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Dr. Tancrède Leger

@legertancrede.bsky.social
263 followers 172 following 45 posts

Postdoc RA at University of Lausanne, interested in glacier and ice-sheet dynamics, climatology, Quaternary glaciology, glacier/ice-sheet modelling 🏔🧊💻🧪🇫🇷 sites.google.com/view/tancrede-leger

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Dr. Tancrède Leger @legertancrede.bsky.social · 18/08/2026
Excited to announce the publication of AlpIce-1 by Sarah Kamleitner et al. ! doi.org/10.1111/bor.... A database compiling geochronological (TCN and 14C) constraints on post-LGM glacier events throughout the Alps. Over 4200 published ages compiled, quality-checked, re-calculated, and categorized !
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Faculté des géosciences et de l'environnement de l'UNIL @fgse-unil.bsky.social · 02/07/2026
Une première: des scientifiques de l'Université de Lausanne ont simulé le transport des roches à travers toutes les Alpes il y a 24’000 ans. Le but: visualiser la façon dont les glaciers ont forgé les paysages actuels!👇 www.youtube.com/watch?v=HE_i... @unil.bsky.social @legertancrede.bsky.social
youtube.com
Une simulation révèle le transport des roches à travers les Alpes il y a 24’000 ans
YouTube video by Université de Lausanne
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Zack Labe @zacklabe.com · 31/05/2026
Finally updated the data source behind my global mean sea level graph so it refreshes more frequently.... yes, it is accelerating. Graphic updated regularly at zacklabe.com/climate-chan...
Line graph time series showing global mean sea level anomalies. There has been an increase of 116 mm since 1993. The data is from satellite altimeters.
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Dr. Tancrède Leger @legertancrede.bsky.social · 08/05/2026
New study by Werner et al. quantifying impact of model resolution for large-scale ice cover modelling (e.g. Icefields) with IGM. doi.org/10.5194/tc-2... We find coarse resolution creates much bias and impact of increasing res. on ice volume and speed is non-linear: more of a step-wise function
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Dr. Tancrède Leger @legertancrede.bsky.social · 22/04/2026
New paper alert ! 🏔️🧪 «Topographic controls on asynchronous glacial maxima in the European Alps during the Late Pleistocene» doi.org/10.1130/G539... In this study lead by Dr. Elena Serra: we show that a major asynchrony in the local LGM of 2 major Alps glaciers does not have to be climate-related.
doi.org
Topographic controls on asynchronous glacial maxima in the European Alps during the Late Pleistocene | Geology | GeoScienceWorld
Glacial records worldwide increasingly indicate that mountain glaciers and parts of continental ice sheets reached their maximum extents asynchronously
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Prof. Stefan Rahmstorf @rahmstorf.bsky.social · 22/03/2026
The Central England temperature record represents the longest series of monthly temperature observations in existence. Recent temperatures there are over 1.5 degrees Celsius above the 1961-1990 average, and over 2 degrees above preindustrial values. Chart: UK Met Office.
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David Harning @davidharning.bsky.social · 02/03/2026
5 years ago...when we couldn't get into the lab due to COVID, I started compiling an Icelandic Ice Sheet geochronology database. Whelp, it's finally open for discussion on ESSD. Looking forward to see what we can collectively do with this: essd.copernicus.org/preprints/es... 🧪
essd.copernicus.org
ICEland-1: A geochronological database for reconstructing Late Quaternary glacier, relative sea level, and paleoclimate patterns in Iceland
Abstract. We present a comprehensive and quality-controlled chronological database for past glacier, relative sea level, and paleoclimate changes in Iceland during the Late Quaternary: ICEland-1. The ...
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Bethan Davies @iceybethan.bsky.social · 27/02/2026
Oooh look, a juicy new paper to settle down with and read with my morning tea. www.nature.com/articles/s41...
nature.com
Mountain glacier extents at the Last Glacial Maximum - Scientific Data
Scientific Data - Mountain glacier extents at the Last Glacial Maximum
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Chris D Clark @chrisdclark.bsky.social · 03/02/2026
Drumlins, flow-sets recording shifting ice flow patterns over Scandinavia, and constraining migration of the ice sheet's main divide. Check out our new paper (Butcher et al 2026) in Boreas. Masses of data downlands available
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Dr. Evan J. Gowan @evangowan.bsky.social · 25/01/2026
A new web interface for Berger et al's insolation calculator has been released. Check it out! django.elic.ucl.ac.be/berger/insol...
django.elic.ucl.ac.be
Berger Insolation Calculator
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Andrew Dessler @andrewdessler.com · 23/01/2026
This seems to argue against the Hansen et al. argument for high climate sensitivity, as laid out in this paper: academic.oup.com/oocc/article...
academic.oup.com
Global warming in the pipeline
Abstract. Improved knowledge of glacial-to-interglacial global temperature change yields Charney (fast-feedback) equilibrium climate sensitivity 1.2 ± 0.3°
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Frances Butcher @fegbutcher.bsky.social · 21/01/2026
New paper! I took a diversion to Earth and reconstructed the flow evolution of the Scandinavian Ice Sheet. doi.org/10.1111/bor.... A privilege to work on this epic w/ @annalchughes.bsky.social, Helen Dulfer, @jeremyely.bsky.social, @chrisdclark.bsky.social @bmboyes.bsky.social & all co-authors!
doi.org
Flow‐pattern evolution of the Scandinavian Ice Sheet indicated by the subglacial lineation record over Norway, Sweden and Finland
We present a 25-stage reconstruction of the ice-flow pattern evolution of the Scandinavian Ice Sheet based on mapping and analysis of ~240 000 subglacial lineations and lineation fields across Norway...
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International Glaciological Society @igsoc.bsky.social · 19/01/2026
2nd Circular for IGS Symposium on AI in Glaciology Now Online! More info at www.igsoc.org/2nd-circular... & icefuture.org/igs2026/ @dartmouthartsci.bsky.social @igs-egg.bsky.social @mathieu-ice.bsky.social
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Dr JF Doussin @dr-jfdoussin.bsky.social · 18/12/2025
Demantèlement du NCAR : une déclaration importante de la Direction de l'Institut National des Sciences de l'Univers du CNRS. @cnrs-insu.bsky.social @cnrs.fr
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Frank Pattyn @fpattyn.bsky.social · 05/12/2025
Antarctica’s future beyond 2100: high emissions drive major long-term ice loss. New study in Nature Communications by Vio Coulon and Ann Kristin Klose, showing that the fate of the Antarctic ice sheet, will play a decisive role in future sea level rise. www.nature.com/articles/s41...
nature.com
From short-term uncertainties to long-term certainties in the future evolution of the Antarctic Ice Sheet - Nature Communications
Even if net-zero emissions are reached well before 2100, West Antarctic ice-sheet retreat could still drive multi-meter sea-level rise by 2300. Emission reductions in the coming years are critical to ...
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Michael E. Mann @michaelemann.bsky.social · 22/11/2025
A climate deal without explicit language calling for a fossil fuel phaseout is like a ceasefire without explicit language calling for a suspension of hostilities. #COP30
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Dr. Tancrède Leger @legertancrede.bsky.social · 18/11/2025
New paper alert ! 🙂 Happy to share our new study published in The Cryosphere ! doi.org/10.5194/tc-1... We modelled the evolution of the Greenland Ice Sheet from the LGM (24 ka) to the present and learned a lot on its former history and dynamics ! @jeremyely.bsky.social @chrisdclark.bsky.social
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William Colgan @glacierbytes.bsky.social · 14/11/2025
The increasing participation of fossil-fuel lobbyists in recent COP meetings is concerning. Climate solutions should be shaped by those committed to real progress, not by those invested in slowing it down.
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Zeke Hausfather @zekehausfather.com · 04/11/2025
The new UNEP report is out with the latest estimates of 2100 warming outcomes under current policies, NDCs, and net-zero targets. Here is how it compares to both the IPCC scenarios and other estimates (CAT and IEA, who will release their own updates soon!).
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Olivier Sulpis @sulpis.bsky.social · 29/09/2025
🌟 Postdoc Opportunity in Marine Biogeochemistry at CNRS-CEREGE! 🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France! ⬇️
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Melaine Le Roy @subfossilguy.bsky.social · 19/09/2025
Arsine Glacier 18th Sept. 2025 Great overview of this wonderful site we spent so many time studying! 🥰 The landform bottom L is a moraine complex deposited after a large RA onto the glacier ~10.7 ka Check our freshly published TCN chronology of Arsine moraine sequence here! 👇 📷 @Meteofranz/IG 1/
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Nature Communications @natcomms.nature.com · 18/09/2025
Are you a #geoscientist looking to transition to an #editorial career? Our #Earth team in Nature Communications is hiring, take a look here. www.nature.com/naturecareer...
nature.com
Associate or Senior Editor, Nature Communications (Geosciences) - Shanghai, Beijing, Nanjing, New York, Washington, Jersey City, Madrid, Milan (hybrid) job with Springer Nature Ltd | 12844947
Job Title: Associate or Senior Editor, Nature Communications (Geosciences) Location(s): Shanghai, Beijing, Nanjing, New York, Washington, Jersey Ci...
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Damian Carrington @dpcarrington.bsky.social · 09/09/2025
Polar #geoengineering dismissed as “unimaginably expensive” and “dangerous” Giant underwater curtains and artificial ice thickening diverts attention from cutting fossil fuel burning, climate scientists argue - but proponents disagree #climatecrisis Story by me www.theguardian.com/environment/...
theguardian.com
Polar geoengineering dismissed as ‘unimaginably expensive’ and ‘dangerous’
Underwater curtains and artificial ice thickening divert attention from cutting fossil fuel use, says group of climate scientists
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Reporterre 🌍 | Le média de l'écologie @reporterre.net · 05/09/2025
Canicules, sécheresses et incendies. Après cet été brûlant, la climatologue Valérie Masson-Delmotte déplore que le gouvernement se cantonne à de la gestion de crise. « On n’a aucun cap au-delà de 2030 », résume-t-elle. Lire l'article ➡️ l.reporterre.net/xWS
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Zeke Hausfather @zekehausfather.com · 04/09/2025
I'm not sure many folks realize just how persistent the warming from CO2 is. Here is a set of 1000-year climate model runs (using FaIR) simulating one year of CO2 emissions (40 gigatons in 2020); a millennia later the world has not cooled back down!
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Alexandra Delbot @alexandradelbot.bsky.social · 02/09/2025
Les orages supercellulaires, très rares mais dévastateurs, pourraient augmenter en Europe avec le changement climatique. Une nouvelle étude révèle qu’une hausse de 3 °C suffit à accroître leur fréquence de 11 % en Europe avec un bond bien + marqué dans les Alpes Explications en GIF orages et chats ⬇️
radiofrance.fr
Les Alpes, un futur foyer d'orages supercellulaires
Les orages supercellulaires, très rares mais dévastateurs, pourraient augmenter en Europe avec le changement climatique. Une nouvelle étude montre qu’un climat plus chaud de 3 °C suffirait à accroître...
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Alexis Licht @alexislicht.bsky.social · 25/08/2025
Unbelievable experience with the journal Palaeo3. Our manuscript was rejected because… they couldn’t find a second reviewer, and it had been in their system “too long” (7 weeks), according to the editor. In other words, just to preserve their review-speed metrics, they rejected our submission.
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Faculty of Humanities and Social Sciences at Newcastle Uni @hassfacultyncl.bsky.social · 21/08/2025
🌎 Professor of Glaciology, @iceybethan.bsky.social has been selected as a lead author on @ipcc.bsky.social's Report 7 - regarded as the world's most authoritative source of information on climate change. ✍️Find out how Bethan will be involved in this major report >> bit.ly/4mUcoQ1
bit.ly
Newcastle expert chosen as author for next IPCC report
Professor Bethan Davies has been selected as a lead author for the forthcoming Intergovernmental Panel on Climate Change (IPCC) Assessment Report 7.
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Dr. Tancrède Leger @legertancrede.bsky.social · 06/08/2025
🔥 New paper out! 🔥 A highly detailed TCN-based glacier chronology in the Alps: providing age constraints for a series of late glacial and Holocene glacier and RA events ! Congrats @subfossilguy.bsky.social et al! Thrilled to have been part of this project! authors.elsevier.com/a/1lYtM-4PSD...
authors.elsevier.com
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Melaine Le Roy @subfossilguy.bsky.social · 06/08/2025
🔥 New paper out! 🔥 So thrilled (that's an understatement) to see this one out after so many yrs in the making! authors.elsevier.com/a/1lYtM-4PSD... Big shoutout to my coauthors, especially Irene and Philip! 🙏 We produced the most detailed TCN-based glacier chronology at a single site in the Alps!
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Mike K @mikekapglacier.bsky.social · 14/07/2025
New paper alert! Holocene glacier and climate changes in central Patagonia. Led by Carly Peltier. Also with @rlsoteres.bsky.social , and others... authors.elsevier.com/c/1lN53-4PSD...
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Christophe Cassou @cassouman40.bsky.social · 13/07/2025
Le vide argumentaire du grp macroniste #LoiDuplomb pourrait être risible s'il n’était que politicard. Mais il est terrifiant de cynisme&irresponsabilité car il compromet tout simplement santé publique, partage des communs... Il acte aussi +largement une certaine vision politique/rupture démocratique
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Melaine Le Roy @subfossilguy.bsky.social · 08/07/2025
Who could have predicted? 🙃 Marseille, France's 3rd largest city threatened by huge wildfires after the hottest June on record and a Mediterranean Sea +7°C >normal in early July! 🔥🔥🔥 People have to shut themselves away in their homes! 😱 Do you like the new normal? 🎥 © Jean-Baptiste Rivoallan
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Pete Tuckett @petetuckett.bsky.social · 04/07/2025
I’m delighted to share that our new paper is now out in @natclimate.nature.com! Our long-term, monthly Antarctic-wide dataset of surface meltwater shows that the East Antarctic Ice Sheet is becoming increasingly prone to surface meltwater ponding.
nature.com
Continent-wide mapping shows increasing sensitivity of East Antarctica to meltwater ponding - Nature Climate Change
This study provides a continent-wide assessment of surface meltwater area in Antarctica between 2006 and 2021, highlighting recent increases in magnitude and variability in East Antarctica, with indic...
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Dr. Tancrède Leger @legertancrede.bsky.social · 28/06/2025
A little preview of the 3D topo of the Swiss alps with our LGM-to-future glacier simulation movie projected onto : and which will soon depart for the Universal exhibition in Osaka (Swiss pavillon)! Currently in the Geopolis of University of Lausanne for those who want to check it out !
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Dr. Tancrède Leger @legertancrede.bsky.social · 23/06/2025
Delighted to announce that we will present modelling results from our study on the last glaciation of the Alps at the Osaka Universal Exhibition this summer! LGM-to-future evolution of glaciers projected on 3D wood-carved topo of the Alps ! Details: www.unil.ch/news/fr/1750... #OsakaWorldExpo
unil.ch
Les Alpes comme on ne les a jamais vues : cette maquette de visualisation 3D partira pour Osaka
Des scientifiques de l’UNIL ont réalisé une maquette de visualisation 3D unique, qui montre l’évolution de la couverture glaciaire en Suisse depuis la dernière grande glaciation, et jusque dans un fut...
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Valérie Masson-Delmotte @valmasdel.bsky.social · 19/06/2025
Le tableau de bord des indicateurs clés de l'état du climat et de l'influence humaine a été réactualisé, il est à votre disposition ici : climatechangetracker.org/igcc
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Lilian Schuster @lilianschuster.bsky.social · 29/05/2025
Final study of my PhD is out! www.science.org/doi/10.1126/... www.nytimes.com/2025/05/29/c... Our multi-model, multi-millennial glacier study shows: Every 0.1°C less warming preserves ~2% more mountain glacier mass; long-term impacts are much larger than 2100-only projections suggest.
Long-term committed glacier mass loss around the globe. In every circle, the blue part indicates the share of the glacier mass that will be lost irrespective of future warming (at present-day warming level of +1.2°C). Colored lines indicate the additional long-term committed mass loss to occur as global temperatures further increase. This is a simplified version of Fig. 3 of Zekollari, Schuster et al., 2025.
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Bethan Davies @iceybethan.bsky.social · 29/05/2025
Some thoughts on the #Blatten landslide, drawing heavily on the vital and excellent updates from @subfossilguy.bsky.social and @davepetley.bsky.social www.antarcticglaciers.org/2025/05/birc...
antarcticglaciers.org
Birch Glacier Landslide - AntarcticGlaciers.org
The collapse of Birch Glacier and the devastating landslide that impacted the Swiss village of Blatten occurred as a result of supraglacial landslides.
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International Cryosphere Climate Initiative @iccinet.org · 20/05/2025
Scientists show that +1.5 °C is far too warm for Earth's ice sheets and will result in several metres of sea-level rise over the coming centuries, extensive loss and damage to coastal populations and will challenge the implementation of adaptation measures www.nature.com/articles/s43...
nature.com
Warming of +1.5 °C is too high for polar ice sheets - Communications Earth & Environment
Warming of +1.5 °C above pre-industrial levels is too high for the Greenland and Antarctic ice sheets, and even the current climate forcing of +1.2 °C is likely to lead to several meters of sea-level ...
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John Bird @johnbird001.bsky.social · 20/05/2025
Model suggests impact of global warming on AMOC has led to increased flooding along US Northeast Coast phys.org/news/2025-05...
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CNRS @cnrs.fr · 13/05/2025
#Communiqué 🗞️ Le supercalculateur Jean Zay multiplie sa puissance de calcul par 4, ce qui en fait l’un des supercalculateurs les plus puissants et le plus utilisé en France et en Europe dans le domaine de l’intelligence artificielle. 💻 👉 www.cnrs.fr/fr/presse/su...
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Christophe Cassou @cassouman40.bsky.social · 10/05/2025
J’espère que ces films seront montrés à Nice a l'#UNOC en Juin. Tout acte manqué, toute négociation frileuse, toute manipulation pour faire croire que l'on protège alors que l'on tolère ce genre de pratique, est pris en conscience & connaissance, celles de la destruction du non-humain, a terme nous.
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Dr. Tancrède Leger @legertancrede.bsky.social · 28/04/2025
Nice views from the train of Cumulonimbus clouds over the alps : as I make my way to @egu.eu 2025 ! Looking forward to catching up with folks there this week :)
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Chen Zhao @czhao-ice.bsky.social · 07/04/2025
📣 Our new paper is out in Nature Communications! Subglacial water—often overlooked—can change sea-level rise projections by up to a factor of three. Big implications for how we model Antarctica. 🔗 www.nature.com/articles/s41...
nature.com
Subglacial water amplifies Antarctic contributions to sea-level rise - Nature Communications
Hidden water beneath Antarctica’s ice can accelerate ice loss, potentially raising sea levels by over 2 meters by 2300. These findings highlight the urgent need to incorporate evolving subglacial hydr...
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Ed Hawkins @edhawkins.org · 20/03/2025
Mapping changes in temperature: every decade from the 1850s to 2020s
18 maps showing decadal average temperature changes since 1850 to present, getting redder in recent decades
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Dr. Tancrède Leger @legertancrede.bsky.social · 17/02/2025
Living near Zürich and interested in the paleo glacier history of your region? I've now added to our @igm-model.bsky.social youtube playlist new videos of our model simulation published in @naturecomms.bsky.social (doi.org/10.1038/s414...) but zooming in on the Reuss glacier during the LGM:
youtube.com
Reuss glacier - Ice thickness
YouTube video by IGM Glacier Model
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Eric Steig @ericsteig.bsky.social · 29/01/2025
Important paper in Nature today about collapse of the West Antarctic Ice Sheet. There is a positive isotope anomaly at Skytrain Ice Rise during the last interglacial, consistent with what we found in our high-resolution water-isotope simulations when WAIS collapses. www.nature.com/articles/s41...
nature.com
The Ronne Ice Shelf survived the last interglacial - Nature
Sea salt data from an ice core record show that Antarctica’s Ronne Ice Shelf survived the last interglacial, the last period of enhanced and sustained global warmth about 125,000 years ago.
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Andrea Securo @andreasecuro.bsky.social · 24/01/2025
So nice to see such high resolution data from @legertancrede.bsky.social LGM modelling. Including the smaller local glaciers (red square) of the Venetian Prealps in Lessinia, Carega, Pasubio, Asiago Plateau and Monte Grappa 😍 Paper: www.nature.com/articles/s41... Videos: doi.org/10.5281/zeno...
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Dr. Tancrède Leger @legertancrede.bsky.social · 21/01/2025
We have a paper out today in @naturecomms.bsky.social on modelling the last glaciation of the European Alps, resulting in a substantial decrease in long-standing model-data misfits ! doi.org/10.1038/s414...
doi.org
A data-consistent model of the last glaciation in the Alps achieved with physics-driven AI - Nature Communications
This study employs a physics-informed AI model to reconstruct the last glaciation of the European Alps with high accuracy. The approach reduces ice thickness errors by 200–450%, yielding insights into...
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