The Alpine LGM in the boreal ice-sheets game

Monegato, Giovanni; Scardia, Giancarlo; Hajdas, Irka; Rizzini, F.; Piccin, Andrea

doi:10.1038/s41598-017-02148-7

Cited by 128 publications

(134 citation statements)

References 48 publications

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“…Alpine ice flow patterns were primarily controlled by subglacial topography, but there is evidence for flow accross major mountain passes (e.g., Coutterand, 2010;Kelly et al, 2004;van Husen, 2011), and self-sustained ice domes (Bini et al,30 2009). Finally, the timing of the LGM in the Alps (Ivy-Ochs et al, 2008;Monegato et al, 2017) is in good agreement with the maximum expansion of continental ice sheets recorded by the Marine Oxygen Isotope Stage (MIS) 2 (29-14 ka; Lisiecki and Raymo, 2005). Regional variation between different piedmont lobes exists (Wirsig et al, 2016, Fig.…”

Section: Introductionsupporting

confidence: 59%

“…Regional variation between different piedmont lobes exists (Wirsig et al, 2016, Fig. 5), but it is unclear whether this relates to climate or glacier dynamics (Monegato et al, 2017) or uncertainties in the dating methods.…”

Section: Introductionmentioning

confidence: 99%

“…Geological data from the best documented Alpine piedmont lobes indicate that their maximum extension during MIS 2 occurred at around 25.5-24.0 ka (Monegato et al, 2017), after which Alpine glaciers remained or potentially re-advanced to within close reach of this maximum extent, until as late as 22 to 17 ka (Ivy-Ochs, 2015;Wirsig et al, 2016, Fig. 5).…”

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confidence: 99%

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Modelling last glacial cycle ice dynamics in the Alps

Seguinot¹,

Jouvet²,

Huss³

et al. 2018

Preprint

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Abstract.The European Alps, cradle of pioneer glacial studies, are one of the regions where geological markers of past glaciations are most abundant and well-studied. Such conditions make the region ideal for testing numerical glacier models based on simplified ice flow physics against field-based reconstructions, and vice-versa.Here, we use the Parallel Ice Sheet Model (PISM) to model the entire last glacial cycle (120-0 ka) in the Alps, using 5 horizontal resolutions of 2 and 1 km and up to 576 processors. Climate forcing is derived using present-day climate data from WorldClim and the ERA-Interim reanalysis, and time-dependent temperature offsets from multiple palaeo-climate proxies, among which only the EPICA ice core record yields glaciation during marine oxygen isotope stages 4 (69-62 ka) and 2 (34-18 ka) spatially and temporally consistent with the geological reconstructions, while the other records used result in excessive early glacial cycle ice cover and a late Last Glacial Maximum. Despite the low variability of this Antarctic-based climate 10 forcing, our simulation depicts a highly dynamic ice sheet, showing that Alpine glaciers may have advanced many times over the foreland during the last glacial cycle. Ice flow patterns during peak glaciation are largely governed by subglacial topography but include occasional transfluences and self-sustained ice domes. Modelled maximum ice surface is 861 m higher than observed trimline elevations in the upper Rhone Valley, yet our simulation predicts little erosion at high elevation due to cold-based ice. Finally, the Last Glacial Maximum advance, often considered synchronous, is here modelled as a time-15 transgressive event, with some glacier lobes reaching their maximum as early as 27 ka, and some as late as 21 ka.

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Section: Introductionsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Modelling last glacial cycle ice dynamics in the Alps

Seguinot¹,

Jouvet²,

Huss³

et al. 2018

Preprint

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“…This culmination took place between 26.5–23 ka; this is in agreement with the chronology available from other end‐moraine systems in the Alps (Monegato et al . , ; Ivy‐Ochs et al . ) that point to a maximum extent during Greenland Stadial 3 (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…; Orta: this work; Garda after Monegato et al . ; Rhine after Preusser et al . ; Tagliamento after Monegato et al .…”

Section: Discussionmentioning

confidence: 99%

Timing and flow pattern of the Orta Glacier (European Alps) during the Last Glacial Maximum

Braakhekke

Ivy‐Ochs

Monegato

et al. 2020

Boreas

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Knowledge of the glacial chronologies for the Last Glacial Maximum (LGM) helps in understanding the interactions between climate, topography and glacier development. In this sense, the investigation of the Lake Orta moraine amphitheatre (Alpine foreland, northern Italy) allowed spatial and temporal reconstruction of the Orta Glacier. The end‐moraine system was investigated by means of geomorphological field surveys, analysis of 13 rock samples for cosmogenic 10Be and 36Cl concentrations, and remote sensing analysis. The dating results indicate that the age of the outer moraine belt is concordant with the LGM culmination at 26.5–23 ka, as found in other amphitheatres in the Alps. This new age estimate of the outermost moraines shows that the maximum extent of the Orta Glacier during the LGM was significantly bigger than recently suggested. A younger stabilization phase of the glacier front at about 19 ka indicates that the onset of the withdrawal of glaciers from the lower Alpine valleys started later. Provenance analysis of the boulders shows that the greatest contribution of ice to the Orta Glacier came from the Anzasca Valley rather than the major Ossola Valley. This reflects the closeness (about 45 km) to the foreland of the high‐elevated accumulation area of the Monte Rosa massif (4634 m a.s.l.), whose eastern glacier seems to have reached the lower valley faster than the trunk Toce Glacier. This fact underlines the key role played by high‐elevation accumulation areas that are located close to the foreland in controlling the path and geometry of major glaciers in the Alps.

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Exploring late Paleolithic and Mesolithic diet in the Eastern Alpine region of Italy through multiple proxies

Oxilia

Bortolini

Badino

et al. 2020

American J Phys Anthropol

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Objectives: The analysis of prehistoric human dietary habits is key for understanding the effects of paleoenvironmental changes on the evolution of cultural and social human behaviors. In this study, we compare results from zooarchaeological, stable isotope and dental calculus analyses as well as lower second molar macrowear patterns to gain a broader understanding of the diet of three individuals who lived between the end of the Late Pleistocene and the Early Holocene (ca., 17-8 ky cal BP) in the Eastern Alpine region of Italy. Materials and methods: We analyze individuals buried at the sites of Riparo Tagliente (Verona), Riparo Villabruna, and Mondeval de Sora (Belluno). The three burials provide

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The Alpine LGM in the boreal ice-sheets game

Cited by 128 publications

References 48 publications

Modelling last glacial cycle ice dynamics in the Alps

Modelling last glacial cycle ice dynamics in the Alps

Timing and flow pattern of the Orta Glacier (European Alps) during the Last Glacial Maximum

Exploring late Paleolithic and Mesolithic diet in the Eastern Alpine region of Italy through multiple proxies

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