@jescartin
CNRS Scientist @ Ecole Normale Supérieure de Paris (Dept. of Geosciences). Marine geologist. Mapping the seafloor - including with robots (autonomous and remotely-operated). Interested in tectonics, volcanism, hydrothermal activity... mostly under water.
A strong statement from the Director of CNRS Earth and Space about the dismantling of the National Center for Atmospheric Research: "a pillar of atmospheric and climate research is being torn down"
@cnrs-insu.bsky.social
@cnrs.fr
@ncar-ucar.bsky.social
👩🎓 Ouverture des candidatures PSL #PhD tracks 2026-27 en Sciences de la terre et biodiversité. Ces cursus en 5 ans s'adressent à des étudiants à haut potentiel souhaitant relever les défis scientifiques de demain et préparer, dès le niveau Master, leur projet de recherche.
👉 psl.eu/phd-track-ea...
#Communiqué 🗞️ Une hausse de la température des fluides émis par les sources hydrothermales sous-marines signale l’inflation de la chambre magmatique sous le fond marin et peut annoncer une éruption. 🌋 🌊
👉 www.cnrs.fr/fr/presse/le...
On the menu for this transit: how to set up a cruise project, the planning and management of the cruise before and during the cruise, and the follow up. From logistics to science and through administration. And supported by the French Oceanographic Fleet and the Reseau des Universités Marines.
The School de PIs #2 "ECOLπ2" now sails from St John's, arriving at Brest 21st Oct. Onboard l'Atalante F. Lallier (Sorbonne U., Station Biol. Roscoff) & M. Delescluse (ENS de Paris) together w/ 5 young scientists, C. Prigent, M. Bickert, J. Tugend, S. Sambolian & M. Ourgaud, under sunny skies now.
#DeepSeaMining would cause severe impacts in all levels of large marine ecosystems - it`s devastating
4) Sonar coverage during a dive of AUV Ulyx (gray background) covering a zone of approximately 6x3 km, with sonar swaths of about 400 m (horizontal stripes). The identified barrels shown as black dots line up along tracks followed by ships during barge dumping.
Copyright for all images: Flotte Océanographique Française - Campagne NODSSUM.
2) Barrel dumped at the seafloor at about 4700 m water depth and 3) a probable leak of unknown material - probably tar used to embed the waste in the barrels.
Copyright for all images: Flotte Océanographique Française - Campagne NODSSUM.
1) Swath of Ulyx sonar data (left) and close-up of the barrels at the seafloor, showing as bright spots (from box on the left), with the bright illuminated side by the sonar and the shadow away from the AUV.
Copyright Flotte Oceanographique Française - Nodssum cruise. Swath of Ulyx sonar data (left) and close-up of the barrels at the seafloor, showing as bright spots (from box on the left)
Copyright: Flotte Océanographique Française - Campagne NODSSUM. Barrel dumped at the seafloor at about 4700 m water depth
Copyright: Flotte Océanographique Française - Campagne NODSSUM. Barrel at the seafloor showing a probable leak of unknown material - probably tar used to embed the waste in the barrels.
Copyright: Flotte Océanographique Française - Campagne Nodssum. Sonar coverage during a dive of AUV Ulyx (gray background) covering a zone of approximately 6x3 km, with sonar swaths of about 400 m (horizontal stripes). The identified barrels shown as black dots line up along tracks followed by ships during barge dumping.
🧪⚒️ #NODSSUM cruise - On land, material & samples make their way back to home labs. And this morning we showed sonar images of barrels & photos taken by Ulyx flying at ~10 m above seafloor. Lots to do back in labs & offices. It was intense - good intense. Images: see copyright etc in thread
🧪⚒️ #NODSSUM cruise - Operational update - North East Atlantic zones NEA#3 of radioactive waste dump. UlyX mapped w/sonar 140 km2 (15 dives ), detecting more than 3000 barrels - 26 sites cored for sediment, 19 rosettes for water samples, 8 fishtraps (1 @ bottom, 9 rattails), 1 current meter.
🧪⚒️ #NODSSUM cruise - Sunday w/ pains au chocolat - & 48 h till we leave the work site. Last night no UlyX dive due to weather & coring. The 12-tube Oktopus corer preserves the water - sediment interface, and a critical part to look for radionuclides from barrels or surface fall-out.
🧪⚒️ #NODSSUM cruise - we are into the last week of the cruise. Up to now we have been spared of bad weather. We are now sandwiched in a narrow high pressure corridor w/ calm seas… ans spectacular sunsets & sunrises & moon rivers - but some rocking in the horizon this weekend.
Eric can U send an email to me and patrick? To go over this? Cheers
escartin@geologie.ens.fr
patrick.chardon@clermont.in2p3.fr
And a current meter that will stay for a year or more...
Map of operations - with the bathymetry (background with coloured relief and isobaths) and location of some of the dives - not up to date)
🧪⚒️ #NODSSUM cruise - Operational update - North East Atlantic zones NEA#3 and NEA#4 of radioactive dump. UlyX mapped w/sonar 110 km2 in 7 dives (1 to process ), detecting more than 1900 barrels, 9 sites cored 1 going (sediment), more than 10 rosettes (water samples), & 9 rattails w/fish traps
🧪⚒️ #NODSSUM cruise - on board now the teams are well seasoned and coordinated - operations run smoothly and efficiently all along- with sunshine and calm seas - finally - for the next few days…
Update of cruise results/dives/samples to come shortly
www.linkedin.com/posts/caroli...
🧪⚒️ #NODSSUM cruise - WOW behind and WOW! Science day: Ulyx came back from a sonar survey at a site visited by AUV Epaulard in 1983 - >600 barrels more (>1800 to date) + a CTD/rosette during the dive, succesful sediment coring, and two fish traps recovered w/ 5 rattails (grenadiers).
🧪⚒️ #NODSSUM cruise - WOW - Wainting on Weather with a multibeam survey and no Ulyx dive yesterday- after 5 days of work at the radioactive waste dump site. After 5 Ulyx dives we now located >1200 barrels in sonar maps, and sediment/water/fish sampling is well on the way… more details later…
🧪⚒️ #NODSSUM cruise - we arrived to the radioactive waste dump site 2 days ago & AUV UlyX is brings up sonar data that will guide our sampling strategy. After checks for radioprotection, sonar data (500 Gb) transfer via the sturdiest hard drive ever - rated 6000m depth in a tinanium bottle.
Multicorer with sediment samples
Rosette for water sampling being checked for radioprotection
AUV Ulyx coming back from a test dive - including sonar
🧪⚒️ #NODSSUM cruise - the first operations to test sampling of water and sediment, radioprotection protocoles, and the AUV w/ its new sonar are done. Soon off to a reference site w/ depths of more than 4800 m, before the work at the radioactive dump site.
🧪⚒️ #NODSSUM cruise - L’Atalante is now on the way after leaving Brest. First AUV UlyX dive tuesday morning to test all the instruments - and water and sediment sampling to set in place procedures and train the teams.
🧪⚒️ #NODSSUM cruise - the yellow UlyX - the autonomous underwater vehicle or AUV - is onboard this sunny Saturday morning - ready for deep diving & mapping the abyssal plains of the Atlantic. Back deck of l’Atalante now fully occupied also with moorings, corers, rosettes, etc. Almost ready to go.
🧪⚒️ #NODSSUM cruise - L’Atalante @ Brest harbor @ our arrival &some night pics. Empty but loading has begun & will be filled today w/ containers, instruments, the Ulyx autonomous robot, computers… Boarding Sun to set up labs & work spaces. Thanks to all making this possible #DT_INSU #FOF #GENAVIR
🧪⚒️ #NODSSUM cruise - We bring along Marina Zindy’s art works, to be placed on ballast for moorings to be deployed in coming weeks. Permanently installed at the seafloor, we may visit them in a year or two during a follow up cruise. Read about Marina's project here:
www.linkedin.com/posts/marina...
It is a vessel from the French Oceanographic Fleet - a national research infrastructure for CNRS, IRD, Universities, and IFREMER - IFREMER operates it but is not its ship.
🧪⚒️ #NODSSUM cruise - Wind and waves are limiting factors for operations at sea - & thus to gather samples and data. While far ahead, but we begin to keep track of predictions in our working area (~46N 17W 😬) - working from the 20th of June, for about 20 days (check wave height at the flagpole).
🧪⚒️ #NODSSUM cruise - J-10 and cruise preparations move along. Quizz - what is this shipment just received at Clermont Ferrand? Some clues: Not depth-rated 6000 m, ~5.5 kg in air and <0.5 kg in water. Not critical for any specific scientific operation.
🧪⚒️ - PhD position APPLICATIONS OPEN TILL JULY 15th 2025 - based @ U. Lyon (M. Andreani) w/ the participation of ENS Paris - on fluid-rock interactions at ridges. This is part of the FLUXBEATS ITN project (www.fluxbeats.eu) involving 10 PhD programs.
observatoire.univ-lyon1.fr/actualites/j...
