The potential of coastal ocean alkalinization (COA), a carbon dioxide removal (CDR) climate engineering strategy that chemically
increases ocean carbon uptake and storage, is investigated with an Earth system model of intermediate complexity.
Anyone who insists otherwise (that it comes from the ocean — despite the isotopic evidence, budget and direct measurements of
increasing ocean carbon) is living in cloud - cuckoo land.
Today, as we pump more CO2 into the atmosphere, slightly more flows from the atmosphere into the ocean, leaving enough to increase the atmospheric CO2 concentration, and
increasing the oceans carbon content.
The difficulty arises from the inhomogeneity of ocean carbon and from the fact that anthropogenic carbon has
increased ocean carbon by only 1 - 2 %, even while it is has increased atmospheric carbon by about 38 %.
Not exact matches
Increased ocean acidification caused by the absorption of
carbon dioxide causes bleaching, too.
The new report «Lights Out for the Reef», written by University of Queensland coral reef biologist Selina Ward, noted that reefs were vulnerable to several different effects of climate change; including rising sea temperatures and
increased carbon dioxide in the
ocean, which causes acidification.
He added that scientists need to monitor
carbon storage and possible temperature
increases in
oceans at depths greater than 2 kilometers in addition to adding biogeochemical sensing capacity.
The chemistry of the
ocean is also affected, as the
increased concentrations of atmospheric
carbon dioxide will cause the
ocean to become more acidic.
«The results show unequivocally that most of the
increase in CO2 between 7000 and 500 years ago is due to release of
carbon from the
ocean, not to axe - wielding humans,» says Eric Steig, an isotope geochemist at the University of Washington in Seattle.
Ocean acidification, which is a direct consequence of
increased atmospheric
carbon dioxide levels, is expected to have a deleterious effect on many marine species over the next century.
The
carbon they produce when building their chalk plates even helps buffer the
increasing acidity in the
ocean caused by excess
carbon dioxide in the atmosphere.
Although some lakes can also absorb CO2 at their surfaces similar to the way
oceans do, the
increases in these other sources of organic and inorganic
carbon are likely the dominant factor, says Scott Higgins, a research scientist at the International Institute for Sustainable Development's Experimental Lakes Area, a natural laboratory of 58 small lakes in Ontario.
As the climate changes, Southern
Ocean upwelling may increase, which could accelerate ice shelf melting, release more carbon into the atmosphere and limit the ocean's ability to absorb heat and carbon dioxide from the atmosp
Ocean upwelling may
increase, which could accelerate ice shelf melting, release more
carbon into the atmosphere and limit the
ocean's ability to absorb heat and carbon dioxide from the atmosp
ocean's ability to absorb heat and
carbon dioxide from the atmosphere.
First, geochemical evidence shows an exponential (or even faster)
increase of
carbon dioxide in the
oceans at the time of the so - called end - Permian extinction.
«To put this in some kind of context, if those small scale eddies did not
increase with wind stress then the saturation of
carbon dioxide in the Southern
Ocean sink would occur twice as rapidly and more heat would enter our atmosphere and sooner.»
Antarctica was also more sensitive to global
carbon dioxide levels, Cuffey said, which
increased as the global temperature
increased because of changing
ocean currents that caused upwelling of
carbon - dioxide - rich waters from the depths of the
ocean.
The ability of the
oceans to take up
carbon dioxide can not keep up with the rising levels of greenhouse gases in the atmosphere, which means
carbon dioxide and global temperatures will continue to
increase unless humans cut their
carbon dioxide emissions.
«If the winds continue to
increase as a result of global warming, then we will continue to see
increased energy in eddies and jets that will have significant implications for the ability of the Southern
Ocean to store
carbon dioxide and heat,» said Dr Hogg.
What happens when the world moves into a warm, interglacial period isn't certain, but in 2009, a paper published in Science by researchers found that upwelling in the Southern
Ocean increased as the last ice age waned, correlated to a rapid rise in atmospheric
carbon dioxide.
As atmospheric
carbon dioxide
increases, the greenhouse gas is absorbed into
ocean water, making it more acidic.
It may takes tens of thousands of years for
oceans to recover from the acidity caused by
increased levels of
carbon dioxide
Studies on coral, mollusks, and other
ocean denizens are helping to paint a picture of what the future might entail for specific species, should
carbon emissions continue to
increase.
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.
Sydney researcher Ian Jones attracted a lot of interest with his innovative scheme to
increase the capacity of the
ocean to absorb
carbon dioxide.
«
Ocean warming to cancel
increased carbon dioxide - driven productivity.»
Other factors come into play:
Increasing carbon dioxide emissions worldwide are making all
oceans more acidic, forcing species to use more energy to adapt, leaving them with less energy to reproduce and grow.
This balance is threatened by
increasing atmospheric
carbon dioxide, which causes
ocean acidification (decreasing
ocean pH).
When temperatures are low, the
ocean dissolves an
increasing amount of
carbon dioxide, a potent greenhouse gas, further reducing the planet's temperature.
But much of it takes place in
oceans, which are susceptible to the
increasing amounts of
carbon dioxide human activity releases into the atmosphere.
Dr. Houghton and colleagues conclude that the greater certainty in atmospheric
carbon measurements has led to an
increased certainty in the calculated rate of
carbon uptake by land and
oceans.
The world's
oceans are expected to become more acidic as human activities pump
increasing amounts of
carbon dioxide into Earth's atmosphere.
While these results indicate that coccolithophore calcification might
increase under future
ocean conditions, the researchers say that it's still unclear «whether, or how, such changes might affect
carbon export to the deep sea.»
Ultimately, the group focused its investigation on the five strategies that appear to hold the most promise: reducing emissions, sequestering
carbon through biological means on land and in the
ocean, storing
carbon dioxide in a liquefied form in underground geological formations and wells,
increasing Earth's cloud cover and solar reflection.
As the
ocean mass moves north, it absorbs additional
carbon dioxide from decomposing organic matter in the water and sediments,
increasing acidity.
«This work will help
increase our understanding of climate change,
carbon cycling, and
ocean acidification in the Arctic, particularly as it affects marine and fishery science and technology,» added Chen.
When
carbon dioxide, CO2, from the atmosphere is absorbed by the
ocean, it forms carbonic acid (the same thing that makes soda fizz), making the
ocean more acidic and decreasing the
ocean's pH. This
increase in acidity makes it more difficult for many marine organisms to grow their shells and skeletons, and threatens coral reefs the world over.
As growing
carbon dioxide gas emissions have dissolved into the world's
oceans, the average acidity of the waters has
increased by 30 % since 1750.
Climate modeling shows that the trends of warming
ocean temperatures, stronger winds and increasingly strong upwelling events are expected to continue in the coming years as
carbon dioxide concentrations in the atmosphere
increase.
Here, the
ocean -
carbon sink has
increased, absorbing more
carbon dioxide.
The authors said the study underlines the
increasing vulnerability of calcified animals to
ocean acidification, which occurs as the
ocean absorbs more atmospheric
carbon emitted through the burning of fossil fuels.
The model also accounted for natural drivers of change, including the direct influence of
increased carbon dioxide on
ocean -
carbon uptake and the indirect effect that a changing climate has on the physical state of the
ocean and its relationship to atmospheric
carbon dioxide.
Study co-author Katy Sheen, a Postdoctoral Research Fellow from
Ocean and Earth Science at the University of Southampton, says: «These findings will help us to understand the processes that drive the ocean circulation and mixing so that we can better predict how our Earth system will respond to the increased levels of carbon dioxide that we have released into the atmosphere.&r
Ocean and Earth Science at the University of Southampton, says: «These findings will help us to understand the processes that drive the
ocean circulation and mixing so that we can better predict how our Earth system will respond to the increased levels of carbon dioxide that we have released into the atmosphere.&r
ocean circulation and mixing so that we can better predict how our Earth system will respond to the
increased levels of
carbon dioxide that we have released into the atmosphere.»
As the
oceans absorb
increasing amounts of
carbon dioxide from the atmosphere,
ocean acidification is expected to make life harder for many marine organisms, especially shellfish and other animals with shells or skeletons made of calcium carbonate.
For example, the new study notes that restoring whale populations could help
increase the
ocean's capacity to absorb climate - warming
carbon dioxide.
As atmospheric CO2 levels
increase from burning fossil fuels, this
carbon dioxide is soaked up by seawater and makes the
oceans more acidic.
The uptake of fossil fuel
carbon dioxide (CO2) by the
ocean increases seawater acidity and causes a decline in carbonate ion concentrations.
Warming temperatures can thaw permafrost, liberating more material into the
ocean, and
increasing river and groundwater runoff can carry more radium, nutrients,
carbon, and other material into the Arctic.
High temperatures
increase weathering of silicate rocks, and this sucks
carbon dioxide out of the atmosphere and into the
oceans — a process aided by plants.
The analysis revealed that, while the amount of
carbon dioxide in the open
ocean is
increasing at the same rate as in the atmosphere, these same
carbon dioxide concentrations are
increasing slower in the coastal
ocean.
But it would have been nice to hear the authors» thoughts on recent Japanese proposals to attempt to bioengineer even more productive living coral reefs and plant them in the Pacific to
increase the power of the
oceans to absorb
carbon.