Lmst

We often discuss the threat of #OceanAcidification (and #Climate Change ) on shallow reefs, but it does not spare deep reefs. As the #ocean acidifies, the aragonite saturation horizon shallows, and with it the zone many #reef builders can inhabit.

Link: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JC021750

Cross section of aragonite saturation state (Ωar) across sampling track from Necker to Suiko seamount. The distance along track was based on distance between seamounts beginning at Necker Island (0 m). White contours show 0.5 incremenents of Ωar. Colorbar shows interpolated Ωar based on average depth binned values for each seamount and gray dots show the average depth of discreet samples (see Table S4 in Supporting Information S1 for depth bins). Seamount profiles are indicated by seamount number (top) as follows: 1–Necker, 2–Brooks, 3–French Frigate, 4–East Northampton, 5–West Northampton, 6–Pioneer, 7–Bank 11, 8–Southeast Hancock, 9–Northwest Hancock, 10–Colahan, 11–Kammu, 12–Yuryaku, 13–Koko, 14–Jingu, 15–Yomei, 16–Suiko (see Table S1 in Supporting Information S1 for lat/lon ranges and sampling years and Figure 1 for corresponding map). Black triangles show average depth of scleractinian reefs observed at seamounts from Baco et al., 2017, and 2020, including a triangle indicating reefs found on Academician (to the right of seamount 7), which was not sampled in this study. The left panel represents samples from 2019, while the right represents averages from samples in 2014–2017.

Ocean Acidification Crossed A Critical Boundary, Threatening Marine Ecosystems

"How quickly can we change ocean chemistry without damaging marine ecosystems and its associated ecosystem services?"

#SciComm by @GrrlScientist

#CriticalBoundary #Ocean #OceanAcidification #marine #MarineBiology #Ecosystem https://medium.com/grrlscientist/ocean-acidification-crossed-a-critical-boundary-threatening-marine-ecosystems-ad8463cd3350

Ocean Acidification Crossed A Critical Boundary, Threatening Marine Ecosystems

"How quickly can we change ocean chemistry without damaging marine ecosystems and its associated ecosystem services?"

#SciComm by @grrlscientist

#CriticalBoundary #Ocean #OceanAcidification #marine #MarineBiology #Ecosystem https://medium.com/grrlscientist/ocean-acidification-crossed-a-critical-boundary-threatening-marine-ecosystems-ad8463cd3350

Ocean Acidification Crossed A Critical Boundary, Threatening Marine Ecosystems

"How quickly can we change ocean chemistry without damaging marine ecosystems and its associated ecosystem services?"

#SciComm by @GrrlScientist

#CriticalBoundary #Ocean #OceanAcidification #marine #MarineBiology #Ecosystem #conservation https://medium.com/grrlscientist/ocean-acidification-crossed-a-critical-boundary-threatening-marine-ecosystems-ad8463cd3350

Ocean Acidification Crossed A Critical Boundary, Threatening Marine Ecosystems

"How quickly can we change ocean chemistry without damaging marine ecosystems and its associated ecosystem services?"

#SciComm by @grrlscientist

#CriticalBoundary #Ocean #OceanAcidification #marine #MarineBiology #Ecosystem #conservation https://medium.com/grrlscientist/ocean-acidification-crossed-a-critical-boundary-threatening-marine-ecosystems-ad8463cd3350

From the recent report of the European Environmental Agency. The Exceedance of six of nine planetary boundaries

https://www.eea.europa.eu/en/europe-environment-2025/main-report/exceedance-of-six-of-nine/@@images/preview_image-3751-faa9578e439525702a8347d1e77a42b4.png

#ClimateChange #biodiversity #biosphereintegrity #LandSystemChange #Freshwater #OceanAcidification

The Planetary Health check has now diagnosed ocean acidification to be outside the safe operating space:
https://www.planetaryhealthcheck.org
PIK press release:
https://www.pik-potsdam.de/en/news/latest-news/seven-of-nine-planetary-boundaries-now-breached-2013-ocean-acidification-joins-the-danger-zone

Short article quotes one of the researchers, Levke Caesar, with "I am afraid. This really scares me." https://www.theguardian.com/environment/2025/sep/24/worlds-oceans-fail-key-health-check-as-acidity-crosses-critical-threshold-for-marine-life

I have questions.
For all of the previous 200 million years, CO2 was at a stable 1000ppm. Far higher than our goal-apparent of 600ppm, see picture of temperature and CO2 evolution after Judd, Tierney et al 2024 https://www.science.org/doi/abs/10.1126/science.adk3705

If those little snails from the PIK press release are already negatively affected from today's 430ppm, does that mean, their DNA only evolved during the last 2-3 million years, and rather suddenly, once CO2 dropped below this magical threshold?

Note also how CO2=ocean acidification never caused an extinction, only temperature did.
Surely, if the dying of the little critters were a precursor for an impending marine extinction event, it would have happened before? From 350 to 300 million years ago for example. Ample time for low-acidity-DNA like snails to evolve, and go extinct again when CO2 rose.

Whales have been around for 54mio years, in very high-CO2 times as well. What did they eat if snails weren't on the menu [of their prey]?
What did sharks eat at 1000ppm? They are truly old beings, 350 million years and more.
#PlanetaryBoundaries #climateChange #OceanAcidification #marinelife

Line chart of 485 million years of global temperature °C and CO2 concentration ppm. Also shown are 5 extinction events.
All of which, or at least 4 of them, the sharks survived.
Pre-industrial 280ppm CO2 is a very new invention for the planetary system. The longest near-constant stretch is at 1000ppm, lasting from 50 million years ago all the way back to 250mio years ago. Before 250mio years ago, CO2 wobbled around a lot more, going as high as 2000ppm and as low as 280ppm.
Extinction events are timed by temperature excursions which don't coincide with CO2 peaks or lows.
65mio years ago, the great dinosaur extinction from the meteor impact in Yucatan and temperature drop or shading of the sun.
200mio years ago, a rise by 5°C caused another extinction event.
Another was 250mio years ago due to a rise by 12°C.
370mio years ago, maybe as result of a preceding, slow rise by 8°C, but the chart is not clear in this case.
440mio years ago, an extinction event occurred from a temperature drop of 20°C.

Source: Judd, Tierney et al 2025
https://www.science.org/doi/abs/10.1126/science.adk3705

1-Oct-2025
#Corals might be adapting to #climateChange
((but probably not fast enough I would suspect?))
specifically this is about #oceanAcidification

https://www.eurekalert.org/news-releases/1100489

#science #ClimateCatastrophe #environment #ecology #MarineBiology

WRITER FUEL: Researchers have found that ocean acidification entered a "danger zone" in 2020, suggesting increased carbon dioxide levels have caused Earth to breach another planetary boundary.

https://www.limfic.com/2025/10/02/writer-fuel-ocean-acidification-is-a-ticking-time-bomb/

#WriterFuel #WritingIdeas #Ideas #OceanAcidification #ClimateChange

As we reflect on the impact of climate change, it's essential to consider the role of ocean acidification. According to a recent study published in Nature ( the pH levels of the world's oceans have decreased by approximately 30% since pre-industrial times. This shift has significant consequences for marine ecosystems and our planet as a whole. What are your thoughts on this critical issue? #OceanAcidification

"A new report from the Planetary Boundaries Science Lab at the Potsdam Institute for Climate Impact Research (PIK) reveals that 7 of the 9 critical Earth system boundaries have now been breached"
https://www.pik-potsdam.de/en/news/latest-news/seven-of-nine-planetary-boundaries-now-breached-2013-ocean-acidification-joins-the-danger-zone

#water #OceanAcidification

World’s #oceans fail key health check as #oceanacidification crosses critical threshold for marine life
Latest assessment by Potsdam Institute for #Climate Impact Research, comes at a time of record‑breaking ocean heat and #coralbleaching. Report notes its 7th of 9 planetary boundaries to be transgressed prompting #scientists to call for a renewed global effort to curb #fossilfuels, #deforestation and other human-driven pressures that are tilting #Earth out of equilibrium
https://www.theguardian.com/environment/2025/sep/24/worlds-oceans-fail-key-health-check-as-acidity-crosses-critical-threshold-for-marine-life

"We are witnessing widespread decline in the health of our planet. Even if the diagnosis is dire, the window of cure is still open. Failure is not inevitable; failure is a choice. A choice that must and can be avoided." #ClimateCrisis #OceanAcidification #MarineWildlife #PlanetOverProfit

RE: https://bsky.app/profile/did:plc:2dwxs24526yfvmydneeu63ea/post/3lzno6qyprs27

Oceans Face Critical Health Crisis as Acidity Levels Reach Dangerous Threshold

The world’s oceans have crossed a critical threshold in acidity, marking a significant environmental concern according to the Potsdam Institute for Climate Impact Research. The latest annual assessment reveals that ocean acidity has risen due to human-induced climate change, primarily from fossil fu... [More info]

#oceanacidification #planetaryboudaries #planetaryhealth

World’s oceans fail key health check as acidity crosses critical threshold for marine life | Ocean acidification | The Guardian

'... seven of nine planetry boundaries now transgressed'

https://www.theguardian.com/environment/2025/sep/24/worlds-oceans-fail-key-health-check-as-acidity-crosses-critical-threshold-for-marine-life

#Oceans just hit an ominous milestone
A new report sounds alarm on #oceanacidification as #Earth breaches the seventh of nine "#planetaryboundaries."
Relentless #acidification of the #seas that’s crossed into dangerous territory, threatening all manner of #marine life, including the organisms at the base of the #foodweb.
#Climate is changing rapidly; #humans are using too much #freshwater; we’re driving species to #extinction and transforming the #biosphere
https://grist.org/climate/the-oceans-just-hit-an-ominous-milestone/

World’s oceans fail key health check as acidity crosses critical threshold for marine life https://www.theguardian.com/environment/2025/sep/24/worlds-oceans-fail-key-health-check-as-acidity-crosses-critical-threshold-for-marine-life #Oceanacidification #Climatecrisis #Environment #Marinelife #Wildlife #Science #Oceans

Ocean Acidification Threatens Shark Teeth and Marine Ecosystems

A recent study suggests that sharks could face a serious threat due to ocean acidification, which may weaken their teeth over time. Shark teeth, known for being sharp and constantly regenerating, are essential for their survival as they rely on them for hunting. However, the increase in ocean acidit... [More info]

#OceanAcidification

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