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OCEAN ACIDIFICATION Starting with the Science CONTENTS OCEAN ACIDIFICATION Starting with the Science CONTENTS Introduction 1 The Carbon Cycle 2-3 Evidence of Excess Carbon Dioxide 4-5 The Chemistry of Ocean Acidification 6 Biological Processes Affected by Ocean Acidification 7 Effects on Shellfish, Corals, and Other Calcifiers 8-9 Potential Impacts on Ecosystems 10-13 How will Changing Ecosystems Impact People? 14-15 Where Do We Go From Here? 16 Covering more than 70 percent of the Earth’s surface, the ocean is one of planet Earth’s most distinguishing characteristics. Over recent decades, a range of human activities such as the burning of fossil fuels is increasing the amount of carbon dioxide gas emitted to the atmosphere—and the amount that dissolves into the ocean. Now, so much carbon dioxide has been absorbed by the ocean that the chemistry of seawater is changing, causing the ocean to become more acidic. Based on the latest science, this booklet describes the well-understood chemistry of ocean acidification and explores the many questions that remain: How will ocean acidification impact marine life such as fish, corals, and shellfish? How will the effects on individual species scale up to whole ecosystems? What will ocean acidification mean for aquaculture, the fishing industry, and coastal tourism? THE CARBON CYCLE Carbon dioxide is a natural part of Earth’s atmosphere Not all of the excess carbon dioxide stays in the atmosphere. and one of several gases that contribute to the “green- Scientists estimate that one-third of all the carbon dioxide house effect,” which traps heat and helps make Earth produced by human activities has been absorbed by the ocean. habitable. Normally, the Earth’s carbon cycle maintains The ocean’s removal of carbon dioxide from the atmosphere has a natural balance of carbon in the atmosphere, land, undoubtedly helped curb the extent of climate change—but this and ocean through the “breathing of the planet” (see benefit has come at a cost. The absorption of carbon dioxide is Box 1). However, since the beginning of the industrial fundamentally changing the chemistry of the ocean by triggering era, emissions of carbon dioxide have climbed rapidly, reactions that make seawater more acidic, a phenomenon called and now are exceeding the capacity of the carbon cycle ocean acidification. In fact, the ocean has become nearly 30 to maintain an equilibrium between the atmosphere percent more acidic than it was at the beginning of the industrial and ocean. Excess carbon dioxide traps more heat in era—a change larger and more rapid than seen in the fossil record the atmosphere, which changes the Earth’s climate. going back at least 800,000 years, before the appearance of vertebrates and plants in the fossil record. 2 Carbon is continually exchanged between the atmosphere, ocean, biosphere, and land. BOX 1 THE CARBON CYCLE There are short- and long-term cycles at work. C0 2 Short-Term Cycles Carbon dioxide is exchanged rapidly between plants and s si animals through respiration e n th o n and photosynthesis, and ti y a s r between the ocean and the i to p o s h atmosphere through gas ex- e P R change. The burning of fossil Fossil Fuel fuels releases carbon dioxide Emissions Exchange to the atmosphere. of CO2 Volcanic Eruptions Long-Term Cycle Over millions of years, carbon Weathering dioxide in the air combines of Rocks with rainwater to form weak acids that very slowly dissolve rocks. Rivers and streams carry these minerals to the oceans where they are used by animals to form coral reefs and shells and help Waste and Decay balance the pH of the ocean. of Dead Organisms Over even longer time periods, organic carbon (formed from the remains of marine life) becomes stored deep within the Earth’s crust and forms Fossil Fuels, Limestone fossil fuels, such as oil and Coal, Oil, and Gas (Calcium Carbonate) natural gas. Some of this carbon will be released back into the atmosphere by vol- Long Term Short Term canoes, completing the cycle. Photosynthesis Respiration Marine Deposits Emissions Exchange 3 up his equipment at the Mauna Loa Observatory in Hawaii, EVIDENCE OF EXCESS far from the localized effects of fossil fuels, to take precise, CARBON DIOXIDE daily measurements of atmospheric carbon dioxide levels. The now famous “Keeling Curve” documents a steady increase in For the first half of the twentieth century, atmospheric carbon dioxide that continues today, providing scientists thought the excess carbon dioxide evidence that natural carbon cycling is not keeping pace with human carbon dioxide emissions. from fossil fuel emissions would be taken up With evidence of carbon dioxide accumulating in the at- by vegetation and absorbed by the immense mosphere, oceanographers decided they should track carbon ocean without accumulating in the atmosphere. concentrations in the ocean to see if carbon dioxide was also But a key paper published in 1957 by Roger accumulating there. Studies that began in the mid 1980s have Revelle, director of the Scripps Institution of shown that the concentration of carbon dioxide in the ocean Oceanography, together with chemist Hans is increasing in parallel with the rise in atmospheric carbon Suess, hypothesized that the ocean would dioxide (see Figure 1). At the same time, the pH of the ocean is decreasing (becoming more acidic), indicating that carbon absorb carbon dioxide at a much slower rate dioxide levels have exceeded the ocean’s natural capacity to than was previously thought. buffer pH. The paper is widely regarded as the initial study of global warm- ing because it recognized that if the ocean could not take up all of the carbon dioxide from fossil fuels, the excess must be accumulating in the atmosphere. To help test this hypothesis, Revelle hired Charles David Keeling, a young researcher who had de- veloped the first instrument for ac- curately measuring atmospheric carbon dioxide levels while he was a (Above) Charles David Keeling points to carbon dioxide data postdoctoral fellow at the California records now called the “Keeling Curve” 4 Institute of Technology. Keeling set (Left) Roger Revelle works in his laboratory Figure 1. Ocean carbon dioxide and pH measurements near Hawaii at Station WHY CARBON DIOXIDE MAKES ALOHA. 1988-2007 SEAWATER MORE ACIDIC 380 Scientists use pH—a measure of the concentration of hydrogen ions using a logarithmic scale—as an indicator of the acidity of 360 a solution. As the hydrogen ion concentration increases, a so- lution becomes more acidic and its pH decreases. Because the 340 scale is logarithmic, a decrease of one pH unit corresponds to a (µatm) 10-fold increase in acidity. 2 320 CO p 300 8.20 Lye, liquid drain 14 cleaner 13 8.15 pH 12 Ammonia 11 8.10 10 Milk of Magnesia 8.05 9 BASIC 8.1 Sea water (recent average) 89 91 93 95 97 99 01 03 05 07 NEUTRAL 7 Pure water Year 6 Milk This figure demonstrates that as carbon dioxide in the air and ocean ACIDIC increases over time, the pH in the seawater decreases (Dore et al., 2009). 5 Top: Calculated partial pressure of carbon dioxide in seawater (blue •), and in air at nearby Mauna Loa (red •)*. Bottom: Direct measurement 4 of pH in surface seawater (orange •) compared with calculated pH (green •)*. Scientists measure “partial pressure” of carbon dioxide (pCO2), the pres- 3 sure that carbon dioxide gas exerts if it were alone in a container instead of Vinegar being a component of the mixture of gases in the atmosphere or ocean, in units called microatmospheres. 2 Lemon Juice 1 Battery Acid * calculated partial pressure CO2 and pH are based on measurements of the chemical properties of seawater at Station ALOHA. Please see Dore et al., 0 5 2009 for more details; full citation on inside back cover of booklet. Some of the extra hydrogen ions react with carbonate THE CHEMISTRY OF 2- ions (CO3 ) to form more bicarbonate. This makes carbonate OCEAN ACIDIFICATION ions less abundant—a problem for many marine species that absorb carbonate from seawater and use it to build calcium Atmospheric carbon dioxide is absorbed by the carbonate shells and skeletons in a process called calcification. ocean, where it reacts with seawater to form As carbonate becomes less abundant, these organisms, such as corals and clams, have more difficulty building and maintain- carbonic acid (H2CO3). Almost immediately, carbonic acid dissociates to form bicarbonate ing their shells and skeletons. - + Increased acidity can even cause some carbonate shells ions (HCO3 ) and hydrogen ions (H ). As the concentration of hydrogen ions increases, the and skeletons to dissolve. Hydrogen ions react with the solid calcium carbonate (CaCO ) and convert it to soluble bicarbonate water becomes more acidic. 3 - 2+ (HCO3 ) and (Ca ) ions. BOX 2 CARBONATE CHEMISTRY 6 BIOLOGICAL PROCESSES AFFECTED BY OCEAN ACIDIFICATION Increasing acidity, which also changes the carbonate chemistry of seawater, combined with other environmental stressors like increasing ocean temperature and pollution, has the potential to affect many biological processes. Maintaining Metabolism Obtaining Essential Many physiological processes are fine- Minerals and Nutrients tuned to operate within a narrow pH Ocean acidification could make range; outside of that range, the bio- it harder for marine organisms chemical reactions may be too slow or to absorb nitrogen, phosphorus, inefficient to keep the organism healthy. iron, and other elements es- Although many species can adjust to sential for growth. For example, changes in their surroundings by ac- when seawater becomes more tively maintaining a constant internal acidic, iron attaches to organic environment, this maintenance requires compounds, preventing marine a significant expenditure of energy. An life from using this essential adult fish may be able to compensate element.
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