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Nils Hählen

@nilshaehlen.bsky.social
98 followers 79 following 4 posts

Passionate about mountains and natural hazards, Head of Natural Hazards Division at the Office of Forests and Natural Hazards Canton Bern, Switzerland

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Reposted by Nils Hählen
VAW Glaciology @vaw-glaciology.bsky.social · 23/09/2026
New paper from our group, led by PhD student @beerjanosch.bsky.social: "Polythermal conditions in small glaciers in the Swiss Alps" The paper presents a comprehensive borehole and radar dataset on the thermal structure of six small Swiss glaciers. doi.org/10.5194/tc-2...
doi.org
Polythermal conditions in small glaciers in the Swiss Alps
Abstract. Englacial temperature measurements in the Alps remain sparse and biased toward high-elevation accumulation areas, leaving the thermal state of ablation zones poorly constrained. Here, we pre...
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Prof Friederike Otto @frediotto.bsky.social · 17/09/2026
What are known causal factors behind rock-ice avalanche near Nepal–Tibet border? @wwattribution.bsky.social Vulnerable slope, potentially weakened by 2015 earthquake, definitely destabilised by climate change through glacier retreat & permafrost thaw. www.worldweatherattribution.org/rapid-warmin...
Height of the 0C isotherme in recent years around the rock-failure
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Melaine Le Roy @subfossilguy.bsky.social · 15/09/2026
🧊🔥 6 meters !🔥🧊 This is what the largest glacier in the Alps has lost at Konkordiaplatz at 2900 m asl during the insane 2026 summer ! 'No words' as @matthias-huss.bsky.social (pictured here) said! 😲😱 📷 A. Linsbauer
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Earth and Planetary Sciences at ETH Zurich @eth-eaps.bsky.social · 21/08/2026
The Engineering Geology group at ETH Zurich is looking for doctoral student in debris flow monitoring with focus on deriving velocity and flow depth estimates at unprecedented spatial and temporal resolutions by analysing point cloud and camera data. #phd #jobalert www.jobs.ethz.ch/job/view/12038
jobs.ethz.ch
Doctoral Position in Debris Flow Monitoring
The Engineering Geology Group, (Prof. Dr. Jordan Aaron, Geological Institute) is looking for a creative and motivated doctoral candidate with a strong interest in debris flows mechanisms, field…
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WSL Umweltforschung @wslresearch.bsky.social · 21/08/2026
🍁🚣🏼‍♀️Waldbäume färbten sich schon im Juli braun, Gewässer hatten rekordtiefe Wasserstände: Der Sommer 2026 war extrem trocken und heiss. Experten und Expertinnen von WSL und SLF antworten auf häufige Fragen. www.wsl.ch/de/metanavig... #Trockenheit #Wassermangel #forestecology #Wald #Energie #Hitze
wsl.ch
Trockenheit 2026: Häufige Fragen und Antworten
Die Eidg. Forschungsanstalt WSL untersucht Wald, Landschaft, Biodiversität, Naturgefahren sowie Schnee und Eis. Sie gehört zum ETH-Bereich.
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WSL Umweltforschung @wslresearch.bsky.social · 07/07/2026
🍁 Trees in Europe are increasingly dying prematurely. A new WSL study on French #forests now shows that it is not only extremely dry summers but #climate anomalies in general that are driving tree mortality – particularly warm and wet springs: www.wsl.ch/en/news/why-... @lsce-ipsl.bsky.social 🌍
wsl.ch
Why Europe’s trees are dying
Deviations from the usual climate are causing trees to die prematurely. Even favourable growing conditions can have a negative impact.
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VAW Glaciology @vaw-glaciology.bsky.social · 17/06/2026
New preprint from our group! Our PhD student Janosch Beer and several VAW members present a borehole thermometry and radar dataset on englacial temperatures across 6 small Swiss glaciers. The paper is open for community discussion on EGUsphere! Preprint: doi.org/10.5194/egus...
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 26/05/2026
"Die Vorstellung eines Klebers, der den Berg zusammenhält, ist für grosse Hanginstabilitäten [...] unpassend", sagt #SLF Forscher Robert Kenner über die gängige Meinung, #Permafrost sei wie ein Kleber. Details: www.slf.ch/de/news/perm... 📷️ 1: Marcello Negrini / 2: Stefan Suhner #CERC
slf.ch
Permafrost – das dünne Eis des Kenntnisstands
Was haben tauender Permafrost und schmelzende Gletscher mit Felsstürzen zu tun? Permafrost-Forscher Robert Kenner fasst zusammen.
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VAW Glaciology @vaw-glaciology.bsky.social · 08/05/2026
1/3 The #GLAMOS winter snow accumulation report for Swiss glaciers in 2026 is out! Snow depth measurements on 25 glaciers across Switzerland were carried out in April/May together with colleagues from the Universities of Zurich and Fribourg. #Glaciology #SwissGlaciers
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Marc-André Brideau @mabrideau.bsky.social · 13/04/2026
Our paper (me, @drewbrayshaw.bsky.social and Carie-Ann Hancock) providing highlights for British Columbia from the preliminary Canadian landslide database is now available at cmscontent.nrs.gov.bc.ca/geoscience/P... A bit thanks for all the 15 contributors for their ongoing support.
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Earth and Planetary Sciences at ETH Zurich @eth-eaps.bsky.social · 08/04/2026
Weathered rock layers beneath the soil influence how groundwater moves during storms. The findings of a new study, led by ETH Zurich researcher Seulgi Moon (formerly UCLA), help explain when and where shallow landslides occur and could improve hazard prediction.
eaps.ethz.ch
A new study improves prediction of shallow landslides
Weathered rock layers beneath the soil influence how groundwater moves during storms. The findings help explain when and where shallow landslides occur and could improve hazard prediction.
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MeteoSchweiz @meteoschweiz.ch · 07/04/2026
Der #Klimawandel schreitet voran. In der Schweiz ist es im Jahresmittel bereits rund 3 °C wärmer als in der vorindustriellen Zeit. Eine neue Darstellung zeigt, wann in den verschiedenen Jahreszeiten eine Erwärmung von 1, 2 und 3 °C erreicht wurde. MeteoSchweiz-Blog: bit.ly/4tRF7IT
Das Bild zeigt den Temperaturanstieg in der Schweiz seit der vorindustriellen Referenzperiode in den vier Jahreszeiten und im Jahresmittel (Quelle: MeteoSchweiz)
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Institute of Geological Sciences, Uni Bern @geologyunibern.bsky.social · 24/03/2026
📢 Paper alert! Anja Rubin et al. used surface exposure dating and runout modelling to elucidate the triggering mechanisms of the Sierre landslide, providing insights into landscape dynamics during the transition to the Holocene. Read more at ⬇️ sjg.pensoft.net/article/1803...
sjg.pensoft.net
The Sierre landslide: chronology, dynamics, and insights into Alpine post-glacial instabilities
Today, natural disasters in alpine valleys pose a continuous threat to urban areas and infrastructure. Investigating past mass movements and assessing their return periods enhances our ability to pred...
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VAW Glaciology @vaw-glaciology.bsky.social · 06/03/2026
A new Perspective paper in Nature Communications Earth & Environment compares the 2021 Chamoli disaster with the recent Blatten avalanche. Why did one kill >200 people while the other caused only one casualty? Link to paper: www.nature.com/articles/s43...
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Simon Cook 🏔❄🌊 @glaciocook.bsky.social · 04/03/2026
🏔️❄️New book chapter on GLACIAL HAZARDS now published in ‘Comprehensive Cryospheric Science and Environmental Change’. Covers paraglacial landslides, permafrost degradation, ice &snow avalanches, glacier detachments, GLOFs, ice-volcano interactions Full: lnkd.in/eGtqQf8H Pre-print: lnkd.in/ek59Swfu
A small ice avalanche, Morsarjokull, Iceland
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Mountain Research Initiative @mtnresearchmri.bsky.social · 03/03/2026
🔥📢 Call for Papers on Wildfires in a Changing #Climate: Impacts, #Adaptation, & Policy. This Special Issue seeks submissions that examine the economic & welfare consequences of #wildfires & smoke & evaluate policy responses. ⏰ Deadline 30 Sept 2026 🔗 tinyurl.com/ryn3epjd #OurChangingMountains
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Mountain Research Initiative @mtnresearchmri.bsky.social · 27/02/2026
Our February 2026 MRI Newsletter is out now!🗞️✨ Glacier news, mountain updates, new research, & community announcements from around the world. Take a look & stay connected with what’s happening in #OurChangingMountains. 🔗 tinyurl.com/MRINewslette... #MountainResearch #ResearchFunding #ResearchNews
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 09/02/2026
Avalanche winter of 1951: ⁠They are the cheapest and most important form of avalanche protection in terms of area – and they grow back naturally: forests. What the SLF researched after the avalanche winter of 1951: www.slf.ch/en/news/aval... ⁠ #SLF #SLFDavos #Snow #Avalanche #Winter #forest
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Earth and Planetary Sciences at ETH Zurich @eth-eaps.bsky.social · 06/02/2026
The ETH Swiss GeoLab, a newly established applied research facility, is recruiting an experienced administrative professional as Office Manager. Be part of the pioneering GeoLab and contribute to its operational foundations and workplace culture.
jobs.ethz.ch
Office Manager at ETH Swiss GeoLab
ETH Zurich is establishing the ETH Swiss GeoLab, a pioneering applied research facility located in Lucerne (initially based in Zurich). The GeoLab focuses on multidisciplinary collaboration and…
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 28/01/2026
#Job am #SLF in #Davos: Für die Forschungsgruppe #Schutzmassnahmen suchen wir eine/n neue/n Mitarbeiter/in. Zu den Aufgaben gehören u.a. Gutachter- und Beratertätigkeit und die Planung von Schutzmassnahmen. Alle Infos und Bewerbung: apply.refline.ch/273855/1836/...
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GEO Mountains @geomountains.bsky.social · 28/01/2026
🌄 New #MeteoSwiss research: Swiss lowlands heat up faster in autumn & winter as fog declines, while mid-elevations warm more in spring due to snow loss. ➡️ Some popular #climate datasets miss these elevation-specific signals entirely. Time-consistent, high-resolution observations matter. 🌍❄️
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Reto Knutti @retoknutti.bsky.social · 26/01/2026
Als direkte Demokratie braucht die Schweiz vielfältige & unabhängige Medien. Über 600 Professor:innen aus allen Sprachregionen & Disziplinen setzen sich deshalb ein für einen starken Service public und sagen «Nein» zur Halbierungsinitiative. ➡️ www.wissenschaft-fuer-den-service-public.ch
wissenschaft-fuer-den-service-public.ch
Professorinnen und Professoren gegen die Halbierungsinitiative – Warum wir Professorinnen und Professoren uns für einen starken Service public einsetzen und die SRG-Halbierungsinitiative ablehnen
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EGU Natural Hazards Division @nh.egu.eu · 22/01/2026
Throwback Thursday ⏪ In case you missed past posts from our blog 👀 Today we are heading to Switzerland 🇨🇭, where Christophe Lambiel answers our questions about the Blatten landslide that occurred in May 2025. Check the article to learn more about the event: blogs.egu.eu/divisions/nh... #EGUblogs
blogs.egu.eu
The Blatten landslide in Switzerland
In the morning of May 28, 2025, the picturesque Swiss alpine village of Blatten sat quiet and serene in the Lötschen Valley. Exceptionally quiet, in fact, as the village was evacuated on May…
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Mountain Research and Development @mrdjournal.bsky.social · 13/01/2026
A new article by Jean Miczka and colleagues analyzes how mountain huts in the western European Alps are being adapted to climate change, what the challenges are, and how adaptation could be improved. Recommendations include ensuring long-term coordination. Find out more: doi.org/10.1659/mrd....
Saleinaz Mountain Hut in the Swiss Alps is perched high above a steep slope, facing the cliffs and glaciers of Mont Dolent. The hut is small and built of stone, with a metal roof and two wooden extensions attached. Next to it is a small terrace with two tables and a few chairs. Photo by Jean Miczka.
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 07/01/2026
How do avalanches affect pylons and other sensitive #infrastructure? Using detailed #simulations, #SLF researcher @mjkohler.bsky.social shows that the compressibility of #snow initially reduces #avalanche pressure, but that at high speeds this buffer suddenly fails. More: www.slf.ch/en/news/aval...
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Copernicus ECMWF @copernicusecmwf.bsky.social · 11/12/2025
🌡️ November 2025 was the third-warmest November on record globally, keeping 2025 on track to be the second- or third-warmest year recorded. The global three-year average temperature for 2023–2025 will likely exceed 1.5°C above pre-industrial levels for the first time.  Read more ⬇️
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luigijorio.bsky.social @luigijorio.bsky.social · 12/12/2025
The catastrophic collapse of the Birch Glacier that wiped out the Swiss mountain village of Blatten in May has triggered an unprecedented scientific effort to understand how a mountainside could break up so violently – and what might come next.
swissinfo.ch
Unstable slopes and warming peaks: scientists race to understand Blatten collapse
The collapse of the glacier that wiped out the Swiss mountain village of Blatten in May has triggered an unprecedented scientific effort.
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 04/12/2025
#Job at #SLF in #Davos: We are looking for a Scientist in Integrated Modelling of #Risk Development in Global Change. More information and application: apply.refline.ch/273855/1812/...
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 01/12/2025
#Job at #SLF in #Davos: We are looking for a #Postdoc in #climate impacts on hydrological extreme events. More information and application: apply.refline.ch/273855/1810/... @hyclimm.bsky.social @manuelaibrunner.bsky.social
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WSL Umweltforschung @wslresearch.bsky.social · 26/11/2025
#Avalanches are of key importance to #glaciers worldwide. An international research team led by Marin Kneib (WSL & ETH Zurich) shows that up to 22% of the snow on glaciers comes from avalanches. WSL-News: www.wsl.ch/en/news/aval... @marinkneib.bsky.social @vaw-glaciology.bsky.social
wsl.ch
Avalanches are of key importance to glaciers worldwide
An international research team shows that avalanches contribute significantly to the health of many glaciers.
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WSL Extremes Research Program @extremeswsl.bsky.social · 11/11/2025
Was bedeuten Extremereignisse für die Schweiz – heute & morgen? Unsere neue Web-App macht’s erlebbar! Astrid hat sie am Treffpunkt Science City (ETH) vorgestellt – und besonders schön: Auch die Kinder waren begeistert dabei! ➡️ extremesapp.wsl.ch/de
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ETH Zurich @ethz.ch · 04/11/2025
MeteoSwiss, ETH Zurich, and C2SM present the new Swiss climate scenarios. These show how the Swiss climate will change if the global average temperature rises by 3 degrees. ethz.ch/en/news-and-... @meteoschweiz.ch, @usyseth.bsky.social #klimaszenarien #meteoschweiz #ETH #C2SM #NCCS
ethz.ch
Climate change particularly pronounced in Switzerland
Switzerland will become drier and hotter, experience less snow and face heavier rainfall in the future. Those are the conclusions reached by climate researchers from its Federal Office of Meteorology ...
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VAW Glaciology @vaw-glaciology.bsky.social · 03/11/2025
🌍 When nature shows its force Rockfalls, glacier collapses & debris flows are becoming more intense in a warming world. Join our VAW-glaciology group member Mylène Jacquemart at Treffpunkt Science City for her talk “Es rumort am Berg, Klimawandel und alpine Naturgefahren” ethz.ch/de/news-und-...
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 22/10/2025
#JobAlert in #Davos: For the #SLF Alpine Remote Sensing research group we are looking for a scientific assistant. If you are interested in working with #satellite data, check the following link for more information: apply.refline.ch/273855/1787/... #CERC
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 20/10/2025
In the red zone: New #SLF model reveals altitude-dependent #snow trends across the whole of Switzerland for the first time: average snow depths have been decreasing for decades. More details: www.slf.ch/en/news/in-t... 📷 C. Marty, J. Götte / SLF #climatechange
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 06/10/2025
Tour de CCAMM: noch bis 10. Oktober ist die Anmeldung möglich! Infos und Anmeldung: www.slf.ch/de/veranstal...
slf.ch
Tour de CCAMM – Forschung im Dialog mit der Praxis
Wie wirkt sich der Klimawandel auf gravitative Naturgefahren in den Alpen aus? Seit 2018 haben Forschende im WSL-Programm CCAMM diese Frage aus verschiedenen Blickwinkeln untersucht. Zum Abschluss des...
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Prof Friederike Otto @frediotto.bsky.social · 17/09/2025
The summer is over - and for about 16,600 people across 854 European cities that doesn't mean autumn comes, but death. People who would still be alive if it wasn't for our burning of fossil fuels. - New study with @lshtm.bsky.social www.imperial.ac.uk/grantham/pub...
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VAW Glaciology @vaw-glaciology.bsky.social · 16/09/2025
Incredible ice loss measured again at #Konkordiaplatz on the #Aletsch #Glacier, home to the thickest ice in the #Alps (still about 800 m!). Yesterday’s survey revealed another –4.6 m of ice gone in just one year. :( Measurements by @matthias-huss.bsky.social for GLAMOS
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Kristen Cook @kristencook.bsky.social · 20/08/2025
Calling for EGU 2026 session proposals! If you have an idea for a geomorphology session, head to meetingorganizer.copernicus.org/EGU26/provis... and enter it in. Sessions on new topics and themes are extremely welcome! Help to build a great programme for EGU26!
meetingorganizer.copernicus.org
Call for session proposals
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HYCLIMM - Hydrology & Climate Impacts Group @hyclimm.bsky.social · 27/08/2025
🤩New paper from our team member @cchartierrescan.bsky.social entitled 'Snow drought propagation and its impacts on streamflow drought in the Alps' published on Environmental Research Letters! Big congrats! Check out more details here: iopscience.iop.org/article/10.1... #ClimateChange #Hydrology
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Matthias Huss @matthias-huss.bsky.social · 11/08/2025
Getting used to this image: #glaciers almost completely naked - unprotected by the white snow - in August... While July was good for glaciers after record-melt in June, the new heat wave again results in major ice loss @vaw-glaciology.bsky.social
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 08/08/2025
#Satellites reveal early signs of slope instability: #SLF scientist Andrea Manconi shows that #radar monitoring with satellites help to detect slope instabilities like at Blatten years in advance. For details check the #ESA news article: eo4society.esa.int/2025/08/08/s... @esa.int @esaearth.esa.int
eo4society.esa.int
Satellite radars reveal early signs of slope instability years before Blatten rock/ice avalanche - eo science for society
On 28 May 2025, a massive rock/ice avalanche detached from the Birch Glacier above the village of Blatten in the Lötschental valley (Valais, Switzerland).
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VAW Glaciology @vaw-glaciology.bsky.social · 11/07/2025
The Swiss Cryosphere Report 2024 is out: Despite heavy snow, Swiss glaciers lost >2% of their volume. Permafrost hit record levels as heatwaves & Saharan dust take a toll on snow & ice. 🧊📉 #Kryosphärenbericht2024 #GLAMOS @slfdavos.bsky.social #PERMOS @scnat.ch 🖇️ cryosphere.scnat.ch/de/publicati...
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Matthias Huss @matthias-huss.bsky.social · 25/06/2025
Hunting the extreme year 2022... Yes, I'm really worried about the current state of Swiss #glaciers! After a dry winter, the scorching heat of the last weeks pushes glaciers towards another black year. Hoping for some cooling but the summer has only just started @vaw-glaciology.bsky.social
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SCNAT @scnat.ch · 17/06/2025
🌡️ Der #Permafrost in den Schweizer #Alpen war 2024 so warm wie noch nie – das zeigen die neuesten Daten des Beobachtungsnetzwerks #PERMOS. Diese Veränderungen werden sich auch in den kommenden Jahren und Jahrzehnten fortsetzen ➡️ scnat.ch/de/id/WbQd9 #Klima #Klimawandel
Geophysikmessungen neben dem Bohrloch und der Meteostation auf dem Stockhorn. Der Text lautet: «Permafrost in den Schweizer Alpen – 2024 war ein weiteres Rekordjahr».
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WSL Institute for Snow and Avalanche Research SLF @slfdavos.bsky.social · 10/06/2025
FAQ "Influence of #permafrost on #rockslopefailure": The permafrost in the Alps is warming rapidly and affecting major rock slope instabilities. Experts from the #SLF provide answers to the most important questions: www.slf.ch/en/permafros... 📷️ D. Hunziker #CERC #naturalhazards
Failure zone of the Piz Scerscen rock slope failure with water flowing out of the permafrost (Photo: D. Hunziker 14.4.2024)
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VAW Glaciology @vaw-glaciology.bsky.social · 02/06/2025
[1/2] We’ve released a new version of the factsheet on #Birchgletscher -- the Swiss glacier that catastrophically collapsed on 28 May 2025 following heavy debris loading from Kleines Nesthorn -- and some first field impressions that we were able to collect yesterday 🗂 polybox.ethz.ch/index.php/s/...
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Melaine Le Roy @subfossilguy.bsky.social · 01/06/2025
Nice annotated 3D model of the Birch Glacier collapse! 🏔️🧊🌊 sketchfab.com/3d-models/bl... Source: Simeon Schmauß - created from @swisstopo Rapid Mapping oblique imagery
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ETH Zurich @ethz.ch · 30/05/2025
Wie genau kam es zum Gletscherabbruch, der zur bedauerlichen Verschüttung des Walliser Dorfes Blatten führte? Dieser Frage sind ETH-Forschende nachgegangen: ethz.ch/de/news-und-... #Blatten #Gletscher #Bergsturz #Birchgletscher
ethz.ch
Was ETH-Gletscherforschende über den Abbruch des Birchgletschers wissen
Am Mittwoch ist der Birchgletscher unter der Last von Fels- und Schuttmassen eingebrochen, die von Felsstürzen am Kleinen Nesthorn stammten. In einem Faktenblatt erläutern ETH-Forschende die Hintergrü...
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VAW Glaciology @vaw-glaciology.bsky.social · 29/05/2025
Here is a factsheet on what is currently known about Birchgletscher, the Swiss glacier that catastrophically collapsed on 28 May 2025, following heavy debris loading from Kleines Nesthorn. Our thoughts are with all those most deeply affected. polybox.ethz.ch/index.php/s/...
polybox.ethz.ch
88028-VAW-2025-05_Birchgletscher_Factsheet_20250529_layouted.pdf
polybox - Use it as a logical memory stick, store your data on the ETH campus!
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