a news stream provided by the Ocean Acidification International Coordination Center (OA-ICC)
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‘Acid rain’ changes the chemistry of soils and waters, causes damage to materials, and threatens wildlife and human health. Most important anthropogenic sources of acidifying compounds emitted to the air are fuel combustion and agriculture. Sulfur dioxide and nitrogen oxides in the atmosphere act as strong acids increasing the natural acidity of rainwater. Ammonia emissions […] The post…
Aquatic acidification is a global change phenomenon driven by ever increasing anthropogenic carbon dioxide (CO2) emissions. This drives changes to the carbonate chemistry equilibrium in natural water, resulting in an increase in acidity, which has been shown to influence aquatic organisms. There is substantial evidence that acidification has consequences on marine, coastal, and freshwater…
Foraminifera inhabit coastal and deep-sea marine environments. These microscopic, single-celled organisms are widely used as proxies for relative age determination and reconstructing past climates. The ratio of calcium isotopes (44Ca/40Ca) in their calcium carbonate shells depends on the amount of carbon dioxide (CO2) and carbonate saturation in seawater at the time of the shells’ formation. […]…
Accurate measurement of pH in underwater environments is essential for oceanographic research, environmental monitoring and subsurface exploration. However, conventional electrode-based sensors are limited by drift, corrosion and narrow operational ranges, particularly under extreme pH and high-salinity conditions. Here we present a fibre-optic surface-enhanced Raman scattering platform that…
Ancient ocean acidification triggered one of the ocean’s most severe extinctions New research examining hundreds of microscope fossils offers one of the clearest examples yet of how rising CO2 can alter ocean chemistry and harm marine life. Above, Jonathan Chen, the study’s lead author, uses a fine-tipped brush to separate tiny fossils from surrounding sediment. […] The post Tiny fossils crack a…
Editor’s summary About three quarters of planktic foraminifera species disappeared in the Aptian-Albian extinction event. What role might ocean acidification (OA) have played in this die-out? Chen et al. measured calcium isotope ratios in foraminifera, using them as a proxy for biocalcification and carbonate saturation (see the Perspective by Leckie). Their data reveal a dramatic reduction […] The…
Nitrous oxide (N2O) is a potent and long-lived greenhouse gas, and the ocean represents its primary natural source. An accurate understanding of the emission intensity and driving mechanisms of oceanic N2O directly affects the estimation of atmospheric N2O budget and the projection of climate change. Recent studies have demonstrated that ammonia-oxidizing archaea (AOA) dominate nitrification […]…
Reference number PAR 2026/628 The University of Gothenburg tackles society’s challenges with diverse knowledge. 58 000 students and 6800 employees make the university a large and inspiring place to work and study. Strong research and attractive study programmes attract researchers and students from around the world. With new knowledge and new perspectives, the University contributes to […] The…
Phytoplankton and microzooplankton (MZP) are key components of marine food webs, driving carbon transfer through the microbial loop. Short-term laboratory microcosm bottle incubations using seawater from the Bay of Bengal (BoB) and Arabian Sea (AS) in 2022 examined the effects of reduced pH. Phytoplankton biomass (Chl-a) remained stable or increased by up to 12% under […] The post Short-term pH…
table isotopes are fundamental proxies for deciphering past environmental conditions and carbon cycle perturbations. However, applying these geochemical tools with a forward-looking perspective can also help predict the resilience of marine biota in future acidified oceans. This study investigates carbon uptake and biomineralization pathways under reduced pH in two ecologically keystone calcifying…
The automated station, resulting from a participatory budgeting process and an agreement with the Barcelona City Council, records currents, pH, temperature, and real-time meteorological data off this iconic Barcelona beach. The buoy has been moored approximately 1.5 kilometres from the coastline / ICATMAR. The Institute of Marine Sciences (ICM-CSIC), in collaboration with the Catalan Research […]…
Choose Your Own (O)Adventure brings an interactive experience for your own learning pathway. The NOAA Ocean Acidification Program is excited to announce the launch of “Choose Your Own (O)Adventure,” a new interactive tool to help you discover ocean and coastal acidification resources tailored to your specific interests and goals. Skip the search for quality ocean […] The post Choose Your Own…
Although net negative emissions of carbon dioxide (CO2) are essential to meet climate targets, little is known about how declining atmospheric CO2 levels will affect ocean acidification. Here, by analysing the acidity ([H+]) and corrosivity to aragonite (ΩArag) in eight Earth system models that made simulations under rising then falling CO2 levels, we identify the Arctic as […] The post…
Seawater pH measurement is essential for monitoring ocean acidification and its biogeochemical impacts. Glass electrode pH sensors are widely used for in situ applications due to their ease of operation, low power consumption, and no reagent requirements. However, their accuracy can be affected by temperature-dependent effects, particularly those associated with the internal reference solution.…
