Tree-ring based reconstruction of Río Bermejo streamflow in subtropical South America

Ferrero, María Eugenia; Villalba, Ricardo; Membiela, Mónica de; Hidalgo, Lidia Ferri; Luckman, Brian H.

doi:10.1016/j.jhydrol.2015.04.004

Cited by 40 publications

(17 citation statements)

References 42 publications

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“…In addition, interdecadal variability of around 15 years has been observed in the SACZ (and river flows in La Plata basin) by Robertson and Mechoso (2000). In line with these observations, a tree-ring based river flow reconstruction from NWA shows an oscillation mode centered at 14 years that explains 12.4% of the river flow variability over the last 300 years (Ferrero et al, 2015).…”

Section: Discussionsupporting

confidence: 67%

“…Discharges from these rivers cross throughout 1,200 km the semiarid lands in the Chaco region to join the major tributaries in La Plata basin. The main rivers in La Plata basin (Paraguay, Paraná, Uruguay) as well as important tributaries (Bermejo, Salado, Iguazú) have increased their mean flows since the mid-1970s, as well as the frequency of extreme discharges events (Barros et al, 2015;Ferrero et al, 2015). This increase up to 20-35% in annual discharges continued during the 1990s with a reduction at the beginning of the 20th century; however, most current river discharges are well-above those recorded before the 1950s.…”

Section: Introductionmentioning

confidence: 99%

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Interannual and Long-Term Precipitation Variability Along the Subtropical Mountains and Adjacent Chaco (22–29° S) in Argentina

Ferrero

Villalba

2019

Front. Earth Sci.

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Recent studies documenting climate variability in South America have provided valuable information for understanding current and past dynamics of the climate system. Long meteorological records represent an essential tool to properly characterize climate fluctuations from decadal to multi-decadal scales. Unfortunately, the scarcity of continuous and homogeneous instrumental records is a major constraint to determine long-term variations in South America. Our knowledge of the forcings modulating the hydrological variability in mountains is still limited, despite their importance as freshwater sources for people living in the adjacent piedmonts and lowlands. The objective of this work is to determine the spatial-temporal variability of precipitation in the humid subtropical Andes and the Chaco region in North Western Argentina (NWA). Thirtyfour rainfall records covering the common period 1934-1990, partially updated to 2016, were used to extend and identify the dominant patterns of seasonal to annual hydroclimatic variability based on principal components analysis. Intensity and frequency of droughts and pluvials (<5th and >95th percentiles, respectively) were determined for the dominant patterns of variability. Our results show a positive trend in precipitation since 1970s in all temporal patterns and sub-regions. In addition, precipitation variability (both positive and negative extremes) increases during these last decades. Correlation analysis with sea-surface temperatures and wind anomalies during summer, reveal Amazon moisture sources and large-scale oceanic controls on NWA precipitation. The extended precipitation series shows that the frequency of pluvials has increased since the 1970s interrupted by few extreme droughts. This record can be considered representative of precipitation variations across NWA, including different environments in the Chaco, sub-Andes, and Puna.

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Section: Discussionsupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Interannual and Long-Term Precipitation Variability Along the Subtropical Mountains and Adjacent Chaco (22–29° S) in Argentina

Ferrero

Villalba

2019

Front. Earth Sci.

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“…This reconstruction offers a new long-term perspective for the entire Mediterranean region in Chile. A relevant feature of our reconstruction is the retained variance, having the highest explained variance of any streamflow reconstruction in South America (56% of total variance), and contrasting previous river reconstructions carried out in several South American rivers by authors as: Mundo et al [45], Lara et al [46,47], Urrutia et al [48], Ferrero et al [49], Muñoz et al [37], Barria et al [13,50], and Fernandez et al [51]. In statistical terms, the RE of the reconstruction was 0.53 considered good and a little higher than the other streamflow reconstructions in South America.…”

Section: The 700 Years Of Petorca River Streamflow Reconstruction Andmentioning

confidence: 51%

Water Crisis in Petorca Basin, Chile: The Combined Effects of a Mega-Drought and Water Management

Muñoz

Klock-Barría

Álvarez-Garretón

et al. 2020

Water

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Since 2010, Chile has experienced one of the most severe droughts over the last century, the so-called mega-drought (MD). The MD conditions, combined with intensive agricultural activities and the current water management system, have led to water scarcity problems in Mediterranean and Semi-arid regions of Chile. An emblematic case is the Petorca basin, where a water crisis is undergone. To characterize this crisis, we analyzed water provision by using tree-ring records, remote sensing, instrumental data, and allocated water rights within the basin. Results indicate that the MD is the most severe dry period over the last 700-years of streamflow reconstruction. During the MD, streamflow and water bodies of the upper parts of the basin have been less affected than mid and low areas of this valley, where consumptive withdrawals reach up to 18% of the mean annual precipitation. This extracted volume is similar to the MD mean annual precipitation deficits. The impacts of the current drought, along with the drier climate projections for Central Chile, emphasize the urgency for faster policy changes related to water provision. Climate change adaptation plans and policies should enhance the current monitoring network and the public control of water use to secure the water access for inhabitants and productive activities.

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“…Paleoclimatic studies indicate that in Northern Chile (north of 30° S) there was an absence of heavy rainfalls between 8400 and 5300 years BP in conjunction to a decrease in ENSO activities at the Eastern Pacific Ocean (Ortega et al 2012). Based on tree rings from the Bermejo River region, it was stated that for the last three centuries there was significant increments in the frequency, intensity and duration of floods and droughts since the second half of the 20 th century (Ferrero et al 2015). The last five extreme wet events occurred since 1814, the last three in the last 40 years.…”

Section: Discussionmentioning

confidence: 99%

ENSO-triggered floods in South America: correlation between maximum monthly discharges during strong events

Isla

2018

Preprint

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Tree-ring based reconstruction of Río Bermejo streamflow in subtropical South America

Cited by 40 publications

References 42 publications

Interannual and Long-Term Precipitation Variability Along the Subtropical Mountains and Adjacent Chaco (22–29° S) in Argentina

Interannual and Long-Term Precipitation Variability Along the Subtropical Mountains and Adjacent Chaco (22–29° S) in Argentina

Water Crisis in Petorca Basin, Chile: The Combined Effects of a Mega-Drought and Water Management

ENSO-triggered floods in South America: correlation between maximum monthly discharges during strong events

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