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PO2 - Past Ocean Oxygen Working Group

@pastoxygen.bsky.social

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.

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PO2 - Past Ocean Oxygen Working Group@pastoxygen.bsky.social · 10mo ago

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 · 10mo ago

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!
PO2 - Past Ocean Oxygen Working Group@pastoxygen.bsky.social · 10mo ago

Very proud to see our own @sofigerina.bsky.social shine! 🤩🌟💙

PAGES (Past Global Changes)@pages-ipo.bsky.social · 10mo ago

🏆 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

PO2 - Past Ocean Oxygen Working Group@pastoxygen.bsky.social · 10mo ago

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!
PO2 - Past Ocean Oxygen Working Group@pastoxygen.bsky.social · last yr.

📑🔬¿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 · last yr.

📑🔬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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Anya Hess@anya-hess.bsky.social · last yr.

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.
UNSW Climate Change Research Centre@ccrc.bsky.social · last yr.

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

Simulated ocean oxygenation during the interglacials MIS 5e and MIS 9e

Abstract. Recent studies investigating future warming scenarios have shown that the ocean oxygen content will continue to decrease over the coming century due to ocean warming and changes in oceanic c...

cp.copernicus.org