Dr Heïdi Sevestre
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drheidisevestre.bsky.social
Dr Heïdi Sevestre
@drheidisevestre.bsky.social
3.1K followers 130 following 68 posts
🏔️ Glaciologist ❄️ Winner of the inaugural Shackleton Medal for the protection of the polar regions. #Climate #glaciers #outreach #EYL40 Views my own
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drheidisevestre.bsky.social
1/ ❄️ Antarctica is calling — and we want to bring the next generation with us.
September 29, 2025 at 6:40 AM
Reposted by Dr Heïdi Sevestre
valmasdel.bsky.social
Bonjour,

Avec 60 scientifiques de 54 institutions et 17 pays, nous avons réactualisé le suivi des indicateurs clés du changement climatique et de l'influence humaine jusqu'à fin 2024,
1/...
June 19, 2025 at 12:22 PM
Reposted by Dr Heïdi Sevestre
zacklabe.com
My collection of monthly #Arctic temperature graphics have just been updated through April 2025: zacklabe.com/arctic-tempe...

#DataViz #SciComm #OpenScience #OpenData
Graph showing monthly-mean Arctic mean near-surface air temperatures for 2025 using a red line. There is a strong seasonal cycle, with a peak during the boreal summer season. There is a long-term warming trend. The other years from 1940 to 2024 are shown with sequential coloring for blue to white. Data is from ECMWF ERA5 reanalysis. The graphic is updated through April 2025.
May 7, 2025 at 8:30 PM
Reposted by Dr Heïdi Sevestre
valmasdel.bsky.social
Quel devrait être le scénario de montée du niveau de la mer pour guider l'adaptation du littoral 🇫🇷 de manière cohérente avec la trajectoire de référence pour l'adaptation au changement climatique anticipant 3°C de réchauffement mondial soit 4°C en France d'ici 2100 ?

1/...
May 5, 2025 at 5:08 PM
Reposted by Dr Heïdi Sevestre
zacklabe.com
Now looking at a spatial view of temperature anomalies during the December to February 2025 period again highlights the relative Arctic warmth and lack of cold departures to be found anywhere outside of the central Pacific.

Data information at (NASA/GISS GISTEMPv4): data.giss.nasa.gov/gistemp/faq/
Global map showing surface air temperature anomalies for the December 2024 to February 2025 period. Most all areas are warmer than average, except for La Nina. Anomalies are calculated in reference to a 1951-1980 climate baseline using GISTEMPv4.
March 24, 2025 at 12:39 PM
drheidisevestre.bsky.social
We are thrilled to announce that the Cryosphere Pavilion side event application process for UN Ocean Conference in Nice is now open!

▶️ docs.google.com/document/d/1...

The Pavilion funded by the Fondation Albédo pour la Cryosphère is on a mission to bring the cryosphere’s message to the world.
March 24, 2025 at 6:43 AM
drheidisevestre.bsky.social
Rain in the northernmost city on Earth. This month temperatures have been almost always above normal.

The Arctic is becoming totally unrecognisable.

And in the meantime #BP and #Equinor are doubling down on fossil fuels.

Profits over people. Profits over a liveable Earth.
February 27, 2025 at 8:29 AM
Reposted by Dr Heïdi Sevestre
arielwaldman.com
Stand Up For Science protest happening on Friday, March 7.

Happening in many cities across the U.S.

Details: standupforscience2025.org
STAND UP FOR SCIENCE
March 7, 2025. Washington DC and Nationwide. Because Science is for everyone.
standupforscience2025.org
February 23, 2025 at 5:31 PM
drheidisevestre.bsky.social
1000000000% agree.
February 11, 2025 at 2:33 PM
Reposted by Dr Heïdi Sevestre
zacklabe.com
A look at how #Arctic sea ice responded to the recent southerly flow of excessive heat and moisture. This same event resulted in the sudden anomalous temperature spike around the North Pole...

Data is from the 3-km AWI SIC-LEADS algorithm using AMSR2 satellite.
February 9, 2025 at 4:21 PM
drheidisevestre.bsky.social
1/4
🎬 Greenland, 1500 km by kite-ski in the name of science: THE MOVIE! 🎥

Last summer, Matthieu Tordeur and I traversed 1500 km of the Greenland Ice Sheet, powered by the wind. Our mission? To test kiting for scientific research and document climate change in the Arctic. 🌍❄️
youtu.be/2smn1yHLMJY
Greenland, 1500 km by kite-ski in the name of science
YouTube video by Dr Heïdi Sevestre
youtu.be
February 6, 2025 at 5:58 PM
drheidisevestre.bsky.social
Merci @camilleadaoust.bsky.social !
January 23, 2025 at 7:42 AM
Reposted by Dr Heïdi Sevestre
adrianluckman.bsky.social
Two Svalbard glacier surges (Arnesenbreen and Nordsysslebreen) in one frame, as seen by Sentinel-1. Hi-res video available here: aluckman4.wixsite.com/ade-s-world-...
January 3, 2025 at 11:23 AM
Reposted by Dr Heïdi Sevestre
zacklabe.com
It was another stunning year for global climate and weather extremes.

As data is processed and released in the first two weeks of January, you are going to be hearing all about these new historical records. Apologies for my many graphs in advance! 😬

Spiral below produced by svs.gsfc.nasa.gov/5190
January 2, 2025 at 12:58 PM
drheidisevestre.bsky.social
❄️ 2025: the International Year of Glaciers’ Preservation ❄️
It was about time!

At the initiative of Tajikistan, the UN has declared 2025 the International Year of Glaciers, with 📅 March 21st as the International Glacier Day. #IYGP #IYGP2025 (1/12)
January 1, 2025 at 9:09 AM
drheidisevestre.bsky.social
🎄❄️ Wishing everyone a warm and joyful holiday season filled with moments of peace and inspiration. May the new year bring us all closer to positive action and meaningful change for our planet. 🌍✨

Happy Holidays! 🎉

📸 Ilulissat, Kalaallit Nunaat
December 25, 2024 at 5:29 PM
Reposted by Dr Heïdi Sevestre
manuellabinet.bsky.social
Il y a quelques semaines, j'ai eu la chance d'échanger avec @drheidisevestre.bsky.social sur son rapport à la montagne. J'en ai fait un portrait, à retrouver dans le nouveau numéro du Zéphyr qui vient tout juste de sortir 🗻
lezephyrmag.bsky.social lezephyrmag.bsky.social @lezephyrmag.bsky.social · Dec 22
« Je me bats tous les jours pour les #montagnes »

Au chevet des glaciers, Heïdi Sevestre est attachée aux montagnes. L’infatigable scientifique alerte autant qu’elle le peut grand public et élus sur les conséquences dévastatrices du changement climatique

www.lezephyrmag.com/revue/le-zep...
Le Zéphyr n°20 - Montagnes : sommets à défendre (version papier) – Le Zéphyr
Le Zéphyr se penche sur les sommets en lutte. Découvrez ce numéro 20 de 120 pages dédié à la protection et à l'avenir des montagnes, en version imprimée.
www.lezephyrmag.com
December 23, 2024 at 12:29 PM
drheidisevestre.bsky.social
A moment out of time earlier this year in Longyearbreen glacier in Svalbard 🎶 happy holidays everyone.
December 20, 2024 at 8:26 AM
Reposted by Dr Heïdi Sevestre
zacklabe.com
Most of the #Arctic is experiencing warming temperatures over the last four decades in December. This is even larger over areas with a loss of sea ice cover, such as the Barents-Kara Seas region.

Data from @copernicusecmwf.bsky.social ERA5. For more info: doi.org/10.1175/BAMS...
Polar stereographic map showing 2-m air temperature trends from 1979 to 2023 in December. Most all areas of the Arctic are warming, especially across the Barents Sea region.
December 16, 2024 at 8:54 PM
Reposted by Dr Heïdi Sevestre
glaciology.net
A new gigantic outburst flood from Catalina lake in East Greenland [Catalinadal, Renland, Scoresbysund].

total volume: 3.4 km3
peak discharge: ~7200 m3/s
top-10 #GLOF in terms of both numbers.
previous outburst 2013

I'm sending out a press release today about it.
🧪❄️ 🥼❄️
1/x
December 12, 2024 at 12:09 PM
drheidisevestre.bsky.social
Le film de @pierredugowson.bsky.social vient de gagner le 1er Prix au Festival International du Film sur les Glaciers et on est trop fiers!
Documentaire à regarder ici: youtu.be/T92GpsvZ250?...
December 11, 2024 at 5:14 PM
drheidisevestre.bsky.social
Monday’s report, authored by the Group of Chief Scientific Advisors to the European Commission, found the “deep uncertainties” of solar geoengineering were inconsistent with the EU’s precautionary principle and its responsibility to do no harm.

HELL YES

www.theguardian.com/environment/...
EU should ban space mirrors and other solar geoengineering, scientists say
European Commission scientific advisers say technology to offset global heating could wreak havoc on weather
www.theguardian.com
December 10, 2024 at 4:30 PM
Reposted by Dr Heïdi Sevestre
subfossilguy.bsky.social
Drawing the universal distress signal 'SOS' along the entire length of the Mer de Glace with headlamps! ❄️ 💡

That was the ambitious goal of this project involving a large team of 15 people on the glacier to focus attention to its disappearance 🔥🌡️

🎥 More here
vegardaasen.com/thesosproject
The universal distress signal 'SOS' is drawn along the entire length of the Mer de Glace with headlamps!
December 10, 2024 at 3:52 PM
drheidisevestre.bsky.social
RDV Mercredi à Annecy avec les amis Fiona Mille et Jean Baptiste Bosson pour parler de nos montagnes !

Inscriptions ici:
www.helloasso.com/associations...
December 10, 2024 at 11:26 AM
drheidisevestre.bsky.social
Do you want to contribute to the launch of the International Year of Glaciers' Preservation by organizing an online side-event? Deadline December 8th

📢Launch of IYGP 2025 - Call for Online Side Events on 21st January 2025📢

www.un-glaciers.org/en/articles/...
Launch of the International Year of Glaciers' Preservation
To kick off the International Year of Glaciers’ Preservation 2025, a high-level launch event will take place on 21 January 2025 in Geneva, Switzerland and online. This launch event aims to raise awareness, stimulate action and attract funding for the further implementation.
www.un-glaciers.org
December 2, 2024 at 2:31 PM