Fereidoun Rassoulzadegan (1943–2026) Click on the article title to read more.

The last issue of the Limnology and Oceanography Bulletin includes an obituary of our colleague Dr. Fereidoun Rassoulzadegan, former director of our laboratory, prepared by John R. Dolan.
@aslo.org 🌊
aslopubs.onlinelibrary.wiley.com/doi/10.1002/...

Unravelling Marine Benthic Functioning Shifts Under Ocean Acidification Ocean acidification is reshaping temperate shallow marine benthic communities and the way they function. Using community transplants at natural CO2 vents, we show that biodiversity loss under declini...

‼️ New paper, led by @jerem-carlot.bsky.social. Transplantations at CO₂ vents reveal that declining pH drives community shifts:
- photosynthesis and nutrient uptake increase
- biomass and calcification decrease
onlinelibrary.wiley.com/doi/10.1111/...
@imev-mer.fr @iddri.bsky.social 🌊

Japan and the U.S. Agree to Team Up on Seabed Mining

« Japan and the U.S. Agree to Team Up on Seabed Mining
The arrangement could signal a fracture in the decades-long effort among nations to reach consensus on how to mine the ocean floor while protecting ecosystems. »
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www.nytimes.com/2026/03/27/c....

The Polar Academy The world’s sole scientific academy focused on polar regions, interdisciplinary challenges, and gobal perspectives.

It is a tremendous privilege to be elected to The Norwegian Scientific Academy for Polar Research (www.polar-academy.com). I am deeply thankful to my colleagues for their support and confidence, especially to Grete Hovelsrud and Geir Gabrielsen.
🌊 @cnrs.fr @sorbonne-universite.fr @iddri.bsky.social

3/3 In my view, the editor’s decision to publish a rebuttal that fails to address the core issues was a poor choice.
- Original paper: pubmed.ncbi.nlm.nih.gov/40892922
- Our letter: pubmed.ncbi.nlm.nih.gov/41758658
- The reply: pubmed.ncbi.nlm.nih.gov/41758660
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1/x We highlight several flaws and demonstrate that this bold claim lacks data and literature support. It is disheartening that the response (links below) does not adequately address our concerns. 🌊

Scientific evidence does not support oyster farming as a marine carbon dioxide removal strategy for climate mitigation | PNAS Scientific evidence does not support oyster farming as a marine carbon dioxide removal strategy for climate mitigation

1/x ‼️ Check out our letter to @pnas.org, led by Fabrice Pernet, which discusses a paper claiming "Oyster farming acts as a marine carbon dioxide removal (mCDR) hotspot for climate change mitigation." 🌊
doi.org/10.1073/pnas...

Can Nations Agree How to Mine the Sea? This Is the Year, She Says.

www.nytimes.com/2026/02/28/c...
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Synthesis of data products for ocean carbonate chemistry Abstract. As the largest active carbon reservoir on Earth, the ocean is a cornerstone of the global carbon cycle, playing a pivotal role in modulating ocean health and the Earth's climate system. Unde...

‼️New paper led by Liqing Jiang. Overview of 68 existing ocean carbonate chemistry data products and data product sets: compilations of cruise datasets, derived gap-filled data products, model simulations.

@cnrs.fr @iddri.bsky.social @sorbonne-universite.fr @imev-mer.fr

doi.org/10.5194/essd...

3/3 Correcting all errors would be time-consuming, and it is unclear whether edits would be retained. I would welcome colleagues’ views on how best to handle this, as it is worrying to see such misleading content circulating. 🌊

2/3 The page raises concerns: it contains numerous factual inaccuracies about my career, and a section titled “Debates and Critiques in Research Field” misrepresents and criticises findings from papers I co-authored, without citing a single peer-reviewed source. 🌊

1/3 I recently discovered, via a search engine, that an article about me has appeared on Grokipedia, described on Wikipedia as an AI-generated online encyclopedia. 🌊

🌊 Merci @cnrscotedazur.bsky.social !

2/2 Thank you to my family, colleagues, students, and partners — @cnrs.fr @sorbonne-universite.fr @iddri.bsky.social — for your trust, rigor, and collaboration.

Without you, this honour would not exist.

It belongs to you as much as to me. 🌊

1/2 Receiving the insignia of Knight of the Legion of Honour — France’s highest distinction — is an honour I accept with humility and gratitude.

My work in oceanography at @cnrs.fr lies at the heart of this recognition. 🌊

#LegionOfHonor #Oceanography #Climate @imev-mer.fr @iddri.bsky.social

Société Générale: Stop Financing Adani's Coal
action.eko.org/a/societe-ge...

Retiring as emeritus, I thank @cnrs.fr for its Medal of Honor.

Planets embody astronomy, humanity’s first science. Cuneiform quote from the epic of Gilgamesh (7th c. BCE):
“He who saw all, knew the hidden, revealed the secret.”
@cnrscotedazur.bsky.social @imev-mer.fr

Ten years ago today, the Paris Agreement was adopted — a landmark achievement in multilateral diplomacy.

May the spirit of Paris be rekindled to help navigate today’s challenges in global cooperation.

Tightening the Sargassum belt - Nature Geoscience A belt of seaweed has formed across the tropical Atlantic nearly every year since 2011, despite reduction in its extent elsewhere. The causes of this growth are now coming into clearer focus.

Sargassum galore in today's issue of Nature Geosciences!

doi.org/10.1038/s415...
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Predicting potential Arctic kelp distribution and lower‐depth biomass from seafloor irradiance Kelps have an extensive distribution in Arctic coastal waters. However, quantifying their role in the Arctic food web and carbon cycle is challenged by the scarcity of documented geographical distrib....

‼️ Check out our new paper led by Laura Castro de la Guardia.

We estimate the potential kelp biomass from seafloor irradiance. Predicted potential kelp biomass in 6 Arctic fjords in good agreement with published values.

🌊 @iddri.bsky.social @cnrs.fr
aslopubs.onlinelibrary.wiley.com/doi/10.1002/...

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Thanks to Fei Chai and Minhan Dai (Xiamen University) for their invitation to give a seminar on "Ocean science meets diplomacy" based of the links between the One Ocean Science Congress #OOSC and #UNOC3.

Further reading: aslopubs.onlinelibrary.wiley.com/doi/10.1002/...

‼️ Check out our new paper led by Devi Veytia on "A machine learning-based evidence map of ocean-related options for climate change mitigation and adaptation".
@cnrs.fr @iddri.bsky.social @sorbonne-universite.fr @imev-mer.fr
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doi.org/10.1038/s441...

I am sorry that I forgot to add the link… Thanks @scottdoney.bsky.social for posting it!

Honored to be a co-signatory, with other distinguished people, of this commentary led by Prince Albert II of Monaco that promotes a sustainable ocean economy.
@iddri.bsky.social @cnrs.fr @sorbonne-universite.fr
🌊#BlueEconomy

Also, congratulations to @scottdoney.bsky.social who is also a 2025 Highly Cited Researcher. It is great to be in such wonderful company!

Clarivate Highly Cited Researchers 2025 The Highly Cited Researchers 2025 list identifies and celebrates individuals who have demonstrated significant and broad influence in their fields of research. Through rigorous selection criteria and ...

I am honored to be named again among the Highly Cited Researchers. Deep thanks to the students, colleagues, and partners whose work, reviews, and open data enable rigorous research.
🌊 @iddri.bsky.social @cnrs.fr @sorbonne-universite.fr @imev-mer.fr

clarivate.com/highly-cited...

🌊 Utiliser la machine océanique pour éliminer/réduire le CO2 : des méthodes, oui, mais tiennent-elles leur promesses ?

"Les promesses de la pompe océanique" 🫧 #scienceetavenir N°945 à lire dans le dossier consacré au #climat 🌤️ @jpgattuso.bsky.social

Here is a good explanation of ocean oxygen and why it’s more nuanced than often presented 🌊
theconversation.com/humans-will-...