basins. Two distinct regional behaviors were identified in terms of temporal variations of streamflow drought duration and its cumulative deficit volume, dividing the study area into North and Central Patagonia. The effects of the Southern Annular Mode (SAM), the El Niño-Southern Oscillation (ENSO), and the Pacific Decadal Oscillation (PDO) on the interannual and interdecadal variability of streamflow droughts were assessed through an empirical decomposition applied to the regional time series. These large-scale climatic oscillations have a distinct regional and temporal behavior in terms of the modulation of streamflow drought variability. Considering the interannual streamflow drought variability, the El Niño signal is more consistent and contributes with humid conditions, especially over North Patagonia. The multi-decadal component of the streamflow drought time series is linked to the upward trend in SAM, particularly over Central Patagonia.

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El niño driven climate variability and drainage anomalies in Patagonian region Argentina

Cited by 4 publications

References 5 publications

Multi-century tree-ring based reconstruction of the Neuquén River streamflow, northern Patagonia, Argentina

Multi-century tree-ring based reconstruction of the Neuquén River streamflow, northern Patagonia, Argentina

Spatio-temporal assessment of streamflow droughts over Southern South America: 1961–2006

Regional aspects of streamflow droughts in the Andean rivers of Patagonia, Argentina. Links with large-scale climatic oscillations

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