@jaccsa

Climate Scientist and Associate Professor @fgse_UNIL, adjunct researcher @CentreOeschger | @IPCC_ch WG1 Lead Author | academic co-director @ClimactSuisse

 Lausanne, Switzerland
Joined February 2014
  • Tweets2.4K
  • Following1.5K
  • Followers1K
36Media
Samuel Jaccard retweeted
Matthias Huss@matthias_hussOct 1
Devastating glacier loss in Switzerland in the extreme year 2026 - 5.5% of the remaining ice is gone! I'm still struggling to grasp the extent of this decline. This loss almost catches up with the record-shattering year 2022: too little snow in winter and intense heat @glamos_ch
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Samuel Jaccard retweeted
Nature Geoscience@NatureGeosciJul 10
Article: Hydroclimate controls on Congo peatland net oxygen release over the past 10,600 years nature.com/articles/s41561-0…

Hydroclimate controls Congo peatland net oxygen release over the past 10,600 years

Nature Geoscience - The oxygen surplus from carbon burial in Congo peatlands reached 83 petagrams of net atmospheric oxygen equivalents during the Holocene, suggesting global peatlands may have...

nature.com
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La canicule de juin va marquer un cap historique. Elle se distingue par sa précocité, par sa durée et son extension à l’échelle européenne. On fait le point avec Erwan Koch, Directeur du Centre d'expertise sur les extrêmes climatiques (ECCE) : unil.ch/news/fr/178248198842…

« Nous allons évoluer vers des canicules plus longues, plus fréquentes et plus précoces »

La canicule qui frappe la Suisse et l’Europe se distingue par une combinaison exceptionnelle de précocité, de durée et d'intensité. Erwan Koch, Directeur du Centre d'expertise sur les extrêmes...

unil.ch
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Samuel Jaccard retweeted
VAW Glaciology@VAW_glaciologyMay 18
Looking for a thesis in glaciology? VAW Glaciology at ETH Zurich has 4 Master's theses open, covering topics from ice temperatures and mountain hazards to gravimetry and ice avalanche dynamics. Full descriptions: vaw.ethz.ch/en/education/stu…
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Samuel Jaccard retweeted
EPFL@EPFLMar 20
Cinq spécialistes publient un ouvrage visant à « expliquer le changement climatique de manière accessible et rigoureuse ». Interview avec Augustin Fragnière, coauteur de ce livre et enseignant à l’EPFL et à l’Unil. actu.epfl.ch/news/la-justice…

«La justice doit être la motivation morale dans l'action climatique»

Cinq spécialistes publient un ouvrage visant à « expliquer le changement climatique de manière accessible et rigoureuse ». Interview avec Augustin Fragnière, coauteur de ce livre et enseignant à...

actu.epfl.ch
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Samuel Jaccard retweeted
EPFL@EPFL_enMar 20
A new book by five experts sets out to explain climate change “in a fact-based way that’s easy for everyone to understand.” We spoke with Augustin Fragnière, a coauthor of the book and lecturer at EPFL and the University of Lausanne (UNIL). actu.epfl.ch/news/justice-sh…

"Justice should be the moral driver behind climate action"

A new book by five experts sets out to explain climate change “in a fact-based way that’s easy for everyone to understand.” We spoke with Augustin Fragnière, a coauthor of the book and lecturer at...

actu.epfl.ch
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The Swiss Federal Council has approved funding for the “Genesis” project on the origins of life, led by ETH Zurich in collaboration with the University of Lausanne. Johanna Marin Carbonne (prof. at our facutly) is co-leading the project!congrats!👏 unil.ch/news/en/176976243960…

The Genesis project on the origin of life becomes a National Centre of Competence in Research

The Federal Council has approved funding for the “Genesis” project on the origins of life, led by ETH Zurich in collaboration with the University of Lausanne. Genesis is one of six new National...

unil.ch
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Samuel Jaccard retweeted
Nature Geoscience@NatureGeosciJan 29
Article: Anti-phased changes in Antarctic Circumpolar Current strength between the Indian and Pacific sectors of the Southern Ocean occurred on orbital timescales over the past one million years nature.com/articles/s41561-0…
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Did you miss Bob Hazen’s lecture “Data-Driven Discoveries in Mineralogy” at UNIL last week? No worries, you can now watch the full talk online. Find the replay below! youtube.com/watch?v=Lzv-NwF1…

Data-Driven Discoveries in Mineralogy – a lecture by Robert M. Hazen

A leading figure in Earth sciences, Robert M. Hazen gave an excepti...

youtube.com
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Helikite up, science on! On board FOREL in South Greenland, the GreenFjord team deployed the helikite and carried out lake sampling, incubations, drones, and a science meeting — all framed by stunning views. 📸 Julia Schmale & team @epflcampus #FOREL2025 #GreenFjord #EPFL
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1/3 🚨 Published today in @Nature We’re thrilled to celebrate the latest work by our colleague Dominik Gräff! 🎉 Using seafloor fiber-optic sensing, his team watched Greenland’s glaciers calve in real time & found something surprising 🌊🧊 📸: D. Gräff
Frontal view of a boat from land with a glacier and a fjord environment in the background.

ALT Frontal view of a boat from land with a glacier and a fjord environment in the background.

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Samuel Jaccard retweeted
Eric Guevara-Frey@eric_gf1 Aug 2025
Depuis bien longtemps, la Berne fédérale se trompe sur la manière dont la Suisse est perçue aux Etats-Unis. Elle surestime sa position et ses leviers. Contrairement à d’autres pays, elle néglige l’importance du lobbyisme à Washington. Et ça a commencé bien avant Trump. 👇
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"No deep-sea mining approved as ISA Council ends, despite continued push to start a failing industry." See below the DSCC's press release for the closing of the International Seabed Authority's Council Meeting. deep-sea-conservation.org/me… #DefendTheDeep #StopTheMachines

Media release: No deep-sea mining approved as ISA Council ends, despite continued push to start a...

The International Seabed Authority (ISA) Council Meeting concluded this morning (21.7.25) without a decision to adopt a mining code and has previously reinforced that mining should not start without...

deep-sea-conservation.org
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Heat is a silent killer. The hottest June on record in Western Europe caused 2,300 deaths across 12 cities, of which 1,500 were down to the climate crisis (see link in comment). Subsidizing fossil fuels costs lives. climate.copernicus.eu/heatwa…

Heatwaves contribute to the warmest June on record in western Europe

The European continent experienced two significant heatwaves in mid-June and late June-early July 2025. The first event peaked between 17 and 22 June, affecting large parts of western and southern...

climate.copernicus.eu
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Samuel Jaccard retweeted
Matthias Huss@matthias_huss4 Jul 2025
The #Glacier Loss Day is reached in Switzerland! From now on all melt that occurs on glaciers until October is unsustainable. This tipping point has only been reached so early in the record-shattering year 2022. Expect big ice loss due to the prolonged melt season and feedbacks
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Samuel Jaccard retweeted
simolab@simolab_19 Mar 2025
Check out our new publication, led by Christel Hassler at @EPFL. In the Fe-limited Southern Ocean, most of the organic ligands that maintain Fe available for life are produced on site by phytoplankton and bacteria. @jaccsa @NisotopesCT @ICMCSIC nature.com/articles/s41467-0…

Marine biogenic humic substances control iron biogeochemistry across the Southern Ocean

Nature Communications - Most of the iron-binding ligands are from freshly biologically produced organic matter which likely controls iron biogeochemistry across the Southern Ocean. Our findings...

nature.com
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📢conférence-vernissage mercredi 22 janvier à 17h30! Plongez à la rencontre de certains des plus anciens animaux connus dans le cadre d'une magnifique expo qui se tient jusqu'au 27 avril au Palais de Rumine. Organisé par l'@unil et le Naturéum. Infos👇 unil.ch/events/1737359971593
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🚨We are filling a 5-year postdoc/junior lecturer position in Soil Biogeochemistry at @UNIL @UNIL_FGSE. Fully-funded, independent research on microbe-mineral-organic matter interactions, #climate, #soils. Deadline: Jan 30. Start: Sept 2025. #postdocjobs #phdchat #phdone Info👇
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This paper shows that X (formerly Twitter) is a toxic platform managed to polarize views and promote toxic interactions. Time to leave X! My next post will be to say goodbye and provide my new social media address in a non toxic, decentralized platform nature.com/articles/s41467-0…
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