Lightnews — Scholar-powered news

Fabrice Ardhuin @fabriceardhuin.bsky.social · 1d

Les houles lointaines ne peuvent plus échapper au nouvel instrument de mesure "KaRIN", enmbarqué depuis 2022 sur le satellite SWOT. Ces nouvelles données éclairent d'un nouveau jour la question de la formation des vagues les plus hautes.

Patrick Marques @pmarques35.bsky.social · 1d

[1/3] INSOLITE - La tempête Eddie a généré des vagues de près de 20 m, un record mesuré depuis l’espace. Grâce aux satellites SWOT et Copernicus, les chercheurs ont suivi leur propagation sur 24.000 km, révélant l’ampleur mondiale de la puissance des houles océaniques. #geography

Satellites record 20-meter high wave, showing the power of ocean swell

During recent storms, satellites recorded ocean waves averaging nearly 20 meters high—as tall as the Arc de Triomphe in Paris and the largest ever measured from space. Moreover, satellite data now rev...

phys.org

1

Patrick Marques @pmarques35.bsky.social · 1d

[1/3] INSOLITE - La tempête Eddie a généré des vagues de près de 20 m, un record mesuré depuis l’espace. Grâce aux satellites SWOT et Copernicus, les chercheurs ont suivi leur propagation sur 24.000 km, révélant l’ampleur mondiale de la puissance des houles océaniques. #geography

Satellites record 20-meter high wave, showing the power of ocean swell

During recent storms, satellites recorded ocean waves averaging nearly 20 meters high—as tall as the Arc de Triomphe in Paris and the largest ever measured from space. Moreover, satellite data now rev...

phys.org

1 7 7

Ouest-France @ouest-france.fr · 2d

Des travaux de voiries ont mené à une découverte étonnante à Plovan (Finistère). Présents pour intervenir sur un nid-de-poule, des employés communautaires ont mis au jour l’entrée d’une cavité souterraine. Selon un archéologue, il pourrait s’agir d’un accès à un souterrain remontant à l’Âge de fer.

En Finistère, le nid-de-poule cacherait un « puits d’accès à un souterrain gaulois de l’Âge du fer »

Des travaux de voiries ont mené à une découverte étonnante, ce lundi 6 octobre 2025, à Plovan (Finistère). Présents pour intervenir sur un nid-de-poule, des employés communautaires ont mis au jour l’e...

www.ouest-france.fr

14 43

Richard Waite @waiterich.bsky.social · 3d

This is an extremely common food-GHG pattern for food providers in North America and Europe, but it never fails to surprise people the first time they run the numbers and see it!

Just one food, beef, can account for 40-50% or more of the GHG emissions related to an organization’s food purchases.

Dr. Sarah Fortner @erthsarah.bsky.social · 3d

A reality check for me was working with students on an internal carbon accounting platform that Bon App our food provider uses. Beef was less than 5% of our purchases but around 50% of our food emissions even with international work to be plant forward.

apnews.com/article/plan...

A recipe for avoiding 15 million deaths a year and climate disaster is fixing food, scientists say

Scientists are presenting new evidence that the worst effects of climate change can’t be avoided without a major transformation of food systems.

apnews.com

1 17 43

Cellule investigation de Radio France @investigationrf.bsky.social · 6d

🔴 Cum Cum : enquête sur ces milliards qui échappent au fisc

Le Crédit Agricole a reconnu que ces transactions financières étaient bien une fraude fiscale

💸 Le but : échapper à l'impôt sur les dividendes.
Mais 13 banques 🇫🇷 sont sous le coup d’enquêtes fiscales.

🔎 Anne-Laure Barral

6 88 110

Patrick Rafter @oceanandclimate.bsky.social · 7d

Today, we published a study long in the making on how upper and subsurface tropical Pacific waters responded (and maybe will adjust) to warmer global climate. Here’s the story of how we got here after 15 years. many authors but shout out @jfarmersalmanac.bsky.social
🌊
www.science.org/doi/10.1126/...

Persistent eastern equatorial Pacific Ocean upwelling since the warm Pliocene

Upwelling generates a nutrient-rich “cold tongue” in the eastern equatorial Pacific Ocean (EEP), with impacts on global climate, oceanic biological productivity, and the carbon cycle. The cold tongue ...

www.science.org

2 34 74

Fabrice Ardhuin @fabriceardhuin.bsky.social · 9d

Hello 🌊 ... thanks for AVISO for picking up on our recent paper about big waves ...

www.aviso.altimetry.fr/en/news/idm/...

1 2 3

Fabrice Ardhuin @fabriceardhuin.bsky.social · 9d

🌊. Today and tomorrow we have a User Consultation Meeting for @esaclimate.bsky.social SeaSate CCI project: projects.noc.ac.uk/seastatecci/...

there is a zoom link with the program: noc-ac-uk.zoom.us/s/89391592366

We'll be discussing satellite wave observation for climate.

Programme | Sea State Climate Change Initiative (CCI)

projects.noc.ac.uk

Fabrice Ardhuin @fabriceardhuin.bsky.social · 12d

La dernière fois que j'ai regardé il y avait au moins 2 îles: Sao Tomé et Principe ... donc "archipel" ?

Les linguistes atterrées @tract-linguistes.org · 12d

🔥 Remise des prix de notre concour de nouvèles en ortografe exploratoire :
🗓️ Venez, si vous pouvez, le 11 octobre, ce sera un moment très sympathique !
🎤 Cérémonie conduite par @laeliaveron.bsky.social et Valentin Richard, avec la participation de @marcandea.piaille.fr.ap.brid.gy

Détails ⤵️

2 9 28

Aliènor Bertrand @alienorbertrand.bsky.social · 14d

Fermeture des petites maternités, destruction des PMI, etc.
Dix départements français n'ont PAS de maternité.
75 % des maternités ont disparu en France en 50 ans.
Et pas non plus d'augmentation conséquente de moyens dans les grandes maternités.

Pas de mots.

www.sciencesetavenir.fr/sante/maladi...

La mortalité des nouveau-nés augmente en France, mais uniquement chez les moins favorisés

La mortalité néonatale augmente en France, et ce sont les moins favorisés qui en portent le poids. Les 20% aux mères les plus défavorisées ont +70% de risque de décéder dans leur premier mois de vie q...

www.sciencesetavenir.fr

12 240 220

Prem Sikka @premnsikka.bsky.social · 15d

Curse of private equity.

After US hospitals were acquired by private equity firms, patient death rates in the emergency depts rose by 13% compared with similar hospitals.

PE cut staffing, wages, investment; hiked profits.

People killed for profit.

Yet UK handing healthcare to PE.

Death rates rose in hospital ERs after private equity firms took over, study finds

The increased deaths in emergency departments at private equity-owned hospitals are most likely the result of reduced staffing levels, researchers say.

www.nbcnews.com

23 370 640

Damian Carrington @dpcarrington.bsky.social · 15d

Meat vs EAT-Lancet Planetary Health Diet: The dynamics of an industry-orchestrated online backlash

Report by the Changing Markets Foundation

changingmarkets.org/report/meat-...

Meat vs EAT-Lancet: The dynamics of an industry-orchestrated online backlash • Changing Markets

The EAT-Lancet Commission publish EAT-Lancet 2.0: an update to the planetary health diet 2019. One of the most influential academic studies ever released, it also faced significant online backlash – o...

changingmarkets.org

8 25

Fabrice Ardhuin @fabriceardhuin.bsky.social · 15d

A cloud radar in space that can also get ocean echoes? WIVERN is selected for @esaearth.esa.int EE11!

OK, I did have a different proposal for EE11 called STREAM ... and I also got involved in the EE11 proposal SEASTAR... so this is really not optimized for currents

www.esa.int/Applications...

ESA selects WIVERN as 11th Earth Explorer mission

After meticulous preparation and rigorous evaluation, ESA’s Member States have selected WIVERN to become the 11th Earth Explorer mission to be implemented through the agency’s prestigious FutureEO pro...

www.esa.int

1 5

Nicolas Goldberg @goldnic.bsky.social · 16d

Le dernier parc d’éolien offshore attribué à… 66€/MWh !

À retenir quand vous entendrez que « l’éolien offshore c’est cher » ou des chiffres fantaisistes… Même en intégrant le raccordement, c’est très compétitifs pour de nouvelles installations

totalenergies.com/fr/actualite...

France : TotalEnergies choisi par l’Etat en tant qu’opérateur du plus grand projet d’énergie renouvelable du pays

Paris, le 24 septembre 2025 – Le consortium de TotalEnergies et RWE a été désigné par le Ministère chargé de l’Industrie et de l’Energie lauréat de l’appel d’offres Centre Manche 2 (AO8) pour concevoi...

totalenergies.com

8 21 60

RFI @rfi.fr · 16d

🔴 URGENT - L'homme d'affaires franco-libanais Ziad Takieddine, connu pour l'affaire libyenne en France, est décédé

Disparition du Franco-Libanais Ziad Takieddine, personnage-clé de l'affaire libyenne en France

L'homme d'affaires franco-libanais Ziad Takieddine était l'accusateur principal de Nicolas Sarkozy dans l'enquête sur les financements allégués de sa campagne présidentielle 2007 par le régime libyen…

rfi.my

1 2

Fabrice Ardhuin @fabriceardhuin.bsky.social · 16d

You can support his work and order one of his many pictures: www.stichelbaut.com/-/galleries/...

Benoit Stichelbaut Photographe | Ocean Indien

Galerie: Ocean Indien sur Benoit Stichelbaut Photographe

www.stichelbaut.com

Fabrice Ardhuin @fabriceardhuin.bsky.social · 16d

Waves and their organization from large scales to breaking events that generate foam and smaller ripples on top of all of these are fantastic to watch. This picture by Benoit Stichelbaut, taken in the Southern ocean, has a lot to teach us about how waves are organized. doi.org/10.1073/pnas...

Cover image: Pictured are high seas (10–12 meters) in the Southern Ocean. Fabrice Ardhuin et al. determined the heights and periods of ocean swells using satellite sea level measurements. The data revealed how large waves evolve in storms; energy from steep, short waves feeds long, high waves that radiate outward as swells from the storm. The highest waves observed were around 19.7 meters high with a period of around 20.2 seconds. According to the authors, uncovering the formation and distribution of large ocean swells can help design durable coastal structures. See the article by Ardhuin et al. e2513381122. Image credit: Benoit Stichelbaut (photographer). https://doi.org/10.1073/pnas.2513381122

1 2

Fabrice Ardhuin @fabriceardhuin.bsky.social · 17d

Hum
... that title is for a paper in JPO

1

Fabrice Ardhuin @fabriceardhuin.bsky.social · 19d

I picked out Igor, because I'll never forget how he arrived one day late as his administration had booked a flight to Monterrey ... not Monterey. More importantly Igor did great work on wave-current and wave-ice interactions and practical 4-wave interactions calculations which I am now using.

Fabrice Ardhuin @fabriceardhuin.bsky.social · 19d

The waveworkshop.org is the first workshop I attended as a PhD student... it was across the street from NPS Monterey. I had the honor to meet great scientists including Igor Lavrenov. The last I attended was in Liverpool... today I m heading to Santander by train.

International Workshop on Waves, Storm Surges and Coastal Hazards

waveworkshop.org

1 1

Fabrice Ardhuin @fabriceardhuin.bsky.social · 19d

🌊 I have always wondered how much oxygen transfer from atmosphere to ocean could be important given that oxygen is also produced by plankton. In this paper www.pnas.org/doi/epdf/10.... , Luc Deike et al. argues for the importance of waves in enhancing the O2 concentration in the ocean.

A universal wind–wave–bubble formulation for air–sea gas exchange and its impact on oxygen fluxes

www.pnas.org

2 5

Prof Bill McGuire @profbillmcguire.bsky.social · 20d

I'm sorry, but this is unjustified, optimistic, drivel

Governments across the world are turning away from green measures and FF corporations are expanding operations

Best we can hope for is a return to the Pliocene - 3C hotter and sea levels eventually up 20m

www.theguardian.com/environment/...

‘Something is working’: UN climate chief optimistic about green transition

Exclusive: Simon Stiell believes economic benefits will compel countries to speed up climate action

www.theguardian.com

14 36 110

Fabrice Ardhuin @fabriceardhuin.bsky.social · 22d

🌊. About big waves: my most sincere apologies to the many colleagues who have written about storm Hercules (starting with Sonia Ponce de Leon and Carlos Guedes Soares) and which I should have cited. Let me know if we missed others in our storm table: docs.google.com/spreadsheets...

1

Fabrice Ardhuin @fabriceardhuin.bsky.social · 22d

I am looking forward to discuss further SWOT accuracy for wave heights close to coasts. See you Arcachon next month.

Rémi Gandoin @remiwnd.bsky.social · Aug 14

"In Situ Geometric Validation of SWOT Satellite Observations in Bass Strait, Australia" agupubs.onlinelibrary.wiley.com/doi/10.1029/...

In Situ Geometric Validation of SWOT Satellite Observations in Bass Strait, Australia

We use an array of GNSS buoys with a differential-SSH uncertainty of 4.6 mm to validate SWOT observations in a coastal shelf sea region We find KaRIn sea surface height precision below 7.0 mm ove...

agupubs.onlinelibrary.wiley.com

Fabrice Ardhuin @fabriceardhuin.bsky.social · 23d

Matching the satellite data with model output revealed some interesting patterns: the particular model we used has a rather small bias up to Hs = 19.7 m, the new record for satellite-measured significant wave height.

Along-track 1 Hz raw estimates of significant wave height from SWOT Poseidon-3C instrument, compared to numerical models using different parameterizations of the 4-wave interactions. (December 21, 2024, north Pacific)

Fabrice Ardhuin @fabriceardhuin.bsky.social · 23d

Last year we gave a method to estimate properly the very large wave heights and uncertainties ( doi.org/10.1029/2023... ). We have now applied that to all the 1 Hz measurements that exceed 10 m in the newly released SeaState CCI V4 dataset, and built a storm catalog: drive.google.com/drive/folder...

doi.org

1 1

Fabrice Ardhuin @fabriceardhuin.bsky.social · 23d

🌊 I've been working on the SWOT satellite for some time, and on ocean waves even longer, including as the science lead for @esaearth.esa.int SeaState Climate Change Initiative. This paper is about the largest ocean waves, looking back at 34 years of data www.umr-lops.fr/en/SWOT-reve...

SWOT reveals the largest ocean waves

Building on the 34 years of wave height measurements by satellite and the capabilities of the new SWOT satellite, a study reveals a new record for the highest ocean waves ever measured in the open oce...

www.umr-lops.fr

4 4 14

Fabrice Ardhuin @fabriceardhuin.bsky.social · 23d

🌊. Si les grandes vagues vous intéressent:
www.umr-lops.fr/Le-satellite...

@nicolasblandin.bsky.social

Le satellite SWOT révèle les plus grandes vagues

Grâce à 34 ans de mesures de hauteur des vagues par satellite, et les nouvelles capacités du satellite SWOT, une étude révèle un nouveau record de hauteur et les conditions de formation de ces vagues...

www.umr-lops.fr

1 4

Fabrice Ardhuin @fabriceardhuin.bsky.social · 23d

This cool video is about debating. It is a bit off my usual topics, but, after presenting some technical and scientific stuff in front of a 30-strong panel last week, and being questioned about it, I still find it fascinating how techniques can help make an argument. www.youtube.com/watch?v=Zn0_...

Cambridge Debate Coach Reveals How She Humiliated Charlie Kirk

YouTube video by Rationality Rules

www.youtube.com

2 6