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Tom Chalk

@chalkyoceans.bsky.social

Dr Chalk, destined to be a researcher in carbonates, CO2, & ocean-climate links, resident isotope geochemist @exoceanlab.bsky.social, @cerege.bsky.social, France. Equalist, technologist, environmentalist. #climatevegan. πŸ‡¬πŸ‡§πŸ€πŸ‡²πŸ‡«. πŸ³οΈβ€πŸŒˆ but always with the πŸ³οΈβ€βš§οΈ.

986 Followers  |  251 Following  |  27 Posts  |  Joined: 05.10.2023  |  1.9564

Latest posts by chalkyoceans.bsky.social on Bluesky

Still time to apply:

04.10.2025 15:36 β€” πŸ‘ 4    πŸ” 4    πŸ’¬ 0    πŸ“Œ 0
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The lab keeps evolving and we are THRILLED! More equipment is about to arrive, some more is planned, and we feel super excited about our different projects. Also really… what a view when the doors are open, one can even see the emblematic « sainte victoireΒ Β» behind the trees!

02.10.2025 09:55 β€” πŸ‘ 11    πŸ” 3    πŸ’¬ 2    πŸ“Œ 2
@chalkyoceans and Maxime on a boat fishing forams.

@chalkyoceans and Maxime on a boat fishing forams.

He doesn't just do the lab either, he's happy to brave the waves and come help us sample in the field. Go Maxime! (Here in the middle of the Atlantic, May 25)

02.10.2025 10:25 β€” πŸ‘ 6    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Slowly but surely the lab we had in our heads with @sulpis.bsky.social and @chalkyoceans.bsky.social is coming to life. High pressure incubators are about to come, more microscopy equipments… Such a nice adventure has started!

02.10.2025 10:01 β€” πŸ‘ 7    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
Lecturer in Earth Sciences Lecturer in Earth Sciences

#Lecturer position in #EarthSciences πŸ‘‡πŸΌ@openuniversity.bsky.social

Please apply, if interested πŸ™πŸΌ

Closing Date: 20 October 2025
Contract Type: #Permanent
Fixed Term Contract/End Date: Not Applicable

jobs.open.ac.uk/job/Lecturer...

29.09.2025 14:42 β€” πŸ‘ 14    πŸ” 13    πŸ’¬ 0    πŸ“Œ 2

Come work in our lab! All the usual awesome things apply about doing exciting science, plus this one might save the world! @sulpis.bsky.social hiring a 2 year position to observe and model deep ocean processes using high-pressure reactors.

*Goes to gather a bunch of forams to be dissolved* πŸ˜…

29.09.2025 15:35 β€” πŸ‘ 7    πŸ” 6    πŸ’¬ 0    πŸ“Œ 0

Sediments dissolving on the seafloor can act as a long term sink for carbon dioxide emissions. We're bringing it to the lab, deep sea research from the comfort of Southern France!

Postdoctoral position for 2 years available working with @sulpis.bsky.social in the @exoceanlab.bsky.social.

29.09.2025 15:28 β€” πŸ‘ 8    πŸ” 3    πŸ’¬ 1    πŸ“Œ 3
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The authigenic and detrital neodymium isotopic composition in the modern Mediterranean Sea: implications for paleocirculation proxy Neodymium isotopic composition (143Nd/144Nd or Ξ΅Nd) has been used as a tracer of water mass provenance in the modern and the past oceans. However, rec…

Nice comparison of foram-coating derived and sediment derived #Ndisotopes in the Mediterranean from Kazuyo Tachikawa and others @climatecerege.bsky.social and @cerege.bsky.social. Small cautionary tale for unrestricted use (of sediment), but normally it works!

www.sciencedirect.com/science/arti...

19.09.2025 07:30 β€” πŸ‘ 8    πŸ” 5    πŸ’¬ 0    πŸ“Œ 0

πŸ‘πŸΌ

04.09.2025 06:21 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Watch this space for so much new exciting science from the new influx of Ceregiens. @cerege.bsky.social

04.09.2025 05:03 β€” πŸ‘ 9    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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Day 4, #ICP15, next up @antacl.bsky.social talking about long term evolution of South Asian Summer Monsoon.

Congratulations to @antacl.bsky.social for starting her new position soon πŸ₯³
@climatecerege.bsky.social @cerege.bsky.social

04.09.2025 04:39 β€” πŸ‘ 12    πŸ” 4    πŸ’¬ 0    πŸ“Œ 3
Anta delivering her #ICP15 talk in Bengaluru.

Anta delivering her #ICP15 talk in Bengaluru.

Future (and past) @climatecerege.bsky.social superstar @antacl.bsky.social giving her #ICP15 talk now. Modelling the Indian monsoon in the Miocene, and some important praise to the organisers for their diverse programme of speakers. Bravo!

04.09.2025 04:40 β€” πŸ‘ 24    πŸ” 8    πŸ’¬ 0    πŸ“Œ 0

@tdegaridel.bsky.social and @soniachaabane.bsky.social too. Miso is getting a lot of attention! #nomoreforampicking.

02.09.2025 17:17 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
A photograph inside the JD Tata Auditorium in Bengaluru on the Indian Institute of Science campusβ€”the photograph shows a large number of people seateed in the auditorium with Dr. Thomas Chalk (CEREGE) on stage showcasing a slide on COβ‚‚ reconstructions.

A photograph inside the JD Tata Auditorium in Bengaluru on the Indian Institute of Science campusβ€”the photograph shows a large number of people seateed in the auditorium with Dr. Thomas Chalk (CEREGE) on stage showcasing a slide on COβ‚‚ reconstructions.

This week, I am grateful to be at the International Conference on Paleoceanography #ICP15. Great start this morning with a tour of #Boron isotopes & #Cenozoic COβ‚‚ reconstructions from @eleniwater.bsky.social & @chalkyoceans.bsky.social. Nice to see all the paleoceanographers in #Bengaluru!

01.09.2025 05:03 β€” πŸ‘ 22    πŸ” 4    πŸ’¬ 0    πŸ“Œ 0

Thank you so much for the invitation #ICP15. Diversity makes us stronger, and the data shows it! β©πŸ³οΈβ€πŸŒˆ

02.09.2025 17:11 β€” πŸ‘ 14    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0
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Next up @chalkyoceans.bsky.social improving Neogene CO2 reconstructions - proxies, calibrations, morphotypes and much more.. πŸ™πŸΌ

01.09.2025 04:11 β€” πŸ‘ 8    πŸ” 1    πŸ’¬ 0    πŸ“Œ 1

A new paper from our team, and the opportunity to introduce Jaime Suarez @jysuarezibarra.bsky.social , postdoc in our micropaleontology group!

30.07.2025 15:47 β€” πŸ‘ 8    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0
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Inauguration du laboratoire BISSAP Γ  l’UCAD : un nouveau centre de rΓ©fΓ©rence pour la surveillance des Γ©cosystΓ¨mes aquatiques en Afrique de l’Ouest | Site Web IRD Le 21 juillet 2025, l’UniversitΓ© Cheikh Anta Diop de Dakar (UCAD) a inaugurΓ© le laboratoire BISSAP (Bioindicateurs, Imagerie et Surveillance des SystΓ¨mes Aquatiques et PΓ©lagiques), en prΓ©sence de Mous...

✨ Honored to witness the inauguration of the BISSAP lab at UCAD β€” a new lab for ecosystem monitoring in Senegal! πŸŒπŸ”¬
Huge congratulations to everyone involved!
@climatecerege.bsky.social @ird-fr.bsky.social
#ScienceForAll #UCAD #IRD #Biodiversity #Africa #BISSAP
www.ird.fr/inauguration...

30.07.2025 16:56 β€” πŸ‘ 12    πŸ” 6    πŸ’¬ 0    πŸ“Œ 1
PLANKTONIC FORAMINIFERA TEST SIZE DICTATED BY CONDITIONS IN LIFE AND POST-MORTEM | Journal of Foraminiferal Research | GeoScienceWorld ABSTRACT. In this study, we quantify the impact of environmental conditions (temperature, productivity, and salinity) and taphonomic (carbonate

🚨New paper alert🚨

Using the mean and 95th percentile of cross-sectional area measurements, we documented ecological and taphonomic imprints on the test size variation of planktonic foraminifera.

@soniachaabane.bsky.social @chalkyoceans.bsky.social @tdegaridel.bsky.social

doi.org/10.61551/gsj...

28.07.2025 16:14 β€” πŸ‘ 12    πŸ” 7    πŸ’¬ 1    πŸ“Œ 2
Open position for PhD student / Postdoc in biogeochemistry
For a fully funded four-year project exploring environmental and
ecological dynamics in the Mediterranean and Red Sea, we seek a top
tier PhD student or postdoc. The project aims to understand the
formation and persistence of biodiversity hotspots, especially in light of
global climate change and local stressors. The ultimate goal is to
gather insights across different organizational levels, from molecular,
organismal, and community to habitat structure and biogeochemical
pathways, in order to construct comprehensive models that forecast
the future dynamics and fate of these ecosystems under changing
conditions. This position would be focused on a key aspect of this
project – the variability of seafloor fluxes and their interaction with the
microbial community to facilitate the habitability of shallow (up to 40 m)
and mesophotic (up to 200 m) biodiversity hotspots such as reefs.

Interested candidates, please contact by email Dr. Or Bialik (obialik@ocean.org.il) or Prof. Eyal Rahav (eyal.rahav@ocean.org.il) with a letter of motivation, CV, and contact details of at least one referee for this post not later than the 28th of August 2025.

Open position for PhD student / Postdoc in biogeochemistry For a fully funded four-year project exploring environmental and ecological dynamics in the Mediterranean and Red Sea, we seek a top tier PhD student or postdoc. The project aims to understand the formation and persistence of biodiversity hotspots, especially in light of global climate change and local stressors. The ultimate goal is to gather insights across different organizational levels, from molecular, organismal, and community to habitat structure and biogeochemical pathways, in order to construct comprehensive models that forecast the future dynamics and fate of these ecosystems under changing conditions. This position would be focused on a key aspect of this project – the variability of seafloor fluxes and their interaction with the microbial community to facilitate the habitability of shallow (up to 40 m) and mesophotic (up to 200 m) biodiversity hotspots such as reefs. Interested candidates, please contact by email Dr. Or Bialik (obialik@ocean.org.il) or Prof. Eyal Rahav (eyal.rahav@ocean.org.il) with a letter of motivation, CV, and contact details of at least one referee for this post not later than the 28th of August 2025.

I have a fully funded open #position for a PhD student/postdoc in marine #biogeochemistry. As part of the MARBEDS project, we are seeking someone to study seafloor fluxes and their interactions with microbial communities in biodiversity hotspots.
πŸ§ͺβš’οΈπŸŒŠ
Contact me if you want more details.

15.07.2025 07:10 β€” πŸ‘ 31    πŸ” 41    πŸ’¬ 1    πŸ“Œ 5
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NanoCLICS: A New Approach to Understanding Carbon Dynamics in Soils - CEREGE Isabelle Basile-Doelsch, Director of Research at INRAE and based at CEREGE, has been working for several years on the dynamics of carbon in soils, an area of particular concern for the environment.

πŸ… Congratulations to Isabelle Basile-Doelsch, Research Director at INRAE/CEREGE, for winning an @erc.europa.eu Advanced Grant for her NanoCLICS project.

Learn more about her project: www.cerege.fr/en/nanoclick...

23.06.2025 08:19 β€” πŸ‘ 9    πŸ” 4    πŸ’¬ 0    πŸ“Œ 1
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Tenure-Track Junior Professor Chairs | Site Web IRD Procedures and timetable for pre-selections and auditions for junior professorships.

New job alert! We just opened a tenure-track Junior professor Chair at @cerege.bsky.social focused on the study of the critical zone in the Mediterranean and intertropical Africa. More info on the IRD website here:
en.ird.fr/tenure-track...
Contact me if you are interested!

21.05.2025 16:38 β€” πŸ‘ 13    πŸ” 14    πŸ’¬ 0    πŸ“Œ 1
Ooops, a foot pic. Sporting Bermuda pride sock.

Ooops, a foot pic. Sporting Bermuda pride sock.

It's #pride month, and whilst I'm still in Bermuda, far away from my regular life I'm reflecting on the world for LGBTQ+ folk, which seems to have gotten just a little bit worse this year... But we're not going away, and not giving up on making things better.

πŸ³οΈβ€πŸŒˆπŸ³οΈβ€βš§οΈ

01.06.2025 17:44 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
[Person with ponytail wearing lab coat hands balloon to another person in front of a springboard, a magnet hanging from above, and then a target] PERSON WITH PONYTAIL to Person 2: Rub this balloon against your head, then go jump past that magnet toward the target on the wall. [caption] Before the bathroom scale was invented, the only way to weigh people was mass spectrometry.

[Person with ponytail wearing lab coat hands balloon to another person in front of a springboard, a magnet hanging from above, and then a target] PERSON WITH PONYTAIL to Person 2: Rub this balloon against your head, then go jump past that magnet toward the target on the wall. [caption] Before the bathroom scale was invented, the only way to weigh people was mass spectrometry.

Mass Spec

xkcd.com/3094/

29.05.2025 19:26 β€” πŸ‘ 3913    πŸ” 466    πŸ’¬ 28    πŸ“Œ 24
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Every night is a disco for our foraminifera in their respiration chambers @biosstation.bsky.social with @case4climate.bsky.social @chalkyoceans.bsky.social @juliemeilland.bsky.social πŸ§ͺβš’οΈπŸŒŠπŸͺΈ

28.05.2025 15:58 β€” πŸ‘ 36    πŸ” 6    πŸ’¬ 1    πŸ“Œ 0

Thank you for coming, it's been inspirational and I'm so glad we made it work. *Nothing stops the foram whisperer*. 🐚🀫

24.05.2025 14:52 β€” πŸ‘ 6    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Fieldwork needs fieldwork hair, and like this the forams can't see me coming in the turquoise waters around Bermuda. πŸ§œπŸΌβ€β™‚οΈ

20.05.2025 12:33 β€” πŸ‘ 21    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0
About 12 juvenile pteropods as seen through a microscope.

About 12 juvenile pteropods as seen through a microscope.

Back in France, exoCean is still working hard...
🐚✨ A tiny miracle in the lab!
For the first time in our team’s history, we’ve successfully harvested pteropod egg sacs and captured the moment of their eclosion on film.

12.05.2025 16:06 β€” πŸ‘ 6    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0

Excited to have hundreds of baby Forams in the lab after the first towing - different species - different behaviors! @exoceanlab.bsky.social @chalkyoceans.bsky.social

07.05.2025 13:55 β€” πŸ‘ 12    πŸ” 3    πŸ’¬ 0    πŸ“Œ 0
Tom with a fresh plankton sample about to be poured into the collection bucket. It's white so they stay cool on the way back to the lab.

Tom with a fresh plankton sample about to be poured into the collection bucket. It's white so they stay cool on the way back to the lab.

We then collect the live plankton and try to keep them alive long enough to get to the lab. There we can look at how they respond to different conditions in a controlled setting. (And if you know @chalkyoceans.bsky.social, you know there will be boron involved).

07.05.2025 13:50 β€” πŸ‘ 6    πŸ” 2    πŸ’¬ 0    πŸ“Œ 0

@chalkyoceans is following 20 prominent accounts