Large-Scale Climate Variability Patterns and Drought: A Case of Study in South – America

Oñate-Valdivieso, Fernando; Uchuari, Veronica; Oñate-Paladines, Arianna

doi:10.1007/s11269-020-02549-w

Cited by 30 publications

(15 citation statements)

References 38 publications

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“…In 175Ecuador, the strong connection between PDO and ENSO is evident mainly in the warm phase, when rainfall is above average. This influence is also observable during drought periods, with ~70% of droughts developing in the negative PDO phase (Oñate-Valdivieso et al, 2020).…”

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confidence: 88%

Relationships between Andean Glacier Ice-Core Dust Records and Amazon Basin Riverine Sediments

Reis

Ribeiro

Delmonte

et al. 2021

Preprint

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Abstract. Dust particle studies in ice cores from the tropical Andes provide important information about climate dynamics. We investigated dust concentrations from a 22.7 m ice-core recovered from the Quelccaya Ice Cap (QIC) in 2018, representing 12 years of snow accumulation. The dust seasonality signal was still preserved with some homogenization of the record due to surface melting and percolation. Using a microparticle counter, we measured the dust concentration from 2–60 µm and divided the annual dust concentration into three distinct groups: fine particle percentage (FPP, 2–10 µm), coarse particle percentage (CPP, 10–20 μm) and giant particle percentage (GPP, 20–60 μm). Increased dust was associated with the warm stage of the Pacific Decadal Oscillation index (PDO) from 2014–2017 with significant increases in FPP and a relative decrease in GPP. There was a positive correlation between PDO and FPP (r = 0.68, p-value < 0.02). CPP and GPP were dominant during the PDO cold phase (2005–2013) and were more strongly associated with the Tropical Northern Atlantic index (TNA), which was positive from 2005–2017. The relation between TNA and CPP was r = 0.60 (p-value < 0.05) and that with GPP was r = 0.59 (p-value < 0.05). We also revealed a potential link between QIC dust and Madeira River sediments and runoff. Sediment concentration decreases at Porto Velho station were correlated with %GPP (r = 0.67, p < 0.02) from 2005–2017. This relationship contributes to a better understanding of the effects of PDO oscillations on both parameters. The %GPP and sediment decreases were potentially linked with the PDO phase change from negative to positive. We also noted a strong negative correlation between FPP and runoff (r = −0.80, p < 0.002) from 2005–2016, which was understandable due to the relationship of FPP to wetter conditions while runoff decreases were associated with increasing dryness in the southern part of the Madeira Basin. Assessing dust record variability by distinct size groups can help to improve our knowledge of how the Pacific and Atlantic oceans influence atmospheric oscillations in the QIC. In addition, the association of dust variability with dynamic changes in sediments and runoff in the Madeira River system demonstrates the potential for future investigation of linkages between QIC dust and Amazon basin rivers.

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confidence: 88%

Relationships between Andean Glacier Ice-Core Dust Records and Amazon Basin Riverine Sediments

Reis

Ribeiro

Delmonte

et al. 2021

Preprint

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“…In 175 Ecuador, the strong connection between PDO and ENSO is evident mainly in the warm phase, when rainfall is above average. This influence is also observable during drought periods, with ~70% of droughts developing in the negative PDO phase (Oñate-Valdivieso et al, 2020).…”

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confidence: 88%

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2021

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“…To identify key variables, a cross impacts matrix was applied [28], but using a different scale than the tradi- The basin's climate is cold temperate mesothermal [20], characterized by an average annual temperature between 1047 mm. The wet season occurs from December to May and the dry season from June to November [21].…”

Section: Prospective Analysismentioning

confidence: 99%

Territorial Prospective to Sustainability: Strategies for Future Successful of Water Resource Management on Andean Basins

Mera-Parra

Massa-Sánchez

Oñate-Valdivieso

et al. 2022

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In Latin America, water resource management in some areas is difficult when all parts of a system are not considered (including its dynamism). Therefore, it becomes necessary to prepare instruments that facilitate management using a comprehensive approach. This study aimed to develop a methodology that allows one to conduct a prospective analysis of water management over delimited territories. The Zamora Huayco basin was chosen as the study area. This work included a survey of physical-natural, socioeconomic, and political-institutional variables, as well as a system structural analysis. Also, the generation of future scenarios and the strategic and tactical orientation for the integrated management of water resources. The results show that, of the 23 variables used, 19 were classified as key system variables. Most of the variables had strong impacts on each other, but at the same time these were highly receptive to changes. The behavior of change, proposed for the different uses and land cover in the basin for 2029, was considered as the objective scenario, highlighting the gain in forest areas and shrub vegetation. The strategic plans proposed in this methodology consider the structuring and collecting information in a single repository, creating communication channels between stakeholders and decision-makers.

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Large-Scale Climate Variability Patterns and Drought: A Case of Study in South – America

Cited by 30 publications

References 38 publications

Relationships between Andean Glacier Ice-Core Dust Records and Amazon Basin Riverine Sediments

Relationships between Andean Glacier Ice-Core Dust Records and Amazon Basin Riverine Sediments

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Territorial Prospective to Sustainability: Strategies for Future Successful of Water Resource Management on Andean Basins

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