Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes

Zorzut, Valentina; Ruiz, Lucas; Rivera, Andrés; Pitte, Pierre; Villalba, Ricardo; Medrzycka, Dorota

doi:10.1017/jog.2020.64

Cited by 15 publications

(8 citation statements)

References 30 publications

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“…De todos los métodos analizados, el de caja variable es el único que permite capturar potenciales cambios en la relación longitud-área para el glaciar Alerce a lo largo del período estudiado. Por lo anterior, con este método es posible realizar estimaciones de área, y por consiguiente de volumen (Zorzut et al, 2020), utilizando únicamente los datos de posición del frente. Además, es posible ajustar estas estimaciones según la morfología del glaciar.…”

Section: Variaciones En La Relación De Longitud Y áRea Del Glaciar Al...unclassified

Fluctuaciones recientes del glaciar Alerce (1953-2020), Andes de Patagonia norte

Ghilardi Truffa,

Ruiz,

Pitte

et al. 2024

andgeo

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In recent decades, glacier retreat has been observed in all the world’s mountain ranges. Over the last 20 years, glaciers in the Andes have lost mass at one of the highest rates on record. Particularly, glaciers in the northern Patagonian Andes show the highest rate of loss of all the Andean regions for the last decade. Detailed records of long-term variations in glacier extent are crucial to put current climate change into context and quantify its impact on mountain areas. In the present study, a reconstruction of the extension (length and area) of the Alerce glacier (41.15° S-71.81° W) for the last 70 years was carried out. By means of historical documents and satellite images (Landsat and Pléiades), detailed maps of glacier fluctuations were generated for the period 1953-2020. Four methodologies were evaluated to measure the front position: i) central flow line; ii) curvilinear box; iii) multiline; and iv) variable box. The magnitude of the front position variations depends on the methodology applied. The method that best addresses glacier front variations over the period analyzed is the variable box method. Between 1953 and 2020, the Alerce glacier lost 35% of its area (1.1±0.1 km2) and 67% of its total length (1.49±0.04 km). It is possible to distinguish periods with different rates of retreat. A stage of slight retreat (-11.3±0.5 ma-1) between 1953 and 1976, followed by a period of stability (-6.7±0.5 ma-1) between 1977 and 1983, then a strong retreat (-58.7±0.5 ma-1) between 1984 and 1999, followed by another period of stability (-5.4±0.5 ma-1) between 2000 and 2009 and, finally, another retreat (-8.7±0.5 ma-1) between 2010 and 2020. The retreat rates for the Alerce glacier mimic those observed in other glaciers in the region, possibly representing a regional climatic signal.

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Section: Variaciones En La Relación De Longitud Y áRea Del Glaciar Al...unclassified

Fluctuaciones recientes del glaciar Alerce (1953-2020), Andes de Patagonia norte

Ghilardi Truffa,

Ruiz,

Pitte

et al. 2024

andgeo

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“…Recently, Zorzut et al (2020) calculated the ice thickness distribution of Monte Tronador glaciers and found that the gently sloped debris-covered tongue of the Verde glacier is one of the thicker parts of the whole glaciers of Monte Tronador, with a maximum estimated thickness of around 180 ± 60 m and a total volume of 0.59 ± 0.2 km 3 .…”

Section: Regional Context and Area Of Interestmentioning

confidence: 99%

Spatio-Temporal Distribution of Supra-Glacial Ponds and Ice Cliffs on Verde Glacier, Chile

Loriaux¹,

Ruiz²

2021

Front. Earth Sci.

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Known for their important role in locally enhancing surface melt, supraglacial ponds and ice cliffs are common features on debris-covered glaciers. We use high resolution satellite imagery to describe pond-cliff systems and surface velocity on Verde debris-covered glacier, Monte Tronador, and Southern Chile. Ponds and ice cliffs represent up to 0.4 and 2.7% of the glacier debris-covered area, respectively. Through the analyzed period and the available data, we found a seasonality in the number of detected ponds, with larger number of ponds at the beginning of the ablation season and less at the end of it. Using feature tracking, we determined glacier surface velocity, finding values up to 55 m/yr on the upper part of the debris-covered area, and decreasing almost to stagnation in the terminus. We found that larger ponds develop in glacier zones of low velocity, while zones of high velocity only contain smaller features. Meanwhile, ice cliffs appeared to be less controlled by surface velocity and gradient. Persistent ice cliffs were detected between 2009 and 2019 and backwasting up to 24 m/yr was measured, highlighting significant local glacier wastage.

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“…Besides the ice thickness, GPR and RES also provide bedrock topography description, which influences glacier hydrology (Grabiec et al, 2012). Furthermore, bedrock topography is a necessary constraint for developing numerical glacier-flow and rheological models (Faillettaz et al, 2012;Zorzut et al, 2020). It is well known that bedrock geometry determines glacier surface morphology (Paterson, 1994).…”

Section: Introductionmentioning

confidence: 99%

Evidences of Bedrock Forcing on Glacier Morphodynamics: A Case Study in Italian Alps

Dematteis

Giordan

Perret³

et al. 2022

Front. Earth Sci.

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In mountain glaciers, the influence of bedrock geometry on glacier surface morphology is often assumed; quantitative evidence, however, is rare. In our research, we measured the ice thickness of the Planpincieux Glacier (North-west Italy) and detected the bedrock topography using ground-penetrating radar. Additionally, we investigated the glacier surface morphology using structure from motion and the glacier kinematics using digital image correlation of terrestrial images. A digital terrain analysis showed evidence of recurrent crevasses whose position corresponded to bedrock steps. On average, since 2014, their positions varied between 6 and 14 m and were 40 ± 8 m downstream of the bedrock steps. Bedrock and glacier topography presented out-of-phase correlated undulations that approximately fit a sinusoidal function of different amplitude. Moreover, we show the morphological evolution of an unstable sector whose thickness at the end of the ablation seasons has remained approximately constant since 2014. Contrarily, the ice melting during the 2020 ablation season caused a volume loss of >30%. Since, in general, the damages provoked by a potential ice avalanche depend primarily on the involved volume, this finding demonstrates that frequent morphology monitoring is essential for correct glacial hazard assessment.

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Slope estimation influences on ice thickness inversion models: a case study for Monte Tronador glaciers, North Patagonian Andes

Cited by 15 publications

References 30 publications

Fluctuaciones recientes del glaciar Alerce (1953-2020), Andes de Patagonia norte

Fluctuaciones recientes del glaciar Alerce (1953-2020), Andes de Patagonia norte

Spatio-Temporal Distribution of Supra-Glacial Ponds and Ice Cliffs on Verde Glacier, Chile

Evidences of Bedrock Forcing on Glacier Morphodynamics: A Case Study in Italian Alps

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