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Simon Gascoin

@sgascoin.bsky.social

https://labo.obs-mip.fr/multitemp/author/simon-gascoin/

58 Posts1176 Follower586 Folgt
Patrick Marques@pmarques35.bsky.social · 12mo ago

[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

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

insu.cnrs.fr

Simon Gascoin@sgascoin.bsky.social · last yr.

Five years in the making.. New study about the snow cover trends in the Alps and Pyrenees tc.copernicus.org/articles/19/...

Trends in the annual snow melt-out day over the French Alps and Pyrenees from 38 years of high-resolution satellite data (1986–2023)

Abstract. Information on the spatial–temporal variability of seasonal snow cover duration over long time periods is critical for studying the responses of mountain ecosystems to climate change. Howeve...

tc.copernicus.org

Richard Eckman@richeckmanatm.bsky.social · last yr.

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 · last yr.

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
Simon Gascoin@sgascoin.bsky.social · last yr.

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/...

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...

agupubs.onlinelibrary.wiley.com

Simon Gascoin@sgascoin.bsky.social · last yr.

We have generated a Landsat-based dataset to characterize the snow melt-out date in the Pyrenees, Alps, and Greater Caucasus. Data and code available! www.nature.com/articles/s41... by Bayle et al.

Snow melt-out date (SMOD) change spanning four decades in European temperate mountains at 30 m from Landsat time series - Scientific Data

Scientific Data - Snow melt-out date (SMOD) change spanning four decades in European temperate mountains at 30 m from Landsat time series

nature.com

Max Van Wyk de Vries@maxvwdv.bsky.social · last yr.

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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Wolfgang Cramer@cramer-bondeau.fr · last yr.

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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Simon Gascoin@sgascoin.bsky.social · last yr.

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...

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...

doi.org

@etienneberthier.bsky.social · 2y ago

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.

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...

doi.org