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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

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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!

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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! 🔬🤝💚

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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! 😱😱

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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!

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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

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

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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?

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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

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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

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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.

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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.

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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 🌊

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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

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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

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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

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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

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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

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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...

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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

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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

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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.

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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.

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

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.

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 02/07/2025

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.

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

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PO2 - Past Ocean Oxygen Working Group @pastoxygen.bsky.social · 26/06/2025

📝Ocean Dissolved Oxygen?🌊🤓 Do you know what it is❓ We are gonna talk about some general concepts we will use in future posts to talk about past ocean oxygenation. Scientists use special equipment to measure DO in modern oceans. @pages-ipo.bsky.social

It is measured in μmol/kg (micromoles/ kilogram): the concentration of oxygen molecules (O2) in a kilogram of water. Solubility plays an important role in the amount of dissolved oxygen in ocean waters. It increases when ocean waters are colder, with lower pressure and low salinity.

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

PO2 is now live on Bluesky and LinkedIn, bringing past ocean oxygen to new corners of the world! Spread the word and follow us over there! 🌊🐚🔬🚀 www.linkedin.com/company/past...

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

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