by Jones et al., Jan 2023 in NatureGeoscience Abtsract Large-igneous-province volcanic activity during the mid-Cretaceous triggered a global-scale episode of reduced marine oxygen levels known as Oceanic Anoxic Event 2 approximately 94.5 million years ago. It has been hypothesized that this geologically rapid degassing of volcanic carbon dioxide altered seawater carbonate chemistry, affecting marine ecosystems, … Continuer la lecture de Abrupt episode of mid-Cretaceous ocean acidification triggered by massive volcanism→
by K. Hansen, Feb 22, 2022 in WUWT There have been a couple of mentions of the decline effect over the past month, mostly prompted by a recent paper that appeared in PLOS BIOLOGY authored by Jeff Clements, Josefin Sundin, Timothy Clark, and Fredrik Jutfelt titled “Meta-analysis reveals an extreme “decline effect” in the impacts … Continuer la lecture de The Decline Effect – Part 1: Ocean Acidification→
by R. Alexander, June 28, 2021 in ScienceUnderAttack In the news recently have been two revelations about the sometimes controversial world of coral reef research. The first is fraud allegations against research claiming that ocean acidification from global warming impairs the behavior of coral reef fish. The second is an about-face on inflated estimates for … Continuer la lecture de Fishy Business: Alleged Fraud over Ocean Acidification Research, Reversal on Coral Extinction→
by P. Homewood, May 7, 2021 in NotaLotofPeopleKnowThat When Philip Munday discussed his research on ocean acidification with more than 70 colleagues and students in a December 2020 Zoom meeting, he wasn’t just giving a confident overview of a decade’s worth of science. Munday, a marine ecologist at James Cook University (JCU), Townsville, was speaking … Continuer la lecture de Does ocean acidification alter fish behavior? Fraud allegations create a sea of doubt→
by Northwestern University, Dec 21, 2020 in ScienceDaily Around 120 million years ago, the earth experienced an extreme environmental disruption that choked oxygen from its oceans. Known as oceanic anoxic event (OAE) 1a, the oxygen-deprived water led to a minor — but significant — mass extinction that affected the entire globe. During this age in … Continuer la lecture de Volcanic eruptions directly triggered ocean acidification during Early Cretaceous→
by WOODS HOLE OCEANOGRAPHIC INSTITUTION, August, 28, 2020 in WUWT Scientists have long suspected that ocean acidification is affecting corals’ ability to build their skeletons, but it has been challenging to isolate its effect from that of simultaneous warming ocean temperatures, which also influence coral growth. New research from the Woods Hole Oceanographic Institution (WHOI) reveals … Continuer la lecture de Claim: Ocean acidification causing coral ‘osteoporosis’ on iconic reefs→
by C. Idso, March10, 2020 in ClimateChangeDispatch Paper Reviewed: Clark, T.D., Raby, G.D., Roche, D.G., Binning, S.A., Speers-Roesch, B., Jutfelt, F. and Sundin, J. 2020. Ocean acidification does not impair the behavior of coral reef fishes. Nature 577: 370-375. In an incredibly important and revealing paper published in the journal Nature, Clark et al. (2020) write … Continuer la lecture de Study: No Evidence Ocean Acidification Harms Coral Reef Fish Behavior→
by Norwegian University of Science and Technology, Jan. 9, 2020 in WUWT A three-year, comprehensive study of the effects of ocean acidification challenges previous reports that a more acidic ocean will negatively affect coral reef fish behaviour. The study, conducted by an international coalition led by scientists from Australia and Norway, showed that coral reef fish … Continuer la lecture de Ocean acidification a big problem — but not for coral reef fish behavior→
by ‘Guest Blogger’, December 23, 2018 in WUWT Obiter dictum. We acknowledge that seawater is basic and cannot truly acidify (pH<7). But that is a losing semantic quibble, not a winning skeptical argument. The generally accepted linguistic convention—for better or worse–is that lowering seawater pH means ‘acidification’. There is no doubt that adding dissolved CO2 … Continuer la lecture de Ocean Acidification Background Context→
by Cross et al., November 29, 2018 in CO2Science Paper Reviewed Cross, E.L., Harper, E.M. and Peck, L.S. 2018. A 120-year record of resilience to environmental change in brachiopods. Global Change Biology 24: 2262-2271. … In light of all their findings, Cross et al. conclude that “these rhynchonelliform brachiopods have therefore been unaffected in their … Continuer la lecture de A Brachiopod’s Twelve-Decade Response to Ocean Acidification and Warming→
by Prof. Dr. P. Berth, 5 juin 2018, in ScienceClimatEnergie.be Voici quelques réflexions sur la théorie de l’acidification des océans. Selon cette théorie, le pH des océans diminuerait inlassablement, en raison du CO2 qui ne cesse de s’accumuler dans l’atmosphère. • Les mesures directes de pH sont récentes et nous n’avons aucun recul. Selon les … Continuer la lecture de Réflexions sur l’acidification des océans→
by David Middleton, June 5, 2018 in WUWT The Fable of Chicken Little of the Sea Guest essay by David Middleton, When if comes to debunking Gorebal Warming, Chicken Little of the Sea (“ocean acidification”) and other Warmunist myths, my favorite starting points are my old college textbooks. Way back in the Pleistocene (spring semester … Continuer la lecture de The Total Myth of Ocean Acidification→
by K. Richard, May 24, 2018 in NoTricksZone Scientists claim that the ocean’s global mean surface pH may have declined (i.e., became less alkaline and thus more “acidic”) by -0.08 in the last 265 years — from 8.13 during pre-industrial times to 8.05 today. That’s an overall, long-term pH change rate of -0.0003 per year. … Continuer la lecture de 3 More New Papers Expose The Folly Of ‘Ocean Acidification’ Claims→
by Donald et al. 2017, in CO2Science from Géochim.Cosmochim.Acta The influence of pHsw on both pHcf and the calcification rate of Neogoniolithon is plotted in Figure 1 below. As indicated there, this coralline algal species is able to elevate its pHcf so as to increase its rate of calcification under moderate levels of ocean acidification … Continuer la lecture de The Resilience of a Coralline Red Algae to Ocean Acidification→
by Matt Ridley, December 12, 2017 A 2010 analysis of 372 studies of 44 different marine species found that the world’s marine fauna is “more resistant to ocean acidification than suggested by pessimistic predictions” and that it “may not be the widespread problem conjured into the 21st century”
by Winder M. et al., 2017 in Limnology and Oceanography (CO2Science) November 15, 2017 (…) And commenting on this latter finding, they acknowledge that “this is an important component of the biological pump and may contribute to CO2 removal from the atmosphere, mitigating anthropogenic increase in greenhouse gases.”
by McCulloch et al., 2017, October 2017, in co2science Paper Reviewed: McCulloch, M.T., D’Olivo, J.P., Falter, J., Holcomb, M. and Trotter, J.A. 2017. Coral calcification in a changing world and the interactive dynamics of pH and DIC upregulation. Nature Communications 8: 15686, DOI:10.1038/ncomms15686 (…) The implications of the above findings are enormous, for they reveal that “pHcf upregulation occurs largely … Continuer la lecture de The End Of The Ocean Acidification Scare For Corals→
by N.R. Evensen and P.J. Edmunds, 2017, J. Exp. Biology Regardless of the actual mechanism responsible for the densely aggregated corals to maintain calcification rates in the face of ocean acidification, the study of Evensen and Edmunds, in their words, offers “a compelling case for differential densities of branching coral colonies (i.e. aggregation types) mediating … Continuer la lecture de Densely Aggregated Corals Maintain Calcification Under Ocean Acidification Conditions→
by P. Ventura et al., 2016, Writing as background for their work, Ventura et al. (2016) say that “non-calcifying photosynthetic anthozoans have emerged as a group that may thrive under high carbon dioxide partial pressure (pCO2) conditions via increased productivity,” yet they add that “the physiological mechanisms underlying this potential success are unclear.”
Usbek, 13 avril 2017 L’acidification n’est pas une simple réponse statique à l’augmentation de la concentration de CO2 dans l’atmosphère : c’est la résultante de processus biologiques et physico-chimiques qui entraînent une répartition inégale du carbone sur la verticale de l’océan. D’autre part la vie océanique a survécu à des niveaux beaucoup plus élevés de … Continuer la lecture de L’acidification des océans : causes anthropiques versus variabililité naturelle→
by J. Steele, Feb 24, 2024 in WUWT Coral build reefs by producing limestone, or calcium carbonate. The great diversity of shell building mollusks, like clams and oysters, also build their shells out of calcium carbonate. So, scientists assumed that these organisms just pulled carbonate ions from the surrounding sea water and joined it with … Continuer la lecture de Why Climate Scientists were Duped into Believing Rising CO2 will Harm Coral and Mollusks→
La géologie, une science plus que passionnante … et diverse
