Variability in subtropical Andean Argentinean Atuel river; a wavelet approach

Compagnucci, Rosa Hilda; Blanco, Susana; Figliola, M. Alejandra; Jacovkis, Pablo M.

doi:10.1002/(sici)1099-095x(200005/06)11:3<251::aid-env405>3.0.co;2-0

Cited by 33 publications

(17 citation statements)

References 21 publications

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“…Among the different techniques widely used nowadays, wavelet and multi-resolution [11,16,29] analyses propose a time-scale transformation of the signal that accounts for flow variability. These methods have already been applied in different fields of hydrology ( [9,14,22,23,[25][26][27] and references therein).…”

Section: Reconstruction Methods Of the Monthly River Dischargessupporting

confidence: 91%

Evidence for global runoff increase related to climate warming

LABAT

2004

Advances in Water Resources

112

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Ongoing global climatic change initiated by the anthropogenic release of carbon dioxide is a matter of intense debate. We focus both on the impact of these climatic changes on the global hydrological cycle and on the amplitude of the increase of global and continental runoff over the last century, in relation to measured temperature increases. In this contribution, we propose an original statistical wavelet-based method for the reconstruction of the monthly discharges of worldwide largest rivers. This method provides a data-based approximation of the evolution of the annual continental and global runoffs over the last century. A consistent correlation is highlighted between global annual temperature and runoff, suggesting a 4% global runoff increase by 1°C global temperature rise. However, this global trend should be qualified at the regional scale where both increasing and decreasing trends are identified. North America runoffs appear to be the most sensitive to the recent climatic changes. Finally, this contribution provides the first experimental data-based evidence demonstrating the link between the global warming and the intensification of the global hydrological cycle. This corresponds to more intense evaporation over oceans coupled to continental precipitation increase or continental evaporation decrease. This process finally leads to an increase of the global continental runoff.

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Section: Reconstruction Methods Of the Monthly River Dischargessupporting

confidence: 91%

Evidence for global runoff increase related to climate warming

LABAT

2004

Advances in Water Resources

112

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“…5a). This relationship between ENSO and the hydroclimate in the northern subregion is congruent with previous studies relating ENSO with precipitation over central Chile (Escobar and Aceituno 1998;Montecinos and Aceituno 2003;Garreaud et al 2009), with streamflow variability in Chile (Aceituno and Vidal 1990;Aceituno and Garreaud 1995;Muñoz et al 2016) and Argentina (Compagnucci et al 2000), and with snowpack accumulation in the central Andes (Masiokas et al 2006). In particular, the relationship between ENSO in the northern subregion and precipitation could explain the positive trend between 1975 and 2000 reported in several studies (Carrasco et al 2005;Quintana and Aceituno 2012).…”

Section: Discussionmentioning

confidence: 77%

Spatiotemporal Variations in Hydroclimate across the Mediterranean Andes (30°–37°S) since the Early Twentieth Century

González‐Reyes

McPhee

Christie

et al. 2017

Journal of Hydrometeorology

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In the Mediterranean Andes region (MA; 308-378S), the main rivers are largely fed by melting snowpack and provide freshwater to around 10 million people on both sides of the Andes Mountains. Water resources in the MA are under pressure because of the extensive development of industrial agriculture and mining activities. This pressure is increasing as the region faces one of its worst recorded droughts. Previous studies have pointed to El Niño-Southern Oscillation (ENSO) as the main climatic force impacting the MA. However, the role of decadal and multidecadal climate variability, their spatial patterns, and the recurrence of long-term droughts remains poorly studied. In an attempt to better understand these factors, spatial and temporal patterns of hydroclimatic variability are analyzed using an extensive database of streamflow, precipitation, and snowpack covering the period between 1910 and 2011. These analyses are based on the combination of correlation, principal components, and kernel estimation techniques. Despite a general common pattern across the MA, the results presented here identify two hydroclimatic subregions, located north and south of 348S. While the interannual variability associated with ENSO is slightly stronger north of 348S, the variability associated with the Pacific decadal oscillation (PDO) and/or the interdecadal Pacific oscillation (IPO) index shows similar patterns in both regions. However, variations produced by the IPO forcing seem to be greater in the southern subregion since 1975. The estimations presented here on drought recurrence reveal a generalized increase in dry extremes since the 1950s. These findings suggest that the northern MA is more vulnerable to changes in hydrology and climate than the southern MA.

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“…At interannual scales, a 4-6-year oscillation remain restricted to Oyapock and San Juan annual discharge records and may be directly related to ENSO mode intertwined with both Pacific and Atlantic teleconnections [10,49,4,6,2,59]. A near-decadal 11-13-year oscillation constitutes the main variability in the southern part of the continent.…”

Section: South America Rivers Discharge Variabilitymentioning

confidence: 99%