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.
🇬🇧🤝🇲🇫. 🏳️🌈 but always with the 🏳️⚧️.
@cerege.bsky.social, France.
Equalist, technologist, environmentalist. #climatevegan.
🇬🇧🤝🇲🇫. 🏳️🌈 but always with the 🏳️⚧️.
So excited to see how this revolutionises foraminifera work. Well done and deserved @juliemeilland.bsky.social, but not sure I can ever forgive you for getting me into the "living stuff" !!
@juliemeilland.bsky.social won this year’s Alan Higgins Award! We cite: « her pioneering work on planktonic foraminifera - including the first multi-generational lab cultures - has transformed how we study and apply these vital microfossils. »
Yay!
Yay!
I was awarded the Alan Higgins Award by @micropalaeosoc.bsky.social for my work on planktonic foraminifera reproduction and culture. I feel very honored and can only thank all the great colleagues who supported me along the way in Norway, Ireland, the UK, Germany and France!
November 7, 2025 at 2:53 PM
So excited to see how this revolutionises foraminifera work. Well done and deserved @juliemeilland.bsky.social, but not sure I can ever forgive you for getting me into the "living stuff" !!
Reposted by Tom Chalk
This is cool, 6 million year old ice from Antartica with inferred temperature ~12°C warmer than the late Pleistocene. No CO2 level yet! (That will be highly anticipated!)
www.pnas.org/doi/10.1073/...
www.pnas.org/doi/10.1073/...
PNAS
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans...
www.pnas.org
October 28, 2025 at 8:51 PM
This is cool, 6 million year old ice from Antartica with inferred temperature ~12°C warmer than the late Pleistocene. No CO2 level yet! (That will be highly anticipated!)
www.pnas.org/doi/10.1073/...
www.pnas.org/doi/10.1073/...
Just realised that this is as close to an "M2-M2" project as you are likely to get.
Explore the aftermath of one of the most interesting features of the Pliocene, MIS M2 during your M2 internship!
www.sciencedirect.com/science/arti...
Explore the aftermath of one of the most interesting features of the Pliocene, MIS M2 during your M2 internship!
www.sciencedirect.com/science/arti...
October 27, 2025 at 4:12 PM
Just realised that this is as close to an "M2-M2" project as you are likely to get.
Explore the aftermath of one of the most interesting features of the Pliocene, MIS M2 during your M2 internship!
www.sciencedirect.com/science/arti...
Explore the aftermath of one of the most interesting features of the Pliocene, MIS M2 during your M2 internship!
www.sciencedirect.com/science/arti...
Reposted by Tom Chalk
Are you looking for a master's internship (5-6 months)?
Constraining tropical planktonic foraminifera depth habitats in a (past) high-CO2 world 🥵🌎
Come to @climatecerege.bsky.social, south of France☀️🇫🇷
Deadline: 15 Nov 2025.
Start: Jan-Mar 2026.
More info👇
nuage.osupytheas.fr/s/fdAEGQXkwA...
Constraining tropical planktonic foraminifera depth habitats in a (past) high-CO2 world 🥵🌎
Come to @climatecerege.bsky.social, south of France☀️🇫🇷
Deadline: 15 Nov 2025.
Start: Jan-Mar 2026.
More info👇
nuage.osupytheas.fr/s/fdAEGQXkwA...
stage_M2_Suarez-Ibarra.pdf
Nuage - le Nuage de l'OSU Pytheas
nuage.osupytheas.fr
October 15, 2025 at 3:10 PM
Are you looking for a master's internship (5-6 months)?
Constraining tropical planktonic foraminifera depth habitats in a (past) high-CO2 world 🥵🌎
Come to @climatecerege.bsky.social, south of France☀️🇫🇷
Deadline: 15 Nov 2025.
Start: Jan-Mar 2026.
More info👇
nuage.osupytheas.fr/s/fdAEGQXkwA...
Constraining tropical planktonic foraminifera depth habitats in a (past) high-CO2 world 🥵🌎
Come to @climatecerege.bsky.social, south of France☀️🇫🇷
Deadline: 15 Nov 2025.
Start: Jan-Mar 2026.
More info👇
nuage.osupytheas.fr/s/fdAEGQXkwA...
Wonder what carbon was doing in the oceans before humans were around to see? We'll use the chemistry of tiny shells on the seafloor to find out how carbon moved between the ocean and atmosphere over 1 million years ago.
Come work with us in 2026 for your M2 internship @climatecerege.bsky.social.
Come work with us in 2026 for your M2 internship @climatecerege.bsky.social.
Are you looking for a master's internship (5-6 months)?
Early Pleistocene deep ocean carbon storage in the Caribbean Sea 🌎🌊
Come to
@climatecerege.bsky.social, south of France☀️🇫🇷
Deadline: 30 Nov 2025.
Start: Jan-Feb 2026.
More info👇
nuage.osupytheas.fr/s/AF4qYHA4CQ...
Early Pleistocene deep ocean carbon storage in the Caribbean Sea 🌎🌊
Come to
@climatecerege.bsky.social, south of France☀️🇫🇷
Deadline: 30 Nov 2025.
Start: Jan-Feb 2026.
More info👇
nuage.osupytheas.fr/s/AF4qYHA4CQ...
Deep_ocean_carbon_storage_M2.pdf
Nuage - le Nuage de l'OSU Pytheas
nuage.osupytheas.fr
October 27, 2025 at 4:00 PM
Wonder what carbon was doing in the oceans before humans were around to see? We'll use the chemistry of tiny shells on the seafloor to find out how carbon moved between the ocean and atmosphere over 1 million years ago.
Come work with us in 2026 for your M2 internship @climatecerege.bsky.social.
Come work with us in 2026 for your M2 internship @climatecerege.bsky.social.
Interested in improving our knowledge of climate by looking into the past? In the Pliocene the earth was hotter than today, but carbon dioxide was "about the same".
Come work with us in 2026 looking at where this crucial information comes from, and how to make it better during an M2 internship.
Come work with us in 2026 looking at where this crucial information comes from, and how to make it better during an M2 internship.
Are you looking for a master's internship (5-6 months)?
Constraining tropical planktonic foraminifera depth habitats in a (past) high-CO2 world 🥵🌎
Come to @climatecerege.bsky.social, south of France☀️🇫🇷
Deadline: 15 Nov 2025.
Start: Jan-Mar 2026.
More info👇
nuage.osupytheas.fr/s/fdAEGQXkwA...
Constraining tropical planktonic foraminifera depth habitats in a (past) high-CO2 world 🥵🌎
Come to @climatecerege.bsky.social, south of France☀️🇫🇷
Deadline: 15 Nov 2025.
Start: Jan-Mar 2026.
More info👇
nuage.osupytheas.fr/s/fdAEGQXkwA...
stage_M2_Suarez-Ibarra.pdf
Nuage - le Nuage de l'OSU Pytheas
nuage.osupytheas.fr
October 27, 2025 at 3:52 PM
Interested in improving our knowledge of climate by looking into the past? In the Pliocene the earth was hotter than today, but carbon dioxide was "about the same".
Come work with us in 2026 looking at where this crucial information comes from, and how to make it better during an M2 internship.
Come work with us in 2026 looking at where this crucial information comes from, and how to make it better during an M2 internship.
New paper(s) alert! Check out @agu.org Palaeoceanography & Paleoclimate. Including our piece on best practices going forward for d11B-CO2 reconstructions. agupubs.onlinelibrary.wiley.com/doi/10.1029/...
including @case4climate.bsky.social, @michaelhenehan.bsky.social,... @eleniwater.bsky.social.
including @case4climate.bsky.social, @michaelhenehan.bsky.social,... @eleniwater.bsky.social.
Perspectives for Best Practices in Boron‐Based CO2 Reconstruction
Boron isotopes are an important marine paleoclimate proxy to reconstruct past ocean pH and atmospheric carbon dioxide in geological time Sources of uncertainty of past CO2 estimation shifts from ...
agupubs.onlinelibrary.wiley.com
October 9, 2025 at 12:59 PM
New paper(s) alert! Check out @agu.org Palaeoceanography & Paleoclimate. Including our piece on best practices going forward for d11B-CO2 reconstructions. agupubs.onlinelibrary.wiley.com/doi/10.1029/...
including @case4climate.bsky.social, @michaelhenehan.bsky.social,... @eleniwater.bsky.social.
including @case4climate.bsky.social, @michaelhenehan.bsky.social,... @eleniwater.bsky.social.
Reposted by Tom Chalk
Reminder - the exoCean lab is hiring
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 victoire » behind the trees!
October 2, 2025 at 1:18 PM
Reminder - the exoCean lab is hiring
Reposted by Tom Chalk
Still time to apply:
📢We're hiring!📢
We have a permanent Lecturer in Earth Sciences position available in @OU_EEE
@OpenUniversity
£47,389 to £56,535
Closing Date: 20 October 2025*
We are a friendly, research intensive school with supportive colleagues and great labs.
jobs.open.ac.uk/job/Lecturer...
We have a permanent Lecturer in Earth Sciences position available in @OU_EEE
@OpenUniversity
£47,389 to £56,535
Closing Date: 20 October 2025*
We are a friendly, research intensive school with supportive colleagues and great labs.
jobs.open.ac.uk/job/Lecturer...
Lecturer in Earth Sciences
Lecturer in Earth Sciences
jobs.open.ac.uk
October 4, 2025 at 3:36 PM
Still time to apply:
Reposted by Tom Chalk
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 victoire » behind the trees!
October 2, 2025 at 9:55 AM
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 victoire » behind the trees!
Reposted by Tom Chalk
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!
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 victoire » behind the trees!
October 2, 2025 at 10:01 AM
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!
Reposted by Tom Chalk
#Lecturer position in #EarthSciences 👇🏼@openuniversity.bsky.social
Please apply, if interested 🙏🏼
Closing Date: 20 October 2025
Contract Type: #Permanent
Fixed Term Contract/End Date: Not Applicable
jobs.open.ac.uk/job/Lecturer...
Please apply, if interested 🙏🏼
Closing Date: 20 October 2025
Contract Type: #Permanent
Fixed Term Contract/End Date: Not Applicable
jobs.open.ac.uk/job/Lecturer...
Lecturer in Earth Sciences
Lecturer in Earth Sciences
jobs.open.ac.uk
September 29, 2025 at 2:42 PM
#Lecturer position in #EarthSciences 👇🏼@openuniversity.bsky.social
Please apply, if interested 🙏🏼
Closing Date: 20 October 2025
Contract Type: #Permanent
Fixed Term Contract/End Date: Not Applicable
jobs.open.ac.uk/job/Lecturer...
Please apply, if interested 🙏🏼
Closing Date: 20 October 2025
Contract Type: #Permanent
Fixed Term Contract/End Date: Not Applicable
jobs.open.ac.uk/job/Lecturer...
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* 😅
*Goes to gather a bunch of forams to be dissolved* 😅
🌟 Postdoc Opportunity in Marine Biogeochemistry at CNRS-CEREGE!
🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France!
⬇️
🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France!
⬇️
September 29, 2025 at 3:35 PM
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* 😅
*Goes to gather a bunch of forams to be dissolved* 😅
Reposted by Tom Chalk
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.
Postdoctoral position for 2 years available working with @sulpis.bsky.social in the @exoceanlab.bsky.social.
🌟 Postdoc Opportunity in Marine Biogeochemistry at CNRS-CEREGE!
🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France!
⬇️
🚢 Are you a passionate researcher ready to tackle climate change? Dive into the ERC-funded Deep-C project in Aix-en-Provence, France!
⬇️
September 29, 2025 at 3:28 PM
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.
Postdoctoral position for 2 years available working with @sulpis.bsky.social in the @exoceanlab.bsky.social.
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...
www.sciencedirect.com/science/arti...
The authigenic and detrital neodymium isotopic composition in the modern Mediterranean Sea: implications for paleocirculation proxy
Neodymium isotopic composition (143Nd/144Nd or εNd) has been used as a tracer of water mass provenance in the modern and the past oceans. However, rec…
www.sciencedirect.com
September 19, 2025 at 7:30 AM
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...
www.sciencedirect.com/science/arti...
👏🏼
My besties! ♥️
@chalkyoceans.bsky.social & @antacl.bsky.social
Science has never been about competition!
It’s about sharing, learning, and enjoying the journey together.
Thank you for being such wonderful researchers and friends!
#ICP15
@climatecerege.bsky.social
@chalkyoceans.bsky.social & @antacl.bsky.social
Science has never been about competition!
It’s about sharing, learning, and enjoying the journey together.
Thank you for being such wonderful researchers and friends!
#ICP15
@climatecerege.bsky.social
September 4, 2025 at 6:21 AM
👏🏼
Watch this space for so much new exciting science from the new influx of Ceregiens. @cerege.bsky.social
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 🥳
@climatecerege.bsky.social @cerege.bsky.social
Congratulations to @antacl.bsky.social for starting her new position soon 🥳
@climatecerege.bsky.social @cerege.bsky.social
September 4, 2025 at 5:03 AM
Watch this space for so much new exciting science from the new influx of Ceregiens. @cerege.bsky.social
Reposted by Tom Chalk
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 🥳
@climatecerege.bsky.social @cerege.bsky.social
Congratulations to @antacl.bsky.social for starting her new position soon 🥳
@climatecerege.bsky.social @cerege.bsky.social
September 4, 2025 at 4:40 AM
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 🥳
@climatecerege.bsky.social @cerege.bsky.social
Congratulations to @antacl.bsky.social for starting her new position soon 🥳
@climatecerege.bsky.social @cerege.bsky.social
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!
September 4, 2025 at 4:41 AM
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!
Reposted by Tom Chalk
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 CO₂ reconstructions from @eleniwater.bsky.social & @chalkyoceans.bsky.social. Nice to see all the paleoceanographers in #Bengaluru!
September 1, 2025 at 5:03 AM
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 CO₂ reconstructions from @eleniwater.bsky.social & @chalkyoceans.bsky.social. Nice to see all the paleoceanographers in #Bengaluru!
Thank you so much for the invitation #ICP15. Diversity makes us stronger, and the data shows it! ⏩🏳️🌈
Lovely to hear from @chalkyoceans.bsky.social about need for #diversity (of careers, people, methods and
minds) that underpins our working 🙏🏼 #ICP15
minds) that underpins our working 🙏🏼 #ICP15
Next up @chalkyoceans.bsky.social improving Neogene CO2 reconstructions - proxies, calibrations, morphotypes and much more.. 🙏🏼
September 2, 2025 at 5:11 PM
Thank you so much for the invitation #ICP15. Diversity makes us stronger, and the data shows it! ⏩🏳️🌈
Reposted by Tom Chalk
Next up @chalkyoceans.bsky.social improving Neogene CO2 reconstructions - proxies, calibrations, morphotypes and much more.. 🙏🏼
September 1, 2025 at 4:12 AM
Next up @chalkyoceans.bsky.social improving Neogene CO2 reconstructions - proxies, calibrations, morphotypes and much more.. 🙏🏼
Reposted by Tom Chalk
A new paper from our team, and the opportunity to introduce Jaime Suarez @jysuarezibarra.bsky.social , postdoc in our micropaleontology group!
🚨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...
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...
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
doi.org
July 30, 2025 at 3:47 PM
A new paper from our team, and the opportunity to introduce Jaime Suarez @jysuarezibarra.bsky.social , postdoc in our micropaleontology group!
Reposted by Tom Chalk
✨ Honored to witness the inauguration of the BISSAP lab at UCAD — a new lab for ecosystem monitoring in Senegal! 🌍🔬
Huge congratulations to everyone involved!
@climatecerege.bsky.social @ird-fr.bsky.social
#ScienceForAll #UCAD #IRD #Biodiversity #Africa #BISSAP
www.ird.fr/inauguration...
Huge congratulations to everyone involved!
@climatecerege.bsky.social @ird-fr.bsky.social
#ScienceForAll #UCAD #IRD #Biodiversity #Africa #BISSAP
www.ird.fr/inauguration...
Inauguration du laboratoire BISSAP à l’UCAD : un nouveau centre de référence pour la surveillance des écosystèmes aquatiques en Afrique de l’Ouest | Site Web IRD
Le 21 juillet 2025, l’Université Cheikh Anta Diop de Dakar (UCAD) a inauguré le laboratoire BISSAP (Bioindicateurs, Imagerie et Surveillance des Systèmes Aquatiques et Pélagiques), en présence de Mous...
www.ird.fr
July 30, 2025 at 5:00 PM
✨ Honored to witness the inauguration of the BISSAP lab at UCAD — a new lab for ecosystem monitoring in Senegal! 🌍🔬
Huge congratulations to everyone involved!
@climatecerege.bsky.social @ird-fr.bsky.social
#ScienceForAll #UCAD #IRD #Biodiversity #Africa #BISSAP
www.ird.fr/inauguration...
Huge congratulations to everyone involved!
@climatecerege.bsky.social @ird-fr.bsky.social
#ScienceForAll #UCAD #IRD #Biodiversity #Africa #BISSAP
www.ird.fr/inauguration...
Reposted by Tom Chalk
🚨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...
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...
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
doi.org
July 28, 2025 at 4:14 PM
🚨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...
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...