This article will be permanently flagged as inappropriate and made unaccessible to everyone. Are you certain this article is inappropriate? Excessive Violence Sexual Content Political / Social
Email Address:
Article Id: WHEBN0002801560 Reproduction Date:
Ocean acidification is the ongoing decrease in the pH of the Earth's oceans, caused by the uptake of carbon dioxide (CO2) from the atmosphere.[2] An estimated 30–40% of the carbon dioxide from human activity released into the atmosphere dissolves into oceans, rivers and lakes.[3][4] To achieve chemical equilibrium, some of it reacts with the water to form carbonic acid. Some of these extra carbonic acid molecules react with a water molecule to give a bicarbonate ion and a hydronium ion, thus increasing ocean acidity (H+ ion concentration). Between 1751 and 1994 surface ocean pH is estimated to have decreased from approximately 8.25 to 8.14,[5] representing an increase of almost 30% in H+ ion concentration in the world's oceans.[6][7] Earth System Models project that within the last decade ocean acidity exceeded historical analogs[8] and in combination with other ocean biogeochemical changes could undermine the functioning of marine ecosystems and disrupt the provision of many goods and services associated with the ocean.[9]
Increasing acidity is thought to have a range of possibly harmful consequences, such as depressing metabolic rates and immune responses in some organisms, and causing coral bleaching. This also causes decreasing oxygen levels as it kills off algae.
Other chemical reactions are triggered which result in a net decrease in the amount of coral and some plankton, to form biogenic calcium carbonate, and such structures become vulnerable to dissolution.[10] Ongoing acidification of the oceans threatens food chains connected with the oceans.[11][12] As members of the InterAcademy Panel, 105 science academies have issued a statement on ocean acidification recommending that by 2050, global CO2 emissions be reduced by at least 50% compared to the 1990 level.[13]
Ocean acidification has been called the "evil twin of global warming"[14][15][16][17][18] and "the other CO2 problem".[15][17][19]
Ocean acidification has occurred previously in Earth's history. The most notable example is the Paleocene-Eocene Thermal Maximum (PETM),[20] which occurred approximately 56 million years ago. For reasons that are currently uncertain, massive amounts of carbon entered the ocean and atmosphere, and led to the dissolution of carbonate sediments in all ocean basins.
The carbon cycle describes the fluxes of carbon dioxide (CO 2) between the oceans, terrestrial biosphere, lithosphere,[21] and the atmosphere. Human activities such as the combustion of fossil fuels and land use changes have led to a new flux of CO 2 into the atmosphere. About 45% has remained in the atmosphere; most of the rest has been taken up by the oceans,[22] with some taken up by terrestrial plants.[23]
The carbon cycle involves both
The following packages calculate the state of the carbonate system in seawater (including pH):
Videos on Ocean Acidification:
Popular media sources:
Government sources:
Scientific projects:
Educational sites:
Scientific sources:
"Present day" (1990s) sea surface pH
Present day alkalinity
"Present day" (1990s) sea surface anthropogenic CO 2
Vertical inventory of "present day" (1990s) anthropogenic CO 2
Change in surface CO2− 3 ion from the 1700s to the 1990s
Present day DIC
Pre-Industrial DIC
A NOAA (AOML) in situ CO 2 concentration sensor (SAMI-CO2), attached to a Coral Reef Early Warning System station, utilized in conducting ocean acidification studies near coral reef areas
A NOAA (PMEL) moored autonomous CO 2 buoy used for measuring CO 2 concentration and ocean acidification studies
[114]. 2CO
A report by the UK's Royal Society (2009)[110] reviewed the approach for effectiveness, affordability, timeliness and safety. The rating for affordability was "medium", or "not expected to be very cost-effective." For the other three criteria, the ratings ranged from "low" to "very low" (i.e., not good). For example, in regards to safety, the report found a "[high] potential for undesirable ecological side effects," and that ocean fertilization "may increase anoxic regions of ocean ('dead zones')."[111]
Iron fertilization of the ocean could stimulate photosynthesis in phytoplankton (see Iron Hypothesis). The phytoplankton would convert the ocean's dissolved carbon dioxide into carbohydrate and oxygen gas, some of which would sink into the deeper ocean before oxidizing. More than a dozen open-sea experiments confirmed that adding iron to the ocean increases photosynthesis in phytoplankton by up to 30 times.[108] While this approach has been proposed as a potential solution to the ocean acidification problem, mitigation of surface ocean acidification might increase acidification in the less-inhabited deep ocean.[109]
Reports by the WGBU (2006),[102] the UK's Royal Society (2009),[106] and the US National Research Council (2011)[107] warned of the potential risks and difficulties associated with climate engineering.
Mitigation approaches such as adding chemicals to counter the effects of acidification are likely to be expensive, only partly effective and only at a very local scale, and may pose additional unanticipated risks to the marine environment. There has been very little research on the feasibility and impacts of these approaches. Substantial research is needed before these techniques could be applied.
(mitigating temperature or pH effects of emissions) has been proposed as a possible response to ocean acidification. The IAP (2009)[13] statement cautioned against climate engineering as a policy response:
Limiting global warming to below 2 °C would imply a reduction in surface ocean pH of 0.16 from pre-industrial levels. This would represent a substantial decline in surface ocean pH.[105]
One policy target related to ocean acidity is the magnitude of future global warming. Parties to the United Nations Framework Convention on Climate Change (UNFCCC) adopted a target of limiting warming to below 2 °C, relative to the pre-industrial level.[103] Meeting this target would require substantial reductions in anthropogenic CO2 emissions.[104]
In order to prevent disruption of the calcification of marine organisms and the resultant risk of fundamentally altering marine food webs, the following guard rail should be obeyed: the pH of near surface waters should not drop more than 0.2 units below the pre-industrial average value in any larger ocean region (nor in the global mean).
The German Advisory Council on Global Change[102] stated:
Stabilizing atmospheric CO2 concentrations at 450 ppm would require near-term emissions reductions, with steeper reductions over time.[101]
Acknowledge that ocean acidification is a direct and real consequence of increasing atmospheric CO2 concentrations, is already having an effect at current concentrations, and is likely to cause grave harm to important marine ecosystems as CO2 concentrations reach 450 [parts-per-million (ppm)] and above; [...] Recognise that reducing the build up of CO2 in the atmosphere is the only practicable solution to mitigating ocean acidification; [...] Reinvigorate action to reduce stressors, such as overfishing and pollution, on marine ecosystems to increase resilience to ocean acidification.
Members of the InterAcademy Panel recommended that by 2050, global anthropogenic CO2 emissions be reduced less than 50% of the 1990 level.[13] The 2009[13] statement also called on world leaders to:
Acidification could damage the Arctic tourism economy and affect the way of life of indigenous peoples. A major pillar of Arctic tourism is the sport fishing and hunting industry. The sport fishing industry is threatened by collapsing food webs which provide food for the prized fish. A decline in tourism lowers revenue input in the area, and threatens the economies that are increasingly dependent on tourism.[99] Acidification is not merely a threat but has significantly declined whole fish populations. For example, In Scandinavia studies conducted on acidic water revealed that 15% of species populations had disappeared and that many more populations were limited in numbers or declining.[100] The rapid decrease or disappearance of marine life could also affect the diet of Indigenous peoples.
The threat of acidification includes a decline in American Lobster, Ocean Quahog, and scallops means there is less shellfish meat available for sale and consumption.[96] Red king crab fisheries are also at a serious threat because crabs are calcifiers and rely on carbonate ions for shell development. Baby red king crab when exposed to increased acidification levels experienced 100% mortality after 95 days.[97] In 2006 Red King Cab accounted for 23% of the total guideline harvest levels and a serious decline in red crab population would threaten the crab harvesting industry.[98] Several ocean goods and services are likely to be undermined by future ocean acidification potentially affecting the livelihoods of some 400 to 800 million people depending upon the emission scenario.[9]
Leaving aside direct biological effects, it is expected that ocean acidification in the future will lead to a significant decrease in the burial of carbonate sediments for several centuries, and even the dissolution of existing carbonate sediments.[89] This will cause an elevation of ocean alkalinity, leading to the enhancement of the ocean as a reservoir for CO2 with implications for climate change as more CO2 leaves the atmosphere for the ocean.[90]
Another possible effect would be an increase in anchovies and shellfish, in turn increasing occurrences of amnesic shellfish poisoning, neurotoxic shellfish poisoning and paralytic shellfish poisoning.[88]
Aside from the slowing and/or reversing of calcification, organisms may suffer other adverse effects, either indirectly through negative impacts on food resources,[27] or directly as reproductive or physiological effects. For example, the elevated oceanic levels of CO2 may produce CO 2-induced acidification of body fluids, known as ecosystems.[87]
In some places carbon dioxide bubbles out from the sea floor, locally changing the pH and other aspects of the chemistry of the seawater. Studies of these carbon dioxide seeps have documented a variety of responses by different organisms.[6] Coral reef communities located near carbon dioxide seeps are of particular interest because of the sensitivity of some corals species to acidification. In Papua New Guinea, declining pH caused by carbon dioxide seeps is associated with declines in coral species diversity.[81] However, in Palau carbon dioxide seeps are not associated with reduced species diversity of corals, although bioerosion of coral skeletons is much higher at low pH sites.
Ocean acidification may force some organisms to reallocate resources away from productive endpoints such as growth in order to maintain calcification.[80]
The fluid in the internal compartments where corals grow their exoskeleton is also extremely important for calcification growth. When the saturation rate of aragonite in the external seawater is at ambient levels, the corals will grow their aragonite crystals rapidly in their internal compartments, hence their exoskeleton grows rapidly. If the level of aragonite in the external seawater is lower than the ambient level, the corals have to work harder to maintain the right balance in the internal compartment. When that happens, the process of growing the crystals slows down, and this slows down the rate of how much their exoskeleton is growing. Depending on how much aragonite is in the surrounding water, the corals may even stop growing because the levels of aragonite are too low to pump in to the internal compartment. They could even dissolve faster than they can make the crystals to their skeleton, depending on the aragonite levels in the surrounding water.[79]
When exposed in experiments to pH reduced by 0.2 to 0.4, larvae of a temperate brittlestar, a relative of the common sea star, fewer than 0.1 percent survived more than eight days.[46] There is also a suggestion that a decline in the coccolithophores may have secondary effects on climate, contributing to global warming by decreasing the Earth's albedo via their effects on oceanic cloud cover.[78] All marine ecosystems on Earth will be exposed to changes in acidification and several other ocean biogeochemical changes.[9]
The Royal Society published a comprehensive overview of ocean acidification, and its potential consequences, in June 2005.[27] However, some studies have found different response to ocean acidification, with coccolithophore calcification and photosynthesis both increasing under elevated atmospheric pCO2,[72][73][74] an equal decline in primary production and calcification in response to elevated CO2[75] or the direction of the response varying between species.[76] A study in 2008 examining a sediment core from the North Atlantic found that while the species composition of coccolithophorids has remained unchanged for the industrial period 1780 to 2004, the calcification of coccoliths has increased by up to 40% during the same time.[74] A 2010 study from Stony Brook University suggested that while some areas are overharvested and other fishing grounds are being restored, because of ocean acidification it may be impossible to bring back many previous shellfish populations.[77] While the full ecological consequences of these changes in calcification are still uncertain, it appears likely that many calcifying species will be adversely affected.
Corals,[61][62][63] coccolithophore algae,[64][65][66][67] coralline algae,[68] foraminifera,[69] shellfish[70] and pteropods[10][71] experience reduced calcification or enhanced dissolution when exposed to elevated CO 2.
Although the natural absorption of CO 2 by the world's oceans helps mitigate the climatic effects of anthropogenic emissions of CO 2, it is believed that the resulting decrease in pH will have negative consequences, primarily for oceanic coccolithophores, corals, foraminifera, echinoderms, crustaceans and molluscs.[9][59] As described above, under normal conditions, calcite and aragonite are stable in surface waters since the carbonate ion is at supersaturating concentrations. However, as ocean pH falls, the concentration of carbonate ions required for saturation to occur increases, and when carbonate becomes undersaturated, structures made of calcium carbonate are vulnerable to dissolution. Therefore, even if there is no change in the rate of calcification, the rate of dissolution of calcareous material increases.[60]
The report "Ocean Acidification Summary for Policymakers 2013" describes research findings and possible impacts.[58]
Increasing acidity has possibly harmful consequences, such as depressing metabolic rates in jumbo squid,[54] depressing the immune responses of blue mussels,[55] and coral bleaching. However it may benefit some species, for example increasing the growth rate of the sea star, Pisaster ochraceus,[56] while shelled plankton species may flourish in altered oceans.[57]
[53] is directly proportional to its saturation state.CaCO 3 This decrease in saturation state is believed to be one of the main factors leading to decreased calcification in marine organisms, as the inorganic precipitation of [52] and raises the saturation horizons of both forms closer to the surface.CaCO 3 levels and the resulting lower pH of seawater decreases the saturation state of CO 2 Increasing [10] Calcium carbonate occurs in two common
The decrease in the concentration of CO32− decreases Ω, and hence makes CaCO 3 dissolution more likely.
Here Ω is the product of the concentrations (or activities) of the reacting ions that form the mineral (Ca2+ and CO2− 3), divided by the product of the concentrations of those ions when the mineral is at equilibrium (K sp), that is, when the mineral is neither forming nor dissolving.[50] In seawater, a natural horizontal boundary is formed as a result of temperature, pressure, and depth, and is known as the saturation horizon, or lysocline.[27] Above this saturation horizon, Ω has a value greater than 1, and CaCO 3 does not readily dissolve. Most calcifying organisms live in such waters.[27] Below this depth, Ω has a value less than 1, and CaCO 3 will dissolve. However, if its production rate is high enough to offset dissolution, CaCO 3 can still occur where Ω is less than 1. The carbonate compensation depth occurs at the depth in the ocean where production is exceeded by dissolution.[51]
{\Omega} = \frac{\left[\textrm{Ca}^{2+}\right] \left[\textrm{CO}_{3}^{2-}\right]}{K_{sp}}
The saturation state (known as Ω) of seawater for a mineral is a measure of the thermodynamic potential for the mineral to form or to dissolve, and is described by the following equation:
These increases in concentrations of dissolved carbon dioxide and bicarbonate, and reduction in carbonate, are shown in a Bjerrum plot.
Of the extra carbon dioxide added into the oceans, some remains as dissolved carbon dioxide, while the rest contributes towards making additional bicarbonate (and additional carbonic acid). This also increases the concentration of hydrogen ions, and the percentage increase in hydrogen is larger than the percentage increase in bicarbonate,[49] creating an imbalance in the reaction HCO3− \leftrightarrow CO32− + H+. To maintain chemical equilibrium, some of the carbonate ions already in the ocean combine with some of the hydrogen ions to make further bicarbonate. Thus the ocean's concentration of carbonate ions is reduced, creating an imbalance in the reaction Ca2+ + CO32− \leftrightarrow CaCO3, and making the dissolution of formed CaCO 3 structures more likely.
Changes in ocean chemistry can have extensive direct and indirect effects on organisms and their habitats. One of the most important repercussions of increasing ocean acidity relates to the production of shells and plates out of calcium carbonate (CaCO 3).[27] This process is called calcification and is important to the biology and survival of a wide range of marine organisms. Calcification involves the precipitation of dissolved ions into solid CaCO 3 structures, such as coccoliths. After they are formed, such structures are vulnerable to dissolution unless the surrounding seawater contains saturating concentrations of carbonate ions (CO32−).
A 2013 study claimed acidity was increasing at a rate 10 times faster than in any of the evolutionary crises in Earth's history.[47] In a synthesis report published in Science in 2015, 22 leading marine scientists stated that CO2 from burning fossil fuels is changing the oceans' chemistry more rapidly than at any time since the Great Dying, Earth's most severe known extinction event, emphasizing that the 2 °C maximum temperature increase agreed upon by governments reflects too small a cut in emissions to prevent "dramatic impacts" on the world's oceans, with lead author Jean-Pierre Gattuso remarking that "The ocean has been minimally considered at previous climate negotiations. Our study provides compelling arguments for a radical change at the UN conference (in Paris) on climate change".[48]
In the 15-year period 1995–2010 alone, acidity has increased 6 percent in the upper 100 meters of the Pacific Ocean from Hawaii to Alaska.[46] According to a statement in July 2012 by Jane Lubchenco, head of the U.S. National Oceanic and Atmospheric Administration "surface waters are changing much more rapidly than initial calculations have suggested. It's yet another reason to be very seriously concerned about the amount of carbon dioxide that is in the atmosphere now and the additional amount we continue to put out."[14]
"The natural pH of the ocean is determined by a need to balance the deposition and burial of CaCO 3 on the sea floor against the influx of Ca2+ and CO2− 3 into the ocean from dissolving rocks on land, called weathering. These processes stabilize the pH of the ocean, by a mechanism called CaCO 3 compensation...The point of bringing it up again is to note that if the CO 2 concentration of the atmosphere changes more slowly than this, as it always has throughout the Vostok record, the pH of the ocean will be relatively unaffected because CaCO 3 compensation can keep up. The [present] fossil fuel acidification is much faster than natural changes, and so the acid spike will be more intense than the earth has seen in at least 800,000 years."
A review by climate scientists at the RealClimate blog, of a 2005 report by the Royal Society of the UK similarly highlighted the centrality of the rates of change in the present anthropogenic acidification process, writing:[45]
[44][43] examined the geological record in an attempt to find a historical analog for current global conditions as well as those of the future. The researchers determined that the current rate of ocean acidification is faster than at any time in the past 300 million years.Science A 2012 paper in the journal [42][41] A National Research Council study released in April 2010 likewise concluded that "the level of acid in the oceans is increasing at an unprecedented rate."[40] and the rate of increase is about ten times the rate that preceded the Paleocene–Eocene mass extinction. The current and projected acidification has been described as an almost unprecedented geological event.[39] Current rates of ocean acidification have been compared with the greenhouse event at the Paleocene–Eocene boundary (about 55 million years ago) when surface ocean temperatures rose by 5–6 degrees
One of the first detailed datasets to examine how pH varied over a period of time at a temperate coastal location found that acidification was occurring much faster than previously predicted, with consequences for near-shore benthic ecosystems.[35][36] Thomas Lovejoy, former chief biodiversity advisor to the World Bank, has suggested that "the acidity of the oceans will more than double in the next 40 years. This rate is 100 times faster than any changes in ocean acidity in the last 20 million years, making it unlikely that marine life can somehow adapt to the changes."[37] It is predicted that, by the year 2100, the level of acidity in the ocean will reach the levels experienced by the earth 20 million years ago.[9][38]
Although the largest changes are expected in the future,[10] a report from spawned there, and though the study only dealt with the area from Vancouver to Northern California, the authors suggest that other shelf areas may be experiencing similar effects.[30]
Since the industrial revolution began, it is estimated that surface ocean pH has dropped by slightly more than 0.1 units on the logarithmic scale of pH, representing about a 29% increase in H+ . It is expected to drop by a further 0.3 to 0.5 pH units[9] (an additional doubling to tripling of today's post-industrial acid concentrations) by 2100 as the oceans absorb more anthropogenic CO 2, the impacts being most severe for coral reefs and the Southern Ocean.[2][10][27] These changes are predicted to continue rapidly as the oceans take up more anthropogenic CO 2 from the atmosphere. The degree of change to ocean chemistry, including ocean pH, will depend on the mitigation and emissions pathways[28] society takes.[29]
Caldeira and Wickett (2003)[2] placed the rate and magnitude of modern ocean acidification changes in the context of probable historical changes during the last 300 million years.
Dissolving CO 2 in seawater increases the hydrogen ion (H+ ) concentration in the ocean, and thus decreases ocean pH, as follows:[26]
The resistance of an area of ocean to absorbing atmospheric CO 2 is known as the Revelle factor.
When CO 2 dissolves, it reacts with water to form a balance of ionic and non-ionic chemical species: dissolved free carbon dioxide (CO 2(aq)), carbonic acid (H 2CO 3), bicarbonate (HCO− 3) and carbonate (CO2− 3). The ratio of these species depends on factors such as solubility pump.
[25] present in the Earth's oceans. 2CO
Deforestation, Climate change and agriculture, Carbon dioxide, Ozone depletion, Renewable energy
Nasa, Antarctica, Solar System, Evolution, Apollo program
Isaac Newton, Peer review, Charles, Prince of Wales, Paul Nurse, University of Cambridge
Pollution, Phosphorus, Global warming, Mercury (element), Nitrogen
Global warming, India, United States Environmental Protection Agency, Canada, Smog
Global warming, Africa, North America, Asia, Intergovernmental Panel on Climate Change
Global warming, Pollution, Edward Teller, Aluminium, New Mexico