Ocean acidification

Witness to ocean acidification

Carolina Galdino — Thu, 20 Aug 2026 12:00:00 +0000

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. […]

The post Witness to ocean acidification appeared first on Ocean Acidification.

Field-deployable full-range underwater pH sensor using a polyprotic SERS probe

Carolina Galdino — Thu, 20 Aug 2026 11:59:00 +0000

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 enables full-range (pH 0–14) underwater pH sensing using […]

The post Field-deployable full-range underwater pH sensor using a polyprotic SERS probe appeared first on Ocean Acidification.

Tiny fossils crack a cretaceous cold case

Carolina Galdino — Wed, 19 Aug 2026 12:00:00 +0000

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 cretaceous cold case appeared first on Ocean Acidification.

Calcium isotopes link ocean acidification to Aptian–Albian foraminiferal extinctions

Carolina Galdino — Wed, 19 Aug 2026 11:59:00 +0000

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 post Calcium isotopes link ocean acidification to Aptian–Albian foraminiferal extinctions appeared first on Ocean Acidification.

A hidden driver of the greenhouse effect: production mechanisms and climate implications of N2O derived from marine planktonic ammonia-oxidizing archaea

Carolina Galdino — Tue, 18 Aug 2026 12:00:00 +0000

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 […]

The post A hidden driver of the greenhouse effect: production mechanisms and climate implications of N2O derived from marine planktonic ammonia-oxidizing archaea appeared first on Ocean Acidification.

Postdoctor in Experimental evaluation of the combined effects of changes associated with ocean alkalinity enhancement (OAE) implementation

Lina Hansson — Mon, 17 Aug 2026 15:41:24 +0000

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 post Postdoctor in Experimental evaluation of the combined effects of changes associated with ocean alkalinity enhancement (OAE) implementation appeared first on Ocean Acidification.

Short-term pH variability reshapes phytoplankton and microzooplankton communities in the northern Indian Ocean

Carolina Galdino — Mon, 17 Aug 2026 12:00:00 +0000

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 variability reshapes phytoplankton and microzooplankton communities in the northern Indian Ocean appeared first on Ocean Acidification.

Biological modulation of shell δ13C in Mytilus galloprovincialis and Phorcus sp.: divergent responses between CO2 vents and laboratory mesocosms

Carolina Galdino — Mon, 17 Aug 2026 11:59:00 +0000

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 species: the bivalve Mytilus […]

The post Biological modulation of shell δ13C in Mytilus galloprovincialis and Phorcus sp.: divergent responses between CO2 vents and laboratory mesocosms appeared first on Ocean Acidification.

ICM and ICATMAR deploy an oceanographic buoy off Somorrostro beach to monitor ocean acidification

Carolina Galdino — Mon, 17 Aug 2026 11:58:00 +0000

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 […]

The post ICM and ICATMAR deploy an oceanographic buoy off Somorrostro beach to monitor ocean acidification appeared first on Ocean Acidification.

Choose Your Own (O)Adventure education tool released

Carolina Galdino — Mon, 17 Aug 2026 11:57:00 +0000

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 (O)Adventure education tool released appeared first on Ocean Acidification.