"Ocean acidity" refers to the level of acid in the seawater. It measures how acidic or basic the ocean is.
Full definition
This chemical effect has long been known, and increases
in ocean acidity have been well publicized recently.
In addition, the CO2 emitted by human activities has caused an increase
of ocean acidity, with poorly understood but potentially important negative impacts.
Scientists are only beginning to do the research on how individual species of organisms might respond to increasing levels of
ocean acidity as atmospheric levels of CO2 continue to rise.
In particular,
if ocean acidity were a problem for shell formation, it would have shown up already in areas where there are naturally high levels of CO2.
How will species adapt to the swift spike
in ocean acidity that humans are causing?
The rate of change
of ocean acidity is many times faster than anything experienced in the last 55 million years.
«This indicates that future changes in
ocean acidity caused by atmospheric carbon - dioxide concentrations are largely independent of climate change.»
This would represent a 150 percent increase in
ocean acidity since the beginning of the Industrial Revolution.
A new process to decompose waste desalination brine using solar energy, which
neutralises ocean acidity and reduces environmental impact, has been proposed by an Aston University (UK) academic.
A new paper tests how increasing
ocean acidity affects coral growth in the natural environment, where a multitude of additional factors such as light, temperature, and nutrients are important.
There's no satellite in space that's capable of directly
measuring ocean acidity, but an international team of scientists writing in the journal Environmental Science & Technology described last week how satellite measurements of sea surface temperatures, salinity and plankton activity could be combined and used to estimate pH.
Fish are known to absorb calcium from seawater, binding it to carbon and excreting it as a carbonate molecule that can form a weak base capable of
neutralizing ocean acidity.
NEPTUNE researchers are in the midst of designing an efficient pH meter that, coupled with data from cameras and other sensors, will
monitor ocean acidity and detect any effects.
In the past, factors
like ocean acidity, temperature, and oxygen concentration may have more greatly influenced a marine organism's likelihood of surviving, Payne explained, and tolerance to such factors is not strongly associated with body size.
Computer models
peg ocean acidity at 7.8 to 7.7 by the end of the century at the current rate of greenhouse gas emissions.
Montana — based Sunburst Sensors will help scientists monitor rise in
ocean acidity more widely and precisely
Also, Shi and collaborators demonstrated that rising CO2 alone can stimulate the microbes» growth but that the watery slide
toward ocean acidity can depress the microbes» ability to fix nitrogen.
The goal of this X PRIZE, according to Bunje, is to
turn ocean acidity readings into valuable and ubiquitous information as is the case with temperature data, and he hopes to inspire research spending well in excess of the prize money put up.
One of the most critical effects of increasing
ocean acidity relates to the production of shells, skeletons, and plates from calcium carbonate, a process known as calcification.
Combined with Integrated Ocean Observing System (IOOS) buoys from NOAA measuring wind velocity, they
track ocean acidity — and predict the upwelling events that cause increased acidity — in real time.
Doug Wise in # 331 and I in # 159 commented that because the
Southern Ocean acidity tipping point is likely to be reached at 450 ppm CO2, at which point a major global carbon sink begins to be affected, that concentration targets still remain important.
Rising temperatures in conjunction with
heightened ocean acidity (a consequence of rising C02 levels) weakens the symbiotic partners of coral - the algae that help make reefs strong and give corals their vibrant colors - in what some scientists call a doomsday «double whammy.»
Measurements of increased
ocean acidity give us little additional information about the sources of CO2 increases.
In 2014, NOAA News promoted another paper by Bednarsek about dissolving sea butterfly shells with the headlines, «NOAA - Led Researchers
Discover Ocean Acidity Is Dissolving Shells Of Tiny Snails Off The U.S. West Coast.»
Increasing
ocean acidity due to increasing atmospheric concentrations of CO2 (Denman et al., 2007 Section 7.3.4.1; Sabine et al., 2004; Royal Society, 2005) is very likely to reduce biocalcification of marine organisms such as corals (Hughes et al., 2003; Feely et al., 2004).
The project will result in two thirds of a million tonnes less carbon dioxide going into the atmosphere each year, slowing climate and
ocean acidity damage;
Time - series and survey measurements [4 — 6] over the past 20 years have shown that surface ocean pH has reduced by 0.1 pH unit relative to pre-industrial levels, equating to a 26 % increase in ocean acidity [3].
Warming seas and increased
ocean acidity weakens corals and reduces their ability to withstand other threats.
Or how about how human emissions of carbon dioxide have «
raised ocean acidity far beyond the range of natural variations»
This newest threat follows on the heels of overfishing, sediment deposition, nitrate pollution in some areas, coral bleaching caused by global warming, and increasing
ocean acidity caused by carbon emissions.
Dr Philip Davies, of Aston's School of Engineering and Applied Science, has devised a system using solar energy that could allow desalination plants to act as a sink, rather than a source of atmospheric carbon dioxide, and help to
neutralise ocean acidity.
«Before our study, there was speculation in the academic community that climate change would have a big impact
on ocean acidity,» Jain said.
A new report urges that federal efforts to combat
rising ocean acidity must focus on effects on people and the economy
Rising CO2 emissions, and the increasing acidity of seawater over the next century, has the potential to devastate some marine ecosystems, a food resource on which we rely, and so careful monitoring of changes
in ocean acidity is crucial.
Phrases with «ocean acidity»