iiinova — where your digital self keeps evolving

Reposted by PO2 - Past Ocean Oxygen Working Group

PAGES (Past Global Changes) @pages-ipo.bsky.social · 02/12/2025

Issue 6 of the PAGES PO2 newsletter is out! 🎉 Featuring a Marine Oxygen Loss special issue, PO2 workshop, job opportunities, Data Stewardship updates, conference reports, events & recent publications. Read here 👉 pastglobalchanges.org/news/138771 @pastoxygen.bsky.social

043

Reposted by PO2 - Past Ocean Oxygen Working Group

Gerald Auer @auerg.bsky.social · 11/11/2025

Abstract submission is open for #EGU26 (3 - 8 May 2026) 🚨 Are you working with #microfossils and have a story to tell about the #paleoenvironment and/or #paleoclimate? Then join our session to put a focus lens on these amazing micropaleontological proxies!

296

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 10/11/2025

The theme of the #UNESCO celebration for this year is Trust, Transformation, and Tomorrow: The Science We Need for 2050. We deserve a world at peace, and science is the key to making it happen! Would you join the change?

020

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 10/11/2025

Today’s a special day. it’s World Science Day for Peace and Development! 🌍✨It’s all about boosting public awareness, sharing knowledge, and teaming up across borders. Because when nations unite through science, we get closer to figuring out how to live in a peaceful, sustainable world, together! 🔬🤝💚

142

Reposted by PO2 - Past Ocean Oxygen Working Group

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 01/11/2025

Agglutinated forams (forams that make their shells by adding or agglutinating sorrounding stuff) make their shells by gluing things they find around them: sand, minerals, and skeletons of other organisms! This includes other forams, sponge spicules, even radiolaria! 😱😱

1104

Reposted by PO2 - Past Ocean Oxygen Working Group

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 04/11/2025

In the deep ocean, density differences drive thermohaline circulation as ocean layers have different temperature & salt content. In the shallower ocean, winds also drive circulation & supply oxygen! Today, areas with little oxygen (Oxygen Minimum Zones-OMZ) form where subsurface circulation is slow

The ocean has different layers with different temperatures & salt content that result in density differences that drive the thermohaline circulation and the Atlantic Meridional Overturning Circulation (AMOC), a global circulation system that absorbs carbon and heat from the atmosphere & distributes it.

This happens in the deep ocean, and in the shallower ocean, other factors like winds also drive circulation, and supply, among other things, oxygen!

131

Reposted by PO2 - Past Ocean Oxygen Working Group

PAGES (Past Global Changes) @pages-ipo.bsky.social · 04/11/2025

🏆 Congratulations to Dr. Sofía Barragán-Montilla, recipient of the 2026 PAGES Early-Career Award (ECA) Sofía uses tiny fossils, foraminifera, to uncover big stories about our oceans’ past. 🌊Thank you for your inspiring contributions to #paleoceanography 👉https://pastglobalchanges.org/news/138727

pastglobalchanges.org

PAGES announces 2026 Early-Career Award recipient: Dr. Sofía Barragán-Montilla | PAGES

2145

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 04/11/2025

*In addition, this is happening with intense ocean warming seen in the Atlantic in weak AMOC times. In theory, ocean warming makes oxygen less soluble & should decrease, BUT the results show that circulation is the main oxygen control here! Full study: www.nature.com/articles/s41...

nature.com

Enhanced ventilation of Eastern North Atlantic Oxygen Minimum Zone with deglacial slowdown of Meridional Overturning - Nature Communications

The authors traced back the oxygen changes of the last 27,000 years from an east Atlantic Ocean archive. They found that oxygen increase with reduced Atlantic deep circulation is related to intensifie...

000

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 04/11/2025

In summary, we infer that a weak AMOC-driven heat transport decrease led to a strong temperature gradient between the tropical & NAtlantic, that accelerated subsurface circulation, bringing more oxygen to the OMZ we studied. Did you learn something new? Follow us and share! 🌊🐚🔬🤔

Did you learn something new or have questions? Comment below! Follow us on LinekdIn and Instagram and share Past Ocean Oxygen Knowledge!

100

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 04/11/2025

Findings: with a slow AMOC there was + oxygen, suggesting a stronger subsurface circulation that brought + oxygen to the OMZ🧐Since winds' strength depends on temperature & air pressure, we calculated the sea surface temperature diff. between tropical & NAtlantic: they were larger with a slow AMOC 😱

In the last 27.000 years, AMOC has slowed on 2 occasions. Our oxygen reconstruction shows that in those times, there was more oxygen, meaning the subsurface circulation was accelerated and brought more oxygen to the OMZ 🧐Since winds' strength depends on temperature and air pressure changes, we compared the differences between the tropical and northermost Atlantic sea surface temperatures and found that these are larger with a slow AMOC 😱

100

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 04/11/2025

AMOC slowed 2 times in the last 27k years, and to understand what happens to subsurface circulation with this slowdown, the authors reconstructed oxygen changes using benthic forams distribution in the OMZ off the Senegal coast.

Today, areas with little oxygen occur where subsurface circulation is lower: "Oxygen Minimum Zones or OMZs"
Here, we used a seafloor archive of the eastern tropical Atlantic OMZ, next to Senegal. We reconstruct oxygen changes in the last 27.000 years with benthic forams (seafloor microscopic organisms that produce a shell that fossilizes) distribution that is sensitive to oxygen changes

100

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 04/11/2025

131

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 01/11/2025

Ok.. maybe nor skeletons, but they definetly use fossil remains of dead organisms to make their shell or is it ... their House of Horrors! 😱😱😱🤣 and you? You have any Science horror story?

100

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 01/11/2025

1104

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 01/11/2025

Forams are super cute, but some of them are just spooky 🎃Did you know some forams make their shells gluing “skeletons” of other fossils?

295

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 26/09/2025

📣Don’t miss out! You can still register for the PO2 Second Workshop!🌊 We invite the #ocean#oxygen community to our #PO2workshop. Announced Past Global Changes, Past Ocean Oxygenation and NC Museum of Natural Sciences. Scan the QR for details on our #registration. @pages-ecn.bsky.social

152

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 29/08/2025

Pretty cool, right? Can you think of other shell features or clues that could serve as proxies? Share your ideas in the comments! Post by @sofigerina.bsky.social @dharmarx.bsky.social sebastiangarrido #pastoceanoxygenation #scicomm #paleoclimate #proxies #foraminifera #timemachines

010

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 29/08/2025

Scientists study how micro-organisms such as foraminifera respond to today’s ocean conditions, then use those patterns to infer what oceans were like thousands or even millions of years ago. By comparing past and present, they can reconstruct Earth’s climate history.

110

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 29/08/2025

Hi again, Oxyguys!!🤓🌍🌊“Proxies: Windows into the Past” Did you know scientists can uncover past climates using proxies? These are measurable clues preserved in marine sediments—like tiny “time machines” recording signals of temperature, oxygen, or salt. @pages-ipo.bsky.social @pages-ecn.bsky.social

165

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 14/08/2025

¿Aprendiste algo nuevo o tienes preguntas? déjala en los comentarios! Ilustración y textos por María Yolanda Nuñez; textos y edición por Sofía Barragán Montilla @sofigerina.bsky.social #pastoceanoxygen #scicomm #bilingual #paleoecology #oxygen #marinescience #paleoscience #darkoxygen #paperalert

000

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 14/08/2025

Estos hallazgos podrían cambiar lo que sabemos sobre la vida marina y cómo el océano abisal se mantiene oxigenado. Impresionante, ¿verdad?

100

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 14/08/2025

El estudio se hizo en una zona cubierta de nódulos polimetálicos, por lo que los autores plantean que el alto voltaje de los nódulos dio lugar a la electrólisis, un proceso por el cual se descomponen las moléculas de agua en oxígeno e hidrógeno.

100

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 14/08/2025

Investigadores instalaron cámaras bentónicas en el fondo marino abisal del Océano Pacífico para cuantificar el oxígeno en un periodo de tiempo y ¡los datos muestran más oxígeno del esperado! lo que sugiere que en las profundidades del océano también se produce O₂

100

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 14/08/2025

📑🔬¿Sabes qué es el oxígeno oscuro? Un estudio publicado en Nature Geoscience muestra un descubrimiento sorprendente: más oxígeno del esperado en el océano profundo. Aquí, el oxígeno proviene de la ventilación de aguas menos profundas y es consumido por organismos para respirar y oxidar materia.

132

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 12/08/2025

Impressive right? If you learned something new or have other questions leave it in the comments, we will do our best to reply. This is a post Maria Yolanda Nuñez (Illustration and texts) and @sofigerina.bsky.social (text and edits).

010

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 12/08/2025

Since the chambers were located in a polymetallic nodule-covered zone. Their hypothesis: high voltage of nodules enabled electrolysis to break down water molecules into oxygen & hydrogen. The findings could change what we know about ocean life, chemistry & how the abyssal ocean remains oxygenated.

110

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 12/08/2025

The researchers installed benthic chambers in the Pacific Ocean abyssal seafloor to quantify oxygen over a period of time. The data shows more oxygen than expected, suggesting additional O2 was being produced!

110

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 12/08/2025

📑🔬You asked about dark oxygen, here it is! In Nature Geosciences, a study shows a striking discovery: more oxygen than expected in the abyssal ocean. Here, oxygen is mostly supplied by ventilation from shallower waters, & it is consumed by organisms through respiration and oxidation of matter.

141

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 09/08/2025

🗣📢Abstract submission is now open for the OSM 2026 (Ocean Science Meeting) We invite the #ocean #isotope community to our MASIS - SCOR session. Join us at the conference. 👉 Scan the QR for details on our session and travel #funding options. #OSM26 🌊

033

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 08/08/2025

📣 Abstract submission is open for the Ocean Science Meeting!🌊We invite the #ocean #oxygen community to our PO2 session on #past, #present, & #future #deoxygenation. Join us at the conference. 👉 Scan the QR for details on our session and travel #funding options.@pages-ipo.bsky.social @agu.org #OSM26

021

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 05/08/2025

📖 Read the latest and previous editions here: 👉 www.pastglobalchanges.org/science/wg/po2/newsletters 📬 Want updates in your inbox? Sign up for our mailing list here: 👉 login.eduid.ch/idp/profile/... #po2newsletter

pastglobalchanges.org

Newsletters | PAGES

000

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 05/08/2025

📣Exciting Announcement: PO2 Newsletter – 5th Edition is out! 🔬 🌊 🌏 We’re happy to share the new edition of the Past Ocean Oxygenation (PO2) Newsletter! This issue features updates on major events and recent research related to ocean oxygenation in the past. @pages-ipo.bsky.social

124

Reposted by PO2 - Past Ocean Oxygen Working Group

Laura Cotton @lauraminifera.bsky.social · 29/07/2025

🎉Are you a mineralogist who also loves museums? 🎉 Come join the Natural History Museum Denmark! We are looking for an assistant professor and curator of mineralogy. Advert can be found below, but apply soon! Deadline is 11th August😱 candidate.hr-manager.net/ApplicationI...

candidate.hr-manager.net

211-0241/25-2N Tenure-track Assistant Professor and Curator in Mineralogy at Natural History Museum Denmark

189

Reposted by PO2 - Past Ocean Oxygen Working Group

Sofía Barragán-Montilla @sofigerina.bsky.social · 30/07/2025

🤔 Did you know that with a weaker #AMOC tropical shallower waters got + oxygen in the last deglacial? 😱 Using benthic #forams, we explore how #AMOC influences Atlantic shallow circulation 🌊🐚🔬👩‍🚀 www.nature.com/articles/s41... @marumunibremen.bsky.social @natcomms.nature.com

01710

Reposted by PO2 - Past Ocean Oxygen Working Group

Sofía Barragán-Montilla @sofigerina.bsky.social · 20/07/2025

🚨Our new @natcomms.nature.com paper is out! 🤔Did you know that with a weaker #AMOC, tropical shallower waters got + oxygen in the last deglacial? Using benthic #forams, we explore how deep #AMOC influences Atlantic shallow circulation 🌊🐚🔬👩‍🚀 www.nature.com/articles/s41... @marumunibremen.bsky.social

2248

Reposted by PO2 - Past Ocean Oxygen Working Group

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 11/06/2025

📢The Past Ocean Oxygenation @pages-ipo.bsky.social Working Group is here! 🚤 We provide insights into the natural variability of seawater oxygen in key periods of the geological record & communicate the science behind oxygen reconstructions 🐳 PO2 is here! pastglobalchanges.org/science/wg/p...

11611

Reposted by PO2 - Past Ocean Oxygen Working Group

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 27/06/2025

Hi again!📝¿Oxígeno Disuelto en el Océano (OD)? 🌊🤓¿Sabes qué es? Hablemos de algunos conceptos básicos que usaremos en nuestras futuras publicaciones para hablar de la oxigenación oceánica en el pasado. Los científicos usan equipos especializados para medir el OD en el océano. @pages-ipo.bsky.social

144

Reposted by PO2 - Past Ocean Oxygen Working Group

MARUM @marumunibremen.bsky.social · 17/07/2025

New study: More oxygen in the oxygen-minimum zone associated with weaker Atlantic overturning circulation - now in Nature Communications. @marumunibremen.bsky.social @kielunimarine.bsky.social @sofigerina.bsky.social #ClimateChange #AMOC #OceanScience #Foraminifera #PaleoData

1138

Reposted by PO2 - Past Ocean Oxygen Working Group

Anya Hess @anya-hess.bsky.social · 16/07/2025

In this paper, we present new global calibrations for the I/Ca proxy for ocean oxygenation, with the first Pacific transect. By comparing data from planktonic foram species that live at different water depths, we gain a better understanding of the proxy and its relationship to O2 #paleoceanography

South-North cross section through the eastern tropical Pacific oxygen minimum zone. It shows the north and south lobe of the oxygen minimum zone, separated by the equatorial undercurrent. The Peru-Chile current and California Current ventilate the near-surface waters, North Pacific Intermediate waters bring low-oxygen waters to the northern lobe at ~550m, and Antarctic Intermediate Waters ventilate the southern lobe at the same depth. The oxygen minimum zone is fueled by Ekman upwelling and remineralization of sinking organic material.

1178

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 15/07/2025

En el siguiente código QR encontrarán información sobre nuestra sesión y opciones de financiación para viajes. El tema principal de la AGU este año son las conexiones entre la comunidad de ciencias de la tierra y el espacio. @pages-ipo.bsky.social

010

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 15/07/2025

Hola 🤓🌊🌎 querida comunidad que estudia el #oxígeno en nuestros #océanos. 💡📑Ya está abierto el envío de resúmenes para la Reunión Americana de Geociencias @agu.org . Los invitamos a nuestra sesión PO2 sobre la #desoxigenación #pasada, #presente y #futura.

120

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 15/07/2025

Hi 🤓🌊🌍ocean oxygen community. 💡📑Abstract submission is now open for the American Geoscience Meeting - AGU @agu.org. We want to invite you to join our PO2 session about past, present and future deoxygenation. In the following QR you will find information about our session and travel funding options.

142

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 04/07/2025

🤔⁉️📝Si aprendiste algo nuevo o tienes preguntas acerca de los forams déjalas en los comentarios. Síguenos si quieres aprender más de los foraminíferos y lo que nos puede decir acerca del oxígeno oceánico pasado.🐚 #micropaleontologia #foraminiferos #bentonicos #planctônicos #paleoclima #paleoambiente

020

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 04/07/2025

Dependiendo de cómo viven pueden ser planctónicos (si flotan en la superficie oceánica) o bentónicos (si viven sobre o en el suelo océanico). Los primeros forams eran bentónicos y evolucionaron a formas planctónicas mucho después.

121

PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 04/07/2025

Los Forams, construyen una concha alrededor de su célula conocida como “conchilla” que puede ser de diversas formas y tamaños. Además poseen una especie de tentáculos llamados “pseudópodos” que usan para moverse y alimentarse.

110