PO2 - Past Ocean Oxygen Working Group
The working group’s scientific goal is to provide crucial insights into the natural variability of seawater dissolved oxygen concentrations during key time periods in the geological record.
- Reposted by PO2 - Past Ocean Oxygen Working GroupIssue 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
- Reposted by PO2 - Past Ocean Oxygen Working GroupAbstract 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!
- 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! 🔬🤝💚
- 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?
- Very proud to see our own @sofigerina.bsky.social shine! 🤩🌟💙
- 🏆 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
- Reposted by PO2 - Past Ocean Oxygen Working Group🏆 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
- 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
- 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.
- 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 😱
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View full thread*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...
- Forams are super cute, but some of them are just spooky 🎃Did you know some forams make their shells gluing “skeletons” of other fossils?
- 📣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
- 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
- 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.
- 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
- 📑🔬¿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.
- 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
- 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.
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View full thread¿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
- 📑🔬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.
- 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!
- 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.
- 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).
- 🗣📢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 🌊
- 📣 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
- Reposted by PO2 - Past Ocean Oxygen Working Group🧐 You can also read more about it here www.marum.de/en/Oxygen-AM... @dharmarx.bsky.social @oceano2.bsky.social @kielunimarine.bsky.social @pastoxygen.bsky.social @geolatinas.bsky.social
- 📣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
- 📖 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
- Reposted by PO2 - Past Ocean Oxygen Working Group🎉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...
- Reposted by PO2 - Past Ocean Oxygen Working Group🤔 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
- Reposted by PO2 - Past Ocean Oxygen Working Group🚨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
- Reposted by PO2 - Past Ocean Oxygen Working Group📢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...
- Reposted by PO2 - Past Ocean Oxygen Working GroupHi 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
- Reposted by PO2 - Past Ocean Oxygen Working GroupNew 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
- Reposted by PO2 - Past Ocean Oxygen Working GroupIn 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
- 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.
- The main topic of AGU this year is connections in the Earth and space science community. @pages-ipo.bsky.social #pastoceanoxygen #pastoceanoxygenation #scicomm #bilingual #paleoclimate #climatescience #paleoecology #oxygen #marinescience #ocean #science #paleoscience
- 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
- Hola otra vez !!!🤓🌊🌎 (pero en Español)💡 Hoy vamos a hablar de foramíniferos con la ayuda de SciCoForams una iniciativa de comunicación científica de @sofigerina.bsky.social Los foraminíferos o abreviado “forams” 🐚son organismos unicelulares que habitan los océanos desde hace 541 millones de años.
- 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.
- 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.
- 🤔⁉️📝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
- Hi again!🤓🌊🌎 Today, we want to talk to you about foraminifera with the help of SciCoForams an independent #scicomm initiative by Sofía Barragán-Montilla @sofigerina. Foraminifera, or “Forams”🐚 for short, are single-celled organisms that have lived in the ocean for over 541 million years.
- Forams build a shell around their cell called “test” that can have different shapes and sizes. They also have sort of tentacles known as “pseudopods” that they can use to move and catch food.
- Depending on how they live, they can be planktic (if they float on the upper ocean) or benthic (if they live over or in the ocean floor). The first forams were benthic, and the planktic forms evolved many millions of years later.
- 🤔⁉📝If you learned something new or have any questions about forams, leave them in the comments! Follow us if you want to learn more about forams and what they can tell us about the past ocean oxygen.🐚 #pastoceanoxygen #scicomm #foraminifera #paleoscience #micropaleontology #benthic #planktonic
- Reposted by PO2 - Past Ocean Oxygen Working Group
Less ocean O₂ overall, with strong regional shifts—incl. hypoxia in the Mediterranean due to monsoon-driven stratification. Read here: cp.copernicus.org/articles/21/... @good-ocean-oxy.bsky.social @pastoxygen.bsky.social @katrinmeissner.bsky.social @oceano2.bsky.social
