First insights on Lake General Carrera/Buenos Aires/Chelenko water balance

Zambrano, Gustavo José Deibler; Río, R. Abarca del; Crétaux, Jean-François; Reid, Brian

doi:10.5194/adgeo-22-173-2009

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…22 The air temperature (mean monthly minimum of 3-4 C; maximum of 17-18 C) is dominated by the ocean on the W and is locally affected by lakes in the interior. 23 Most soils in the region originate from volcanic rocks (basalts, andesites, rhyolites) and from continental and to a lesser extent marine sediments. The pattern of native vegetation is strongly linked to precipitation, temperature and soil features and is dominated by Nothofagus forests: evergreen N. betuloides in areas with high precipitation and humidity, deciduous N. antarctica and N. pumilio in the rest of the study area.…”

Section: Studymentioning

confidence: 99%

Baseline element composition of foliose and fruticose lichens along the steep climatic gradient of SW Patagonia (Aisén Region, Chile)

et al. 2012

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Samples of foliose (Nephroma antarcticum) and fruticose (Usnea sp.) lichens were collected across a steep climatic and vegetation gradient in a remote, almost pristine region of SW Chilean Patagonia. Concentrations of major and trace elements in lichens from the rainforest were among the lowest ever reported worldwide for foliose and fruticose lichens and can be considered background levels for the region. The two lichen growth forms showed different elemental compositions mainly due to the greater capacity of foliose thalli to intercept elements from windborne and canopy-leached particles. The patterns of spatial variation in the chemical composition of lichens were effectively explained by statistical methods and reflected the different availability of wet and dry deposition along the steep climatic gradient. Baseline values established for N. antarcticum samples growing in temperate Nothofagus forests were therefore distinct from those of samples growing in more open, drier habitats. The fruticose Usnea sp. showed a higher affinity for atmophile Hg, low concentrations of lithophilic elements, and the same baseline composition whether from temperate forests or from dry, barren environments. The provided background and baseline values against which variations can be measured will be useful in the early detection of local or regional climatic and environmental change, especially in view of the planned construction of hydropower dams under the recently approved HidroAysén Project.

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Section: Studymentioning

confidence: 99%

Baseline element composition of foliose and fruticose lichens along the steep climatic gradient of SW Patagonia (Aisén Region, Chile)

et al. 2012

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“…(2013). Evapotranspiration is negligible with regards to discharge levels (Zambrano et al., 2009), and the similarities between quickflow and rainfall validated the sub‐division of total discharge into two components.…”

Section: Methodsmentioning

confidence: 97%

“…To do this separation, we applied the Lyne and Hollick filter (Lyne & Hollick, 1979) to the lower Baker River discharge data, following Ladson et al (2013). Evapotranspiration is negligible with regards to discharge levels (Zambrano et al, 2009), and the similarities between quickflow and rainfall validated the sub-division of total discharge into two components.…”

Section: Hydrological Datamentioning

confidence: 99%

Seasonal Variations in Fjord Sediment Grain Size: A Pre‐requisite for Hydrological and Climate Reconstructions in Partially Glacierized Watersheds (Baker River, Patagonia)

et al. 2022

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The Patagonian Andes constitute one of the most vulnerable regions to climate change. Over the last two decades, glacier elevation across the southern Andes decreased at a rate of 0.75 ± 0.23 m yr −1 -2016Dussaillant et al., 2019), reaching up to 1.00 ± 0.01 m yr −1 for the Northern Patagonian Icefield (NPI;-2015Braun et al., 2019). Although this net ice mass loss has affected the temperate glaciers of Patagonia since at least 1870 (Davies & Glasser, 2012), it has accelerated during the last c. 40 years in response to a drying trend caused by a southward shift of the westerly wind belt (Garreaud et al., 2013;Rasmussen et al., 2007

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“…Both lakes have a combined surface area of approx. 1900 km 2 (Zambrano et al 2009), and are located at an elevation of approx. 200 m a.s.l.…”

Section: Study Site Data Availability and Methodsmentioning

confidence: 99%

Hydrological regime of remote catchments with extreme gradients under accelerated change: the Baker basin in Patagonia

Dussaillant

Buytaert

Meier

et al. 2012

Hydrological Sciences Journal

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The Baker basin (27 000 km 2 ) is located in one of the most pristine and remote areas of the planet. Its hydrological regime is poised to undergo dramatic changes in the near future due to hydropower development and climate change. The basin contains the second-largest lake in South America, and part of a major icefield. This study documents the natural baseline of the Baker River basin, discusses the main hydrological modes and analyses the potential for sustainable management. Annual precipitation varies several-fold from the eastern Patagonian steppes to the North Patagonian Icefield. The westernmost sub-basins are strongly governed by glacier melt with a peak discharge in the austral summer (January-March). The easternmost sub-basins have a much more seasonal response governed by quicker snowmelt in spring (November-December), while they exhibit low flows typical for semi-arid regions during summer and autumn. Topography, vegetation and wetlands may also influence streamflow. The strong spatio-temporal gradients and variability highlight the need for further monitoring, particularly in the headwaters, especially given the severe changes these basins are expected to undergo. The great diversity of hydrological controls and climate change pose significant challenges for hydrological prediction and management.Key words natural flow regime; catchment classification; runoff ratio; climate change; hydropower; prediction in ungauged basins; Baker River; Patagonia Le régime hydrologique de bassins versants éloignés soumis à des gradients extrêmes et à de brusques changements: le bassin de Baker en Patagonie Résumé Le bassin de Baker (27 000 km 2 ) est situé dans une des zones les plus vierges et les plus isolées de la planète. Son régime hydrologique est sur le point de subir des modifications brutales en raison de projets hydroélec-triques et du changement climatique. Le bassin contient le deuxième plus grand lac d'Amérique du Sud, et une partie d'un important glacier. Cette étude décrit l'état naturel du bassin de la rivière Baker, les grands traits de son hydrologie et son potentiel de gestion durable. Les précipitations annuelles varient de plusieurs ordres de grandeur entre les steppes de Patagonie à l'Est et le glacier au Nord de la Patagonie. Les sous-bassins situés à l'Ouest sont fortement influencés par la fonte des glaciers avec un débit de pointe durant l'été austral (janvier-mars). Les sousbassins situés à l'Est ont une réponse beaucoup plus saisonnière régie par la fonte des neiges rapide au printemps (novembre-décembre), alors qu'ils présentent des étiages typiques des régions semi-arides en été et en automne. La topographie, la végétation et les zones humides peuvent également influencer l'écoulement fluvial. Les forts gradients spatio-temporels et l'importante variabilité mériteraient un suivi accru, en particulier dans les zones amont, compte tenu surtout des changements sévères que ces bassins doivent subir. La grande diversité des amé-nagements hydrologiques et le changement climatique po...

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First insights on Lake General Carrera/Buenos Aires/Chelenko water balance

Cited by 5 publications

References 13 publications

Baseline element composition of foliose and fruticose lichens along the steep climatic gradient of SW Patagonia (Aisén Region, Chile)

Baseline element composition of foliose and fruticose lichens along the steep climatic gradient of SW Patagonia (Aisén Region, Chile)

Seasonal Variations in Fjord Sediment Grain Size: A Pre‐requisite for Hydrological and Climate Reconstructions in Partially Glacierized Watersheds (Baker River, Patagonia)

Hydrological regime of remote catchments with extreme gradients under accelerated change: the Baker basin in Patagonia

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