Ethan Clarke
Plastic pollution is a pressing issue that has been linked to ocean acidification, a process that occurs when the water's chemistry is altered as CO2 is absorbed by seawater, reducing pH levels and vital minerals like calcium carbonate. This decrease in pH obstructs the ability of marine organisms to build skeletons and shells, threatening marine life and ecosystems. While the primary cause of ocean acidification is greenhouse gas emissions, recent studies have indicated that plastic also contributes to this process, with plastic leaching potentially reducing seawater pH by up to 0.5 units. The impact of plastic on the inorganic chemistry of seawater requires further investigation, but it is clear that plastic pollution poses a significant threat to the health of our oceans and the life they support.
| Characteristics | Values |
|---|---|
| Does plastic change the pH of water? | Plastic dumped into oceans is correlated with ocean acidification, which occurs when the water's chemistry is altered as CO2 is absorbed. |
| Plastics' impact on ocean pH | It is estimated that the pH of surface waters has fallen by about 0.1 pH units on average. Plastic leaching could produce a seawater pH decrease of up to 0.5 units. |
| Impact of ocean acidification | Ocean acidification obstructs the ability of marine organisms, such as corals, plankton, oysters, and urchins, to build skeletons and shells out of calcium carbonate, threatening their survival. |
| Impact on marine life | Marine life is threatened by plastic pollution, with turtles getting tangled in discarded nets, whales ingesting plastic bags, and fish and other organisms poisoning themselves by consuming microplastics. |
| Solutions | Organisations like the International Alliance To Combat Ocean Acidification are working to raise awareness about plastic pollution. Reducing single-use plastic production is crucial for ocean rejuvenation. |
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What You'll Learn
Plastic waste in oceans is correlated with ocean acidification
The world's oceans absorb about 30% of humanity's carbon emissions, which has resulted in a decrease in pH across the globe. This process of ocean acidification obstructs the ability of marine organisms, such as corals, plankton, oysters, and urchins, to build skeletons and shells out of calcium carbonate and to survive in general.
Ocean acidification is caused by the absorption of CO2 into the seawater, which alters the water's chemistry. It is worsened by pollution from plastic waste dumped into the oceans. A study conducted off the coast of Japan's Shikine Island found that an increase in CO2 accelerated bacterial distribution on plastic waste, which can further contribute to ocean acidification.
The accumulation of bacteria on plastic waste in the ocean is referred to as the "plastisphere". These bacteria can damage marine ecosystems, such as the Photobacterium rosenbergii, which has been linked to coral bleaching. In addition, plastic waste can act as a sorbent and transporter for contaminants such as pesticides, pharmaceuticals, and personal care products, further exacerbating the problem of ocean acidification.
While the impact of plastic waste on ocean acidification is significant, it is important to note that other factors, such as greenhouse gas emissions, also play a major role. Nevertheless, the presence of plastic in the ocean is a critical issue that needs to be addressed. Organizations such as the International Alliance to Combat Ocean Acidification are working to spread awareness about the impacts of plastic pollution. Reducing the production of single-use plastic is a crucial step in ensuring the ocean can rejuvenate itself.
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Ocean acidification and its threat to marine life
Ocean acidification is a significant threat to marine life, and it is caused by the increasing levels of carbon dioxide in the atmosphere. The oceans absorb carbon dioxide, which alters the water's chemistry and reduces the pH, resulting in greater acidity. This process is known as "climate change's evil twin" because it is a harmful consequence of excess carbon dioxide that is not immediately visible. Since the industrial era, the ocean has absorbed around 525 billion tons of carbon dioxide, absorbing approximately 22 million tons daily.
The increased acidity of the ocean water has severe implications for marine life, particularly for organisms that rely on carbonate-based shells and skeletons. The availability of carbonate is reduced, making it difficult for these creatures to build and maintain their shells. Species such as oysters, clams, lobsters, shrimp, and coral reefs are vulnerable to the effects of ocean acidification, which has been likened to osteoporosis of the sea. The increased acidity also affects the health of organisms, as they must expend more energy to maintain healthy body fluid chemistry, which can impair their overall health and development.
The impact of ocean acidification on coral reefs is particularly concerning. Coral reefs provide habitats for various marine animals and offer complex reef systems that enhance the resilience of the entire ecosystem. However, ocean acidification weakens coral structures, with branching corals struggling to survive in acidified waters. This threat to coral reefs is evident in the Caribbean and cold-water reefs off Scotland and Norway, and it also poses a risk to the Great Barrier Reef.
The consequences of ocean acidification extend beyond the direct effects on marine life. It also impacts fisheries and aquaculture, threatening native fisheries in Patagonian waters and affecting food sources for fish, birds, and marine mammals in Antarctic waters. Additionally, the increased acidity fosters the growth of harmful algal species, which produce more toxins and bloom faster, potentially harming both marine life and humans who consume contaminated shellfish.
The threat of ocean acidification has prompted organizations like the International Alliance to Combat Ocean Acidification to collaborate with governments and scientific networks to raise awareness. The International Partnership for Blue Carbon, including governments such as Australia, the UK, Belize, and Mauritius, aims to share knowledge and drive practical action. While some marine species may adapt to more acidic conditions, the overall impact on ocean ecosystems is expected to be dramatic and negative, with the potential for mass extinctions.
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Plastic leaching and its impact on ocean pH
Plastic leaching is a process that occurs when plastic degrades and releases organic acids and carbon dioxide. This process has been linked to ocean acidification, which is a decrease in the pH of seawater. Ocean acidification is primarily caused by the absorption of carbon dioxide (CO2) by seawater, which alters the chemistry of the water.
Plastic pollution in the ocean has been identified as a contributing factor to ocean acidification. The presence of plastic waste in the ocean enhances the absorption of CO2, further reducing the pH of the seawater. Laboratory experiments have confirmed that abiotic plastic degradation, particularly in aged plastics found in the ocean, induces a decrease in seawater pH. The release of organic acids and the production of CO2 from plastic degradation contribute to this effect.
The impact of plastic leaching on ocean pH is more pronounced in coastal areas where plastic debris accumulates. In these regions, plastic leaching could lead to a seawater pH decrease of up to 0.5 units. This change in pH can have significant consequences for marine life, particularly for organisms that rely on calcium carbonate to build their skeletons and shells.
The increase in plastic pollution in the ocean is a growing concern. It is estimated that nearly 13 million metric tons of plastic reach the ocean each year, and this number could rise in the future. The accumulation of plastic waste in the ocean provides a surface for the growth of harmful bacteria and microorganisms, which further contribute to the degradation of marine ecosystems.
The impact of plastic leaching on ocean pH highlights the importance of addressing plastic pollution. While organizations and governments are working to raise awareness and take action, it is crucial to reduce the production and use of single-use plastics to mitigate the effects of plastic pollution on ocean health and, by extension, the pH of seawater.
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Plastic as a sorbent and transporter of contaminants
Plastic debris in the marine environment, including resin pellets, fragments, and microscopic plastic fragments, contains organic contaminants, including polychlorinated biphenyls (PCBs), polycyclic aromatic hydrocarbons, and petroleum hydrocarbons. These contaminants can be transferred from plastic to organisms, as demonstrated by a feeding experiment that showed PCBs could be transferred from contaminated plastics to streaked shearwater chicks.
Plastic acts as a sorbent of contaminants, with hydrophobic organic contaminants showing a greater affinity for plastics compared to natural sediments. This is due to the “scavenging” of the contaminant by the highly sorbent plastic, which reduces the equilibrium concentrations in other phases, including organisms. The sorption of contaminants to plastics can also be influenced by factors such as the properties of the sorbent and sorbate, dissolved organic compounds in the aqueous phase, pH, and temperature.
The high uptake of contaminants onto plastics and their longevity in the environment mean that plastic debris is unlikely to remain uncontaminated for extended periods. Plastics can act as transporters of contaminants, with floating plastics becoming negatively buoyant due to fouling and acting as a transporter of contaminants into offshore and strandline sediments. The addition of small quantities of plastic with sorbed contaminants to sediment can result in a significant increase in contaminant accumulation by sediment-dwelling organisms.
Furthermore, plasticizers, plastic additives, and constitutional monomers present in the environment can leach from waste disposal sites into groundwater and surface waters, posing potential threats to terrestrial environments.
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The impact of plastic on ocean bacteria
Plastic pollution in the ocean has a detrimental impact on marine life, including bacteria. The durability of plastic means that once it enters the ocean, it persists for long periods and can be transported by waves and storms to even the most remote areas of the ocean. Marine organisms are threatened by ingestion of and entanglement in plastic, and the accumulation of plastic waste in the ocean has been linked to ocean acidification, which reduces water pH levels.
Research has shown that plastic pollution can negatively impact marine bacteria, including photosynthetic bacteria such as Prochlorococcus, which is one of the most abundant photosynthetic organisms on Earth. Prochlorococcus plays a crucial role in the marine food chain and contributes significantly to global carbon fixation and oxygen production. Exposure to leachates from common plastics has been found to inhibit the growth, photosynthesis, and oxygen production of Prochlorococcus.
Plastics can leach organic compounds and metals that negatively impact the growth of microorganisms, including marine larvae and algae. They often contain additives such as UV stabilizers, plasticizers, metals, dyes, and flame retardants, which are not chemically bound to the polymer and can end up in the environment. These substances can have toxic effects on marine life, including bacteria.
In addition, plastic pollution can alter the distribution of bacteria in the ocean. A study conducted off the coast of Japan's Shikine Island found that an increase in CO2 levels accelerated bacterial distribution, with 350 unique groups of bacteria found on plastics. Certain groups of bacteria may even benefit from marine plastic debris, as it provides a source of dissolved organic carbon for them to metabolize.
The impact of plastic pollution on ocean bacteria is an area of ongoing research, and it is recognized that plastic pollution may have a wider range of impacts on marine organisms than previously understood. While some bacteria may benefit from plastic debris, the overall effect of plastic pollution on ocean bacteria is detrimental, contributing to disruptions in the marine food web and biogeochemical cycling.
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Frequently asked questions
Plastic pollution in water has been linked to ocean acidification, which is caused by the absorption of CO2. The release of organic acids and the production of CO2 from plastic leaching can decrease seawater pH by up to 0.5 units.
Plastic waste in oceans can become a breeding ground for harmful bacteria and microorganisms, known as the "plastisphere". These bacteria can damage marine ecosystems and contribute to coral bleaching.
Ocean acidification can disrupt the ability of marine organisms, such as corals, plankton, oysters, and urchins, to build skeletons and shells from calcium carbonate. This can have widespread impacts on marine life and ecosystems, potentially threatening human life if left unchecked.
