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Blog Profile / Ocean Acidification

Filed Under:Biology / Marine Biology
Posts on Regator:4960
Posts / Week:21.1
Archived Since:July 23, 2010

Blog Post Archive

Glacial melt could change chemistry and food web in world’s oceans

Along with increasing sea levels, melting glaciers are putting something else into the world’s oceans — a huge load of organic carbon that has the potential to change marine chemistry and ecosystems, says a newly published study by a team of mostly Alaska scientists. (…) The accelerated melt of glaciers gets attention because of its […]

Oceans face higher acidity levels as more man-made CO2 gets absorbed

Just about 5 million tons of carbon dioxide (CO2) is dumped into the atmosphere every hour from the burning of fossil fuels mostly for transportation, electrical generation, industry and heating. This is the fastest rate of CO2 generation that the earth has experienced in millions of years. It’s been estimated that about a quarter of […]

Experts: include ocean acidification in climate change negotiations

Monaco – Actions to mitigate and adapt to ocean acidification in a future global climate deal could make the agreement stronger and facilitate its implementation. That was one of the conclusions from last week’s international workshop on ocean acidification organised by the IAEA in Monaco. Scientists aren’t alone in raising the threat from ocean acidification; […]

Acid in seas and mudflats threatens to wipe out local shellfish populations

56 million years ago, a massive release of carbon dioxide into the atmosphere and oceans caused a monumental shift in the climate, increasing the earth’s surface temperature by 11 degrees. Meanwhile, a rapid chemical change in the ocean occurred as the gas and water formed carbonic acid, eventually causing the extinction of all of the […]

Seasonality of sea ice controls interannual variability of summertime ?A at the ice shelf in the Eastern Weddell Sea – an ocean acidification sensitivity study

Increasing anthropogenic CO2 is decreasing surface water aragonite saturation state (?A), a growing concern for calcifying Euthecosome pteropods and its wider impact on Antarctic ecosystems. However, our understanding of the seasonal cycle and interannual variability of this vulnerable ecosystem remains limited. Show More Summary

Special chambers simulate ocean acidification in Antarctica (text & audio)

BRENDAN TREMBATH: Scientists from the Australian Antarctic Division have built special underwater chambers to test what will happen when the ocean becomes more acidic. Increases in carbon dioxide in the atmosphere are absorbed by the ocean, making sea water more acidic. The experiment being conducted under the sea ice at Casey station this summer is […]

L’acidification des océans en question à Monaco (video, in French)

C’est à Monaco en 2009 qu’une déclaration a tout d’abord alerté sur ce phénomène inquiétant : l’acidification des océans. S.A.S. le Prince Albert II a présidé cette conférence au Musée Océanographique, réunissant de nombreux participants venus du monde entier. Tous ont échangé pour trouver des solutions afin d’améliorer la situation des populations côtières, de la […]

Changing ocean chemistry imperils ecosystem (video)

Fisheries in Peruvian Pacific struggle to keep up with demand amid rising sea temperatures and ocean acidification. More than one billion people in the world rely on food harvested from the ocean. But global fisheries – already stretched by overfishing – are now threatened by rising sea temperatures and ocean acidification. Al Jazeera’s Nick Clark […]

Strategies to thwart ocean acidification

Taylor Shellfish in Washington state is circumventing the effects of ocean acidification – thanks in part to expanded hatchery facilities in Hawaii; units for juveniles at a de-commissioned pulp and paper mill in Humboldt Bay, California; and state officials who are paying attention. Company spokesperson Bill Dewey told HI that Taylor Shellfish now has three […]

A metadata template for ocean acidification data

This paper defines the best practices for documenting ocean acidification (OA) metadata and presents a framework for an OA metadata template. Metadata is structured information that describes and locates an information resource. It is the key to ensuring that a data set will survive and continue to be accessible into the future. With the rapid […]

Response to pH stress in the reef-building coral Pocillopora capitata (Anthozoa: Scleractinia)

To evaluate the metabolic response of the symbiotic coral Pocillopora capitata to reduced seawater pH in an in vitro system, 112 branches of P. capitata with no apparent damage from bleaching were collected from the La Boquita (LB) coral community. Two pH treatments were evaluated: a) pH 7.85/7.95 (Treatment C1), b) 7.60/7.70 (Treatment C2), and […]

Calcification is not the Achilles’ heel of cold-water corals in an acidifying ocean

Ocean acidification is thought to be a major threat to coral reefs: laboratory evidence and CO2 seep research has shown adverse effects on many coral species, although a few are resilient. There are concerns that cold-water corals are even more vulnerable as they live in areas where aragonite saturation (?ara) is lower than in the […]

Calcareous green alga Halimeda tolerates ocean acidification conditions at tropical carbon dioxide seeps

We investigated ecological, physiological, and skeletal characteristics of the calcifying green alga Halimeda grown at CO2 seeps (pHtotal ? 7.8) and compared them to those at control reefs with ambient CO2 conditions (pHtotal ? 8.1). Six species of Halimeda were recorded at both the high CO2 and control sites. For the two most abundant species […]

Solar thermal decomposition of desalination reject brine for carbon dioxide removal and neutralisation of ocean acidity

Desalination plants could become net absorbers (rather than net emitters) of CO2. Thermal decomposition of salts in desalination reject brine can yield MgO which, added to the ocean, would take up CO2 through conversion to bicarbonate. The process proposed here comprises dewatering of brine followed by decomposition in a solar receiver using a heliostat field. […]

WESTPAC Training Workshop on Research and Monitoring of the Ecological Impacts of Ocean Acidification on Coral Reef Ecosystems, Phuket, Thailand, 19-21 January 2015

The IOC Sub-Commission for the Western Pacific (WESTPAC) aims to establish regional research and monitoring network on ocean acidification in the Western Pacific and its adjacent regions, and develop a regional program, as one regional...Show More Summary

3rd edition of the “Ocean Acidification Report”

Global Ocean Health (GOH) has recently released the third edition of its “Ocean Acidification Report”. Some of the topics covered include the decisions of the Maine Ocean Acidification Commission on the normative approach to OA in the state and local vulnerabilities in fisheries, new funding oppotunities for OA research in the USA  and the very […]

Coral host cells acidify symbiotic algal microenvironment to promote photosynthesis

Symbiotic dinoflagellate algae residing inside coral tissues supply the host with the majority of their energy requirements through the translocation of photosynthetically fixed carbon. The algae, in turn, rely on the host for the supply of inorganic carbon. Carbon must be concentrated as CO2 in order for photosynthesis to proceed, and here we show that […]

Emissions anthropiques de CO2 et acidification de l’océan (video, in French) Jean-Pierre Gattuso, Directeur de recherche au CNRS, Laboratoire d’Océanographie de Villefranche-sur-Mer, parle de l’acidification des océan dans le cadre de la conférence-débat de l’Académie...Show More Summary

UNFCCC COP20: Informal UK report with focus on ocean acidification and the involvement of the international OA research community

The 20th Conference of Parties of the UN Framework Convention on Climate Change was held in Lima, Peru from 1st to 12th December 2014. Between 15 and 20,000 governmental, intergovernmental and non-governmental delegates from 195 countries attended. Show More Summary

As waters acidify, Maine looks to Pacific Northwest peers for help

WALPOLE, Maine In the icy waters of midcoast Maine, Bill Mook has his eyes on his oysters – and how the waters they need to survive are gradually, but clearly, changing. Down the coast near Portland, the issue is clams and the mud flats that have become inhospitable to their survival. Farther south still, near […]

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