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Simon Gascoin @sgascoin.bsky.social · 01/10/2026

After many attempts, CNES's Pléiades satellites finally captured a clear-sky view of the source area of the devastating flood in Nepal. The images show the steep landslide scar near the glacier and the huge deposits in the proglacial valley... More here: www.cesbio.cnrs.fr/multitemp/cl...

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Patrick Marques @pmarques35.bsky.social · 31/08/2025

[1/5] @sgascoin.bsky.social chercheur CNRS au CESBIO-OMP montre que le jour de déneigement a avancé d’environ 5 jours par décennie depuis 1986 dans les Alpes et les Pyrénées, jusqu’à 10 jours à certaines altitudes. Ce décalage menace l’équilibre des socio-écosystèmes montagnards. #geography

insu.cnrs.fr

Évolution du jour de déneigement dans les Alpes françaises et les Pyrénées

Des scientifiques du CNRS Terre & Univers et du CNRS Ecologie & Environnement ont étudié les bouleversements

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GAPHAZ - Glacier and Permafrost Hazards in Mountains @gaphaz.bsky.social · 25/08/2025

Very nice overview of the recent #GLOF in Pakistan by @sgascoin.bsky.social! There is so much going on these days, it’s great that various people in the community manage to find time to document these events! Fingers crossed that nobody was harmed. www.cesbio.cnrs.fr/multitemp/ra...

cesbio.cnrs.fr

Rapid analysis of the GLOF in Gupis, Gilgit-Baltistan – Séries Temporelles

The

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Simon Gascoin @sgascoin.bsky.social · 24/08/2025

My rapid analysis of the recent GLOF (?) in Gupis, Gilgit-Baltistan www.cesbio.cnrs.fr/multitemp/ra...

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Richard Eckman @richeckmanatm.bsky.social · 01/06/2025

I suspect someone may have already done this... I took the current NASA Earth fleet chart of operating and planned Earth observing missions and crossed out those recommended for cancellation in the President's budget request. It's disturbing.

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Simeon Schmauß @stim3on.bsky.social · 01/06/2025

I also derived a new elevation model from the aerial images, allowing me to visualize the elevation change in the affected areas. The rocks and debris in the valley are locally up to 32m thick and I estimate the total displaced volume is about 11 million cubic meters. #Blatten

Map of the Lötschtal showing the area affected by the glacier collapse.
Blue colors show lost elevation, red areas elevation gains.
The two most notable areas are the collapsed peak of Kleines Nesthorn and the collapsed glacier which are shown in deep blue with elevation loss of up to 128m and 51m respectively.
The material slid down the mountain in an approximately 400m wide path and accumulated in a 2,5km long area on the valley floor which is up to 32m thick.
The newly formed lake above the village of Blatten is also drawn in.

The Map text reads:
Kleines Nesthorn and Birchgletscher collapse / Blatten im Lötschental (VS)
On Wednesday, May 28th, a2025, the Birchgletscher glacier collapsed under the weight of rock and debris following the partial collapse of the Kleines Nesthorn.
Approximately 10 million cubic meters of debris flowed into the valley, burying large parts of the villages of Blatten and Ried. The debris also blocked the Lonza River, forming a small lake that destroyed several more houses in Blatten.
Analyis
Using Oblique imagery collected and provided by swisstopo on May 30th, 2025, a photogrammetric DEM was created and compared to the swissALTI3D DEM.

The following volume change was measured in the affected area:
Above Volume (m³): 11.2 Mio
Below Volume (m³): 10.1 Mio

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Simon Gascoin @sgascoin.bsky.social · 21/05/2025

Which parts of the world have the snowiest forests? Check our new paper in Geophysical Research Letters and the accompanying online visualisation by Deschamps-Berger et al. agupubs.onlinelibrary.wiley.com/doi/10.1029/...

agupubs.onlinelibrary.wiley.com

Where Snow and Forest Meet: A Global Atlas

A global atlas of the importance of snowfall in forest was calculated at 0.1° resolution from existing reanalysis and tree cover data Snow falls in forest over 23% of the land mass, mostly in the...

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Simon Gascoin @sgascoin.bsky.social · 30/04/2025

Our carbon-intensive lifestyle has a strong impact on the Alps' water cycle and ecosystems. This review by Dumont et al. is a good starter for students and anyone interested in climate change impacts in the Alps. comptes-rendus.academie-sciences.fr/geoscience/a...

comptes-rendus.academie-sciences.fr

The European Alps in a changing climate: physical trends and impacts

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Ketan Joshi @ketanjoshi.co · 25/04/2025

Incredible satellite image of the 33 (!!!!) operational fossil fuel combustion engines at the site of Elon Musk's XAI data centre “appalling that xAI would operate more than 30 methane gas turbines without any permits or any public oversight" @selc.bsky.social www.theguardian.com/technology/2...

a greyscale satelitte image of Musk's data centre - with a bright red marker showing emissions from the many (I think about 30) fossil fuel combustion engines on site

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Max Van Wyk de Vries @maxvwdv.bsky.social · 03/04/2025

Bad news for Heard Island as the US imposes a 10% tariff on its main export - windborne glaciovolcanic tephra. This is viewed as a boost for local Alaskan and Cascadia sources. Particularly serious implications for very fine grain sizes as the crypto(tephra) market is volatile at the best of times.

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Simon Gascoin @sgascoin.bsky.social · 08/04/2025

New Sinter seminar online! Dr. Franz J. Meyer (University of Alaska Fairbanks): "NISAR Data at the Alaska Satellite Facility" Dr. Shadi Oveisgharan (NASA JPL): "Retrieving Snow Water Equivalent Using InSAR in the Next Decade; Counting Down for NISAR" youtu.be/-HA2eCHajzg?...

youtu.be

SINTER Seminar 03 April 2025 - Shadi Oveisgharan, Franz Meyer

YouTube video by Snow International - SINTER

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Simon Gascoin @sgascoin.bsky.social · 02/04/2025

Sentinel-2 reveals the surface deformation after the 2025 #Myanmar #earthquake www.cesbio.cnrs.fr/multitemp/se...

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Simon Gascoin @sgascoin.bsky.social · 01/04/2025

Before/after satellite images show the displacement along the fault of the 2025 #Myanmar #earthquake #Sentinel2

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Simon Gascoin @sgascoin.bsky.social · 31/03/2025

RIP Coriolis force, Clausius–Clapeyron relation, bye bye fluid mechanics and thermodynamics.. rdcu.be/efNNg

rdcu.be

End-to-end data-driven weather prediction

Nature - End-to-end data-driven weather prediction

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Wolfgang Cramer @cramer-bondeau.fr · 22/03/2025

J'ai modifié mon kit de démarrage destiné aux scientifiques francophones spécialistes du climat, de la biodiversité et de l'environnement en déplaçant les communicateurs et les institutions vers un autre kit. Si vous pensez que je devrais vous inclure, faites-le moi savoir ! go.bsky.app/LjZgnPy

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Prof Julia Steinberger 🌹🌱🌍 #ClimateAction #Fightfascism @jksteinberger.bsky.social · 19/03/2025

Conference season is near. Dear fellow academics, first of all you shouldn't be flying anywhere for a conference, the climate crisis is real ffs. Second, DO NOT GO TO THE US unless you are cool with being detained, harmed and potentially deported to Salvadoran prison camps. So: DO NOT GO TO THE US.

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Simon Gascoin @sgascoin.bsky.social · 12/03/2025

@hagolleo.bsky.social "a petition signed by 1,683 Sentinel-2 users, urging ESA to extend Sentinel-2A’s operation"

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Simon Gascoin @sgascoin.bsky.social · 09/03/2025

In this study we show that a single satellite snow depth image significantly improves a snowpack model in a high alpine site (Zugspitze, Germany). This result is based on the evaluation of the simulated gravity signal against superconducting gravimeter measurements. doi.org/10.1029/2024...

doi.org

Superconducting Gravimeter Observations Show That a Satellite‐Derived Snow Depth Image Improves the Simulation of the Snow Water Equivalent Evolution in a High Alpine Site

Evaluation of a distributed physically based snow model using superconducting gravimetry in a high alpine area Precipitation scaling based on a single satellite snow depth image significantly imp...

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Alexander Lees @alexanderlees.bsky.social · 02/03/2025

So that's the beginning of the end for US Old Growth Forests then, prepare for massive biodiversity and carbon loss, here billed as the opposite www.whitehouse.gov/presidential... 🌎

whitehouse.gov

Immediate Expansion of American Timber Production

By the authority vested in me as President by the Constitution and the laws of the United States of America, it is hereby ordered: Section 1. Purpose.

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Ashim Sattar @glacier-hazards.bsky.social · 30/01/2025

Glad to share our paper published in the journal “Science” titled “The Sikkim flood of October 2023: Drivers, causes and impacts of a multihazard cascade.” www.science.org/doi/10.1126/...

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Dave Petley @davepetley.bsky.social · 30/01/2025

Our new paper in Science (Sattar et al 2025) analyses the causes, process and impacts of the 3-4 October 2023 landslide-triggered GLOF along the Teesta River in Northern India. This was an amazing event - I've provided a summary of the research on the Landslide Blog:- eos.org/thelandslide...

eos.org

The 3-4 October 2023 Sikkim GLOF

Our new paper in the journal Science analyses the terrible landslide-triggered (GLOF) that struck India late in 2023.

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Dr Dan Shugar 🇨🇦 @watershedlab.bsky.social · 30/01/2025

New paper today in @science.org focused on unraveling the chain of events that led to the 2023 Teesta disaster, which resulted in about 130 people either dead or missing in Sikkim, India. Short thread to follow. 🧪⚒️ doi.org/10.1126/scie...

Photograph showing automobiles and buildings buried under the sediments deposited by the flood cascade at Rangpo. Photo credits: Praful Rao

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etienneberthier.bsky.social @etienneberthier.bsky.social · 31/01/2025

3 octobre 2023: une crue dévaste la vallée de la Teesta (Sikkim) entraînant la disparition de 130 personnes. Une équipe internationale, conduite par Ashim Sattar @glacier-hazards.bsky.social, décrypte dans Science (doi.org/10.1126/scie...) la cascade de phénomènes qui a conduit à cette catastrophe.

doi.org

The Sikkim flood of October 2023: Drivers, causes and impacts of a multihazard cascade

On 3 October 2023, a multihazard cascade in the Sikkim Himalaya, India, was triggered by 14.7 million m3 of frozen lateral moraine collapsing into South Lhonak Lake, generating an ~20 m tsunami-like i...

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Simon Gascoin @sgascoin.bsky.social · 29/01/2025

Blooming Lake Prespa and snow covered Baba mountain (North Macedonia) #Sentinel2 27 Jan 2025

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Antonio Vecoli (@tonyveco on X) @tonyveco.bsky.social · 28/01/2025

💙🔵🧊❄️An oustanding frozen heart shared between Ontario and Michigan: as of Jan 27 LakeSaintClair has iced over almost completely, resulting as a perfect piece of EarthArt⬇️ Latest #Landsat 9 image of Jan.27 after Storm Enzo

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Mauri Pelto @mauri-pelto.bsky.social · 25/01/2025

Kathmandu Post discusses warm dry winter, which has led to high glacier snow lines around Mt Everest mid-January 2025 averaging 5800-5900 m, replay of high snow lines winter 2024. @prajjwal.bsky.social @sgascoin.bsky.social @drmiriamjackson.bsky.social #glaciology kathmandupost.com/weather/2025...

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Simon Gascoin @sgascoin.bsky.social · 22/01/2025

Apport des observations spatiales pour le suivi du manteau neigeux et ses impacts (séminaire en ligne) www.college-de-france.fr/fr/agenda/se...

college-de-france.fr

Apport des observations spatiales pour le suivi du manteau neigeux et ses impacts | Collège de France

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Simon Gascoin @sgascoin.bsky.social · 03/01/2025

Insightful paper by Emilie Fox et al. "managing glaciers as a resource may limit, or even undermine glacier protection efforts" doi.org/10.3389/frwa...

doi.org

Frontiers | ‘Water resource’ framing for the value and governance of glacier water availability in the semi-arid Chilean Andes

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KinarNicholas.bsky.social @kinarnicholas.bsky.social · 20/12/2024

Hydrology Paper of the Day @sgascoin.bsky.social suggested by @hydrologywsl.bsky.social on Sentinel-2, Pléiades DEM datasets, and LIDAR IceSAT-2 products to characterize reservoirs in the Telangana State (South India): data fusion, water storage and hypsometric relationships.

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Simon Gascoin @sgascoin.bsky.social · 10/12/2024

Pour caractériser les conditions hydrométéorologiques lors de la crue torrentielle qui a frappé la Bérarde en juin, j’ai analysé une nouvelle série de cartes d’enneigement qui couvre la période 1984-2024 (104 km²) .. www.cesbio.cnrs.fr/multitemp/ev...

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Mauri Pelto @mauri-pelto.bsky.social · 10/12/2024

For Steffen Glacier, Chile I noted on 10-7-24 a rift had formed that would lead to large calving event. This happened by12-5, iceberg Z1 (1.1km2) and Z2 (0.6 km2 +melange. Retreat of calving front ~2.5 km. @sgascoin.bsky.social @iceybethan.bsky.social #glaciology glacierchange.blog/2024/04/21/s...

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Simon Gascoin @sgascoin.bsky.social · 06/12/2024

Recent Pléiades satellite image of the Khumbu icefall shaded by Nuptse peak, Nepal Himalaya

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Simon Gascoin @sgascoin.bsky.social · 04/12/2024

J'ai fini de générer mon MNT LidarHD des Pyrénées à 1m de résolution.. 10 milliards de pixels valides quand même 🤩

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Mauri Pelto @mauri-pelto.bsky.social · 29/11/2024

Study provides thorough examination of current precarious state of Pyrenean glaciers, "..area change between 2020 and 2023 is -94.8 ha, representing a -39.8% decrease of the glaciarised area from 2020 to 2023" That is nearly 10% area loss per year with 2.5 m of average thinning during same period.

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Simon Gascoin @sgascoin.bsky.social · 29/11/2024

Pyrenean glaciers are disappearing fast: state of the glaciers after the extreme mass losses in 2022 and 2023 - by Eñaut Izagirre and colleagues doi.org/10.1007/s101...

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Simon Gascoin @sgascoin.bsky.social · 22/11/2024

Je viens de télécharger et traiter 1.2 To de nuages de points LidarHD pour générer un MNT du département du Var. L'opération n'a pris qu'une demie journée grâce à cet outil github.com/cusicand/lid... de Diego Cusicanqui. Vivement la mise à disposition du MNT LidarHD officiel à l'échelle nationale..

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Simon Gascoin @sgascoin.bsky.social · 22/11/2024

Great picture of the Etretat ice cliff in western France (source Météo-France - Rémi Santerne - remistn Instagram)

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Simon Gascoin @sgascoin.bsky.social · 17/11/2024

Check out our preprint in discussion "Trends in the annual snow melt-out day over the French Alps and the Pyrenees from 38 years of high resolution satellite data (1986–2023)" doi.org/10.5194/egus...

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Dr. Rebecca Barnes (she/her) @waterbarnes.bsky.social · 16/11/2024

Respectfully (I think the world of you as you know) science is a social construct - it is done by people. We may use objective methods, but our questions are human and therefore full of all the good AND bad encompassed within us.

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Simon Gascoin @sgascoin.bsky.social · 12/11/2024

Folks! I intend to write a collaborative opinion paper with about 30 coauthors.. what tools should I use? I'm trying authorea and it looks nice. Any other tip? How to organize the writing? #academicchatter #AcademicWriting

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Robbi Bishop-Taylor 🛰️🌏 @satellitesci.bsky.social · 22/02/2024

Landsat and Sentinel-2 are some of the most reliable and consistent EO satellite platforms out there. Yet the data still hides some fascinating quirks! 🛰️ The graph below shows changes in local satellite overpass times since 1986 across Australia:

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Simon Gascoin @sgascoin.bsky.social · 09/11/2024

Heavy rains and hail wiped the white lime on the greenhouses near Almeria

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