Tag

Ocean Deoxygenation

All articles tagged with #ocean deoxygenation

climate-science1 month ago•8 min saved

New PNAS Study Links End-Permian Extinction Mechanism to Modern Ocean Warming and Oxygen Loss

A 2026 study in the Proceedings of the National Academy of Sciences confirms that the end-Permian mass extinction was driven by 'temperature-dependent hypoxia,' where warming oceans reduced oxygen supply while increasing animal metabolic demand. Researchers led by J. Andres Marquez used lab respirometry and trait-based models to show that slow-metabolizing Paleozoic fauna, such as brachiopods, lost viable habitat and died out, while faster-metabolizing groups like bivalves survived. Although modern oceans are currently warming and losing oxygen, the study emphasizes that current conditions are not a direct forecast of the ancient catastrophe, as the scale and drivers differ significantly.

via Space Daily|

#climate-change #climate-science #end-permian-extinction

earth-science3 months ago•17 min saved

Oceans Run Low on Oxygen, Threatening Earth's Balance

A new review warns that warming oceans and nutrient runoff are depleting dissolved oxygen in water bodies, with global ocean oxygen down ~2% since the 1950s and potentially falling another 1–7% by 2100, a trend that could disrupt aquatic ecosystems and destabilize the biosphere; the study argues aquatic deoxygenation should be added to the Planetary Boundaries framework, proposing indicators like dissolved oxygen concentration, proximity to capacity, shifts in oxygen‑sensitive species, and the Metabolic Index to track risk.

via Gizmodo|

#climate-change #dissolved-oxygen #earth-science

earth-science3 months ago•16 min saved

Ancient Ocean Heatwaves Hint at Today’s Warming Danger

A new study links the Permian-Triassic 'Great Dying' to warming oceans with expanding oxygen-poor waters, showing species most vulnerable to higher temperatures and low oxygen died off at higher rates; the findings serve as a warning that contemporary human-driven warming could trigger a similar marine crisis if carbon emissions aren’t curbed.

via Gizmodo|

#earth-science #global-warming #great-dying

science1 year ago•4 min saved

Ancient Ocean 'Burps' of CO2 and Their Modern Risks

Ancient volcanic activity 183 million years ago caused widespread ocean anoxia, a process that is now being mirrored by modern human-induced CO2 emissions, which are reducing ocean oxygen levels and threatening marine life. Scientists use geochemical methods to study past events, highlighting the long-lasting impact of deoxygenation and emphasizing the urgent need to reduce emissions to prevent similar catastrophic outcomes today.

via Earth.com|

#carbon-dioxide-emissions #climate-change #jurassic-period

environment1 year ago•4 min saved

Carbon Removal Techniques May Cause Ocean Oxygen Shortage

A study warns that some marine carbon dioxide removal methods, especially biological approaches like ocean fertilization and macroalgae farming, could worsen ocean oxygen depletion, potentially harming marine ecosystems, while geochemical methods may be safer alternatives. Careful assessment of these techniques is essential to avoid unintended environmental consequences.

via Indian Defence Review|

#carbon-dioxide-removal #climate-change #environment

science1 year ago•4 min saved

Carbon Removal Techniques May Exacerbate Marine Oxygen Depletion, Study Finds

A recent study warns that some marine carbon dioxide removal methods, especially biological ones like ocean fertilization and macroalgae sinking, could significantly worsen ocean deoxygenation, potentially causing oxygen loss 4 to 40 times greater than current levels, highlighting the need for careful assessment and monitoring of these approaches.

via Phys.org|

#biological-processes #carbon-dioxide-removal #climate-mitigation