Tom Chalk

Snap-shot of all the happy faces at the hybrid PAGES workshop which took place in Bergen, 2022.

Thank you to everyone who came to our workshops & @pages-ipo.bsky.social meeting, contributed to the special issue, the community at large who use our CO2 reconstructions, and of course our funders @erc.europa.eu , @ukri.org, @dfg.de and @leverhulme.ac.uk! pastglobalchanges.org/publications...

Advances and Best Practices in Boron-based Paleo-CO2 Reconstruction: Paleoceanography and Paleoclimatology Click on the title to browse this issue

Also check out the whole special issue, there are some really great papers inside... agupubs.onlinelibrary.wiley.com/doi/toc/10.1...

A figure showing the relative importance of different error sources through time which impact the d11B-CO2 proxy. In general the most important are: analytical, disequilibrium, sea water isotope composition and species calibration.

We look at the history and future of d11B-CO2 reconstructions, as well as their major limitations throughout the last 70 million years. I hope this will be a great resource for boron people new and not new, students and not students! Reach out if you want to know more.

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 ...

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.

Reminder - the exoCean lab is hiring

Still time to apply:

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!

@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)

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!

#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...

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* 😅

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.

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…

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...

👏🏼

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

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!

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

A photograph inside the JD Tata Auditorium in Bengaluru on the Indian Institute of Science campus—the photograph shows a large number of people seateed in the auditorium with Dr. Thomas Chalk (CEREGE) on stage showcasing a slide on CO₂ 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 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! ⏩🏳️‍🌈

Next up @chalkyoceans.bsky.social improving Neogene CO2 reconstructions - proxies, calibrations, morphotypes and much more.. 🙏🏼

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

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...

✨ 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...

🚨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...

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.
🧪⚒️🌊
Contact me if you want more details.

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.

🏅 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...

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!

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.

🏳️‍🌈🏳️‍⚧️

[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/

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 🧪⚒️🌊🪸