Schematic from Rai et al. 2026, GRL, showing how the glacial maximum ~20000 yrs ago had an expanded oxygen minimum zone in the Arabian Sea compared to the deglaciation and Holocene
Led by PRL student Deepak Rai, we recently had a new paper out showing that the Oxygen Minimum Zone in the Arabian Sea *expanded* in size during the last glacial cycle @arvindocean.bsky.social agupubs.onlinelibrary.wiley.com/doi/full/10....
Four oceanographic sections and a small inset globe showing a meridional survey line in the Pacific Ocean. The two plots on the left show δ3He (%) and the two on the right show ΔHe (%), with the top row plotted against neutral density (γn) in kg m−3 and the bottom row plotted against depth in meters. The x-axis for all plots represents Latitude, ranging from 20°S to 55°N. The color scales use a "cool-to-warm" gradient, where deep blue represents lower values (roughly 12% for δ3He and 3.5% for ΔHe) and bright pink/white indicates high-concentration plumes (exceeding 32% and 7.5%, respectively). These high-value plumes are most prominent in the mid-depths between 2,000 and 3,000 meters, particularly near the equator and 20°N, suggesting hydrothermal injection. The bottom plots include a jagged grey silhouette representing the seafloor bathymetry, featuring a prominent ridge peak near 20°N that coincides with a localized helium maximum.
One of the dumbest claims from climate deniers is that ocean warming is from deep-sea volcanoes. ³He in the deep ocean comes from volcanoes, and if heat and carbon did too, the ocean temp and carbon distribution would be similar to ³He (they’re not).
agupubs.onlinelibrary.wiley.com/doi/10.1029/...
In fact those who publish more, they hardly accept to review.
This happens when everyone wants to publish but no one wants to review. I found mostly early career people review these days, not more than 5% of the mid and late career people accept to review. The day early career people stop, most manuscripts would meet a fate like this one, sadly.
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 🌊
rdcu.be/eMTV2?utm_ca...
Still looking for 1 more guest editor :-)
🌊
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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#PRW2025 #AGUPubs #PeerReviewWeek
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...
Image description:a coffee cup, a notepad, a pen, and descriptive text reading:" Participation benefits: Gain confidence in scientific reviewing Learn about the open peer review process in EGU journals and general features of peer review Get the answers to your questions Upon successfully completing the course, participants will be added to the Copernicus Referee Database EGU peer review training workshop 2025 – apply now!"
Are you looking to gain experience with peer review of scientific manuscripts? After two very successful editions, #EGU is once again offering our Members FREE #PeerReview Training!
📆 Application deadline: 31 July 2025.
Apply Now and make full use of many participation benefits!
🔗: egu.eu/6DU4E4
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
Photo of a coral reef
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.
🔗 buff.ly/f8ms6T3
#AGUPubs #Oceans #Coral #STEM #Oceanography #OceanScience @jgroceans.bsky.social
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...
🎉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!
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....
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/...
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