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oxygen

A shallow, narrow creek cuts through the backyard of a home.
Posted inNews

Hypoxia Affects One in Eight Rivers Worldwide

by J. Besl 19 April 202319 April 2023

A global study found dangerously low levels of dissolved oxygen in rivers around the world. The true prevalence of hypoxia is probably even higher.

A panoramic view of rocky mounds on a rust-colored Martian landscape
Posted inNews

Does This Mineral Indicate Oxygen on Mars?

by Elise Cutts 30 January 202330 January 2023

Manganese oxides are thought to be a signature of atmospheric oxygen. But on the Red Planet, recent results suggest they might be more of a red herring.

Posted inEditors' Highlights

Respiration Quotient Variability and Ocean Oxygen Levels

by Eileen Hofmann 1 November 20221 November 2022

Respiration quotients in the Atlantic and Pacific Oceans reflect different water temperature, nutrient stress and phytoplankton community structure, important for regional carbon and oxygen cycling.

diagram of a subduction zone
Posted inEditors' Highlights

Tracing Oxidizing Slab Fluids in Cold Volcanic Arcs

by Susanne Straub 28 October 202215 November 2022

Elevated copper isotope ratios in arc magmas from fluid-rich cold subduction zones support the role of oxidizing fluids from the subducted lithospheric serpentinite in the oxidization of arc magmas.

A person stands amid tall trees on a lush green mountainside.
Posted inResearch Spotlights

Amazon Basin Tree Rings Hold a Record of the Region’s Rainfall

Rachel Fritts, Science Writer by Rachel Fritts 11 October 202221 June 2023

New research provides a 200-year reconstruction of interannual rainfall in the Amazon basin using oxygen isotopes preserved in tree rings in Ecuador and Bolivia.

Artistic impression of an orange-colored early Earth
Posted inNews

Early Life Learned to Love Oxygen Long Before It Was Cool

by Jennifer Schmidt 16 September 202221 February 2023

Laboratory experiments show that earthquakes may have helped early life evolve in an oxygen-free world.

An image of fish and bubbles in the ocean
Posted inResearch Spotlights

Short-Term Events Can Shrink the Habitable Zone in Oceans

Sarah Derouin, Science Writer by Sarah Derouin 12 August 202212 August 2022

A new study looks at habitat reduction during low-oxygen events, spurring the question, Could short-term events provide a window into the long-term health of oceans?

Posted inEditors' Highlights

New Tool to Decipher Past Upper Troposphere Temperatures

by Susan Trumbore 9 August 20229 February 2023

Small variations in clumped O2 isotopes reflect temperatures in the upper troposphere. Bubbles measured in polar ice cores show the global lapse-rate appears to steepen during the Last Glacial Maximum.

Vancouver Island rising above the Strait of Juan de Fuca.
Posted inResearch Spotlights

Tracing Water Particles Back in Time

Aaron Sidder, freelance science writer by Aaron Sidder 22 July 202222 July 2022

Every summer, a low-oxygen pool settles off Canada’s western coast. A new study uses robust modeling to track the origins of the dense water.

A tiny Arctic cod takes shelter underneath pack ice.
Posted inNews

Without Deep Emissions Cuts, Marine Species Face Mass Extinction

Rishika Pardikar, Science Writer by Rishika Pardikar 17 June 20221 June 2023

On the basis of how much oxygen marine species need and how much is available, researchers predict extinctions comparable to those at the end of the Permian under a business-as-usual emissions scenario.

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