Arvind Singh

Ventilation of the North Atlantic is Weakening 20 January 2026 / Kiel. The renewal of deep waters in the North Atlantic has slowed markedly over the past three decades. This is shown by a new study from the GEOMAR Helmholtz Centre for Ocean Resear...

Ocean waters are aging? What?
Yes: oceanographers call 'age' the time since deep ocean water was last in touch with the atmosphere. It is a measure of 'ventilation', deep vertical overturning of the ocean.
Data show this process is slowing: #AMOC slowdown. Bad news. 🌊
www.geomar.de/en/news/arti...

JGR–Oceans is seeking Editors and Associate Editors across all areas of ocean science—with particular interest in expertise related to Lagrangian dynamics, ocean color remote sensing, air–sea coupling, sea level, circulation theory, and ocean change. Join us in shaping the future of ocean research!

Western Indian subantarctic phytoplankton blooms fertilized by iron-enriched Agulhas water Nature Geoscience - Recurrent phytoplankton blooms in the western Indian Subantarctic Zone are largely supported by iron-rich water transported into the region by the Agulhas Current, according to...

Western Indian subantarctic phytoplankton blooms fertilized by iron-enriched Agulhas water 🌊

rdcu.be/eMTV2?utm_ca...

Still looking for 1 more guest editor :-)
🌊

Technical note: Ocean Alkalinity Enhancement Pelagic Impact Intercomparison Project (OAEPIIP) Abstract. Ocean alkalinity enhancement (OAE) aims to transfer carbon dioxide (CO2) from the atmosphere to the ocean by increasing the capacity of seawater to store CO2. The potential effects of OAE-in...

We are currently proposing a special issue in Biogeosciences to publish individual experiments of the "Ocean Alkalinity Enhancement Pelagic Impact Intercomparison Project #OAEPIIP".

Let me know if you are keen to serve as guest editors for the special issue ☺️
🌊

bg.copernicus.org/articles/21/...

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Need to calibrate your δ18Osw-based proxies, but can't find the right data? We've got you, FAIR! Check out our new @pages-ipo.bsky.social seawater δ18O database preprint at ESSD! (With Alyssa Atwood, @thomasfelis.bsky.social, @kimcobb.bsky.social, and more!) 🌊🧪

essd.copernicus.org/preprints/es...

Wrapped up an inspiring week at #ICP15 🌊 It was a privilege to share my research and exchange ideas with such an incredible community of paleoceanographers. And also, thrilled to receive honourable mention for the poster.
Grateful to @arvindocean.bsky.social for the guidance 🌊 🌏

#ICP15 presents first panel discussion on #Biogeochemistry and #Climate 🙏🏼
@chalkyoceans.bsky.social @jfarmersalmanac.bsky.social @eleniwater.bsky.social @seavdavis.bsky.social @alexauderset.bsky.social
Arvind Singh
and conveyors Adina Paytan and Harshit Singh
Along with stage volunteers 🙏🏼

A picture of Dr. Arvind Singh on stage at ICP15, with him in the bottom left corner (under a spotlight) and a screen behind him with a slide that is titled "Mechanisms to understand the oxygen changes"

Happening now at #ICP15: Arvind Singh from Physical Research Labs, Ahmedabad, talks about #iodine (I/Ca) measurements in planktic #foraminifera from Arabian Sea #sediments recording glacial-era expansion of the oxygen minimum zone.

A @natgeosci.nature.com Research Briefing about our publication: www.nature.com/articles/s41... 🌊

Nature India highlights the research activities conducted onboard SA Agulhas during the 12th Indian Scientific Expedition to the Southern Ocean. www.nature.com/articles/d44...

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YouTube video by GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel Happy World Ocean Day! Introducing the campaign FUTURO - Future West African Marine Ecosystem

Today is World Ocean Day! 🌊

On this special day we want to present the #FUTURO research campaign off West Africa. Find out more in the video:

youtu.be/DXVY7EgwMnA?...

#WorldOceanDay

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Happy #WorldOceanDay! 🌊

In AGU's JGR: Oceans, you can read the latest research about the ocean, it's complex processes, and interactions with other components of the Earth system.

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#AGUPubs #Oceans #Coral #STEM #Oceanography #OceanScience @jgroceans.bsky.social‬

Extreme Indian summer monsoon states stifled Bay of Bengal productivity across the last deglaciation Nature Geoscience - Changes in terrestrial runoff into the Bay of Bengal during both extremely weak and strong Indian summer monsoon phases since the Last Glacial Maximum caused a collapse in...

New paper alert 🚨🚨 Here we posit a non-linear relationship between Indian Summer #Monsoon (ISM) intensity & marine productivity in the Bay of #Bengal: extremely weak & strong #ISM states of the last 22,000 yrs were *both* associated with sharp disruptions to primary production! (1/6)

rdcu.be/ejJD2

Plots illustrating the mechanisms of upper-ocean stratification in the Bay of Bengal and their impacts on primary production inferred from foraminiferal geochemistry

⚒️ Article: Changes in terrestrial runoff into the Bay of Bengal during both extremely weak and strong Indian summer monsoon phases since the Last Glacial Maximum caused a collapse in marine primary production linked to increased stratification

www.nature.com/articles/s41...

Annual variation in 3H concentration in the North Pacific during the pre-Fukushima period.

In August 2023, Japan began discharging 1.4 million tons of treated water from Fukushima. Yu et al., synthesize tritium measurements in the North Pacific since the 1950s showing that tritium release from Fukushima remains within safe limits 🌊

agupubs.onlinelibrary.wiley.com/doi/full/10....

Screenshot of the European Geosciences Union (EGU) General Assembly 2025 website showing the session details for "Session US2 – Marine Carbon Dioxide Removal: Fostering Earth Science Forces for Combating Global Warming." The session is scheduled for Friday, May 2, 2025, from 14:00 to 15:40 CEST in Room E1. It is chaired by Giulia Faucher, Carolin Löscher, and Gerhard Herndl. The program includes a 5-minute introduction, speaker presentations, a discussion on marine carbon dioxide removal (mCDR), and audience questions. Featured speakers are Louis Legendre (France), Daria Atamanchuk (Canada), and David Ho (USA). The session is hybrid with Zoom access. 🌊

I'm on an mCDR panel at #EGU25, but I just learned that our convener Carolin Löscher from Denmark won't be there.

She's been diagnosed with a rare and aggressive form of cancer whose expensive treatment is only available in the US and UAE.

Please consider helping: www.gofundme.com/f/help-for-m...

Effects of ocean alkalinity enhancement on plankton in the Equatorial Pacific Communications Earth & Environment - Olivine-based ocean alkalinity enhancement can disrupt phytoplankton communities, whereas sodium hydroxide has a negligible impact on plankton, according to...

🎉New publication alert! 🌊
We tested how different ocean alkalinity enhancement (OAE) substances—NaOH, olivine, and steel slag—affect plankton in the Equatorial Pacific🌞.
🫙Repeatitive onboard incubations, open ocean data.
Check it out 👉: rdcu.be/egM0x
#OAE #ClimateChange #CDR

Congratulations Mar!

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The AGU will always stand by and represent the scientific community 🧬⚛️🌊🔭🔬

Addressing global Earth Science challenges requires an equitable, diverse, and inclusive scholarly community where researchers must be freely able to discuss their research.

agupubs.onlinelibrary.wiley.com/doi/full/10....

Commitment to Advance Excellence and Inclusion in the Earth and Space Sciences Scholarly Publications We affirm our commitment to publishing evidence-based Earth and space sciences that is free from political interference We will continue to foster a diverse, equitable, and inclusive scientific c...

Some defiance for science! 🌊🌏🧪 @agu.org

We affirm our commitment to publishing evidence-based Earth and space sciences that is free from political interference

We will continue to foster a diverse, equitable, and inclusive scientific community because it improves the quality of science

🔬Science must remain free from political interference.

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Overview of oxygen “stage” nomenclature used in this review. From top to bottom shows the ranges most often associated with the descriptive terms OMZ, oxygen-deficient zone (ODZ), anoxia, dysoxia/hypoxia, and anoxia in seawater. Oxygen concentrations are shown on a log-linear scale along with a simplified schematic of several proxy-relevant components of other redox-sensitive reactions. Chemical concentrations other than oxygen are non-dimensional, but all relate to scales. The redox ladder is modified from Canfield and Thamdrup (2009).

#WeekendReading: Hoogakker (and 67 other people) go into the current state of low-oxygen proxies currently in use in paleoceanography. It's a small book (95 pages), more than a paper, and covers a lot. 🧪⚒️
bg.copernicus.org/articles/22/...

Diazotrophy in the Indian Ocean: Current understanding and future perspectives Dinitrogen (N2) fixation provides the major source of reactive nitrogen in the open ocean, sustaining biological productivity. The Indian Ocean (IO) covers 22% of the ocean surface, while it only rep....

very happy to see our review as a #TopCitedArticle in @aslo.org L&O Letters aslopubs.onlinelibrary.wiley.com/doi/full/10....

@subhadeepchowdhury.bsky.social

Writing your first science paper? Wondering where to start? Write an abstract first to troubleshoot and refine the research question, your main results, and conclusions. @jgroceans.bsky.social @agu.org

Climate Change Science On Mauna Loa Could Stop Amid Federal Cuts The NOAA office in Hilo that supports that carbon dioxide sampling has been flagged for a possible lease cancellation.

The Mauna Loa CO₂ record is the most iconic time series in the environmental sciences. Trump and his enablers are trying to kill it.

🚨 #NOAA is essential for weather forecasting, climate research, and public safety.

AGU stands with the scientific community in urging Congress to protect and strengthen NOAA, not dismantle it.

Our economy, environment, and safety depend on it.

AGU urges US commitment to climate science The U.S. must restore critical climate science leadership for a secure, prosperous future for the country and the world.

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