Tancrède Leger

Tancrède Leger
The University of Sheffield | Sheffield · Department of Geography

BSc. PhD. GeoSciences
Research Associate

About

14
Publications
1,854
Reads
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22
Citations
Citations since 2017
14 Research Items
22 Citations
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Introduction
My strong desire to better understand the cryosphere has driven my research to specialise towards the study of glacial environments' response to past, current and future climate change. Using both field-based data and numerical modelling investigations, my current work focuses on producing detailed reconstructions of Quaternary glacier evolution in Greenland, Patagonia, Peru and the French Alps as proxies of past climate change. More info: https://sites.google.com/view/tancrede-leger
Education
September 2018 - February 2022
The University of Edinburgh
Field of study
  • School of GeoSciences, Cryosphere research group
July 2016 - July 2017
University of Otago
Field of study
  • Geography, Earth-Sciences
September 2014 - May 2018
University of Glasgow
Field of study
  • Geography, Earth-Sciences

Publications

Publications (14)
Article
Full-text available
The precise environmental mechanisms controlling Quaternary glacial cycles remain ambiguous. To address this problem, it is critical to better comprehend the drivers of spatio-temporal variability in ice-sheet evolution by establishing reliable chronologies of former outlet-glacier advances. When spanning multiple glacial cycles, such chronologies...
Presentation
Full-text available
Cordillera Blanca glaciers represent the greatest glacial freshwater reserve in tropical South America and have been shrinking substantially over recent decades, posing a threat to future water resources in the Peruvian Ancash region. A crucial step to better understand the evolution of these glaciers under changing conditions is to establish robus...
Preprint
Full-text available
The precise environmental mechanisms controlling Quaternary glacial cycles remain ambiguous. To address this problem, it is critical to better comprehend the drivers of spatio-temporal variability in ice-sheet evolution by establishing reliable chronologies of former outlet-glacier advances. When spanning multiple glacial cycles, such chronologies...
Presentation
Full-text available
Here, we reconstruct the glacial history and chronology of a previously unstudied region of Patagonia that formerly hosted the Río Corcovado (43°S, 71°W) outlet glacier. We present a new set of cosmogenic 10Be and 26Al exposure ages from moraine boulders, ice-moulded bedrock surfaces, palaeo-shoreline surface cobbles and glaciofluvial outwash surfa...
Article
Full-text available
The last glacial termination was a key event during Earth's Quaternary history that was associated with rapid, high-magnitude environmental and climatic change. Identifying its trigger mechanisms is critical for understanding Earth's modern climate system over millennial timescales. It has been proposed that latitudinal shifts of the Southern Hemis...
Article
In southern South America, well-dated glacial geomorphological records constrain the last glacial cycle across much of the former Patagonian Ice Sheet, but its northeastern sector remains comparatively understudied and unconstrained. This knowledge gap inhibits our understanding of the timing of maximum glacier extent, the duration of the glacial m...
Preprint
Full-text available
We use a combination of geomorphological mapping, terrestrial cosmogenic nuclide exposure dating and glacial numerical modelling to reconstruct the late-Last Glacial Maximum (LGM) behaviour and surface mass balance of two mountain glaciers of northeastern Patagonia (43°S, 71°W), the El Loro and Río Comisario palaeo-glaciers. In both valleys, we fin...
Preprint
Full-text available
We here present 10Be surface exposure ages from five moraine sets along with Bayesian age modelling to reconstruct a detailed chronology of Last Glacial Maximum expansions of the Río Corcovado glacier, a major former ice conduit of northern Patagonia. We find that the outlet glacier reached maximum expansion of the last glacial cycle during the glo...
Presentation
This work presents the reconstruction of late LGM advances/still-stands of mountain glaciers in northeastern Patagonia using geomorphological mapping, 10Be surface exposure dating and glacier numerical modelling.
Article
Full-text available
This study presents the first detailed glacial geomorphological map of the sediment-landform assemblages formed by three eastern outlet glaciers of the former Patagonian Ice Sheet. These glaciers occupied the Río Corcovado, Río Huemul and Lago Palena/General Vintter valleys, Chubut province, Argentina (43°S, 71°W). By combining remote sensing and f...
Presentation
Display presenting preliminary geomorphological and geochronological results from northeastern Patagonia (PhD research).
Poster
Full-text available
A presentation of my PhD project, its motivations, research questions and objectives. This poster indicates the exact location of my field site within the wider Patagonian Ice Sheet context. It also highlights my sampling strategy and methodology for cosmogenic radionuclide dating of ice limits, as well as some interpretations resulting from geomor...

Network

Cited By

Projects

Project (1)
Project
This PhD investigation is an effort to reconstruct, for the first time, the Quaternary glacial geomorphology and geochronology in a valley system of northern Patagonia previously occupied by the the Rio Huemul and Rio Corcovado (43°S, 71°W) outlet glaciers. This geochronological reconstruction also aims at improving our understanding of past meltwater drainage patterns evolution in the study site during the Quaternary, and of the magnitude and timing of past local climate variations. By comparing our findings with results from other regional and southern hemisphere palaeoclimate studies, this research aims at providing insights into natural energy re-distribution mechanisms responsible for climate variability in northern Patagonia and the southern mid-latitudes. Such palaeoclimatic information is vital to parameterize climate models and better assess the significance of current and predicted global environmental change.