Meghan Hodges
Marine pollution is a pressing issue that poses a threat to marine ecosystems, wildlife, human life, and economies worldwide. The ocean, which covers over 70% of the Earth's surface, is bombarded with pollution from human activities, such as the use of single-use plastics, agricultural runoff, oil spills, and carbon emissions. While pollution affects all parts of the ocean, certain areas have become notorious for their high levels of pollution, such as the Great Pacific Garbage Patch, located between Hawaii and California, and the Indian Ocean, which is the second most polluted ocean.
| Characteristics | Values |
|---|---|
| Main sources of ocean pollution | Nonpoint source pollution, Point source pollution |
| Nonpoint source pollution examples | Septic tanks, vehicles, farms, ranches, forest areas, oil, grease, toxic chemicals, dirt, silt, air pollution, fertilizer, etc. |
| Point source pollution examples | Oil spills, chemical spills, faulty factories, water treatment systems, etc. |
| Most polluted ocean | Indian Ocean |
| Second most polluted ocean | Pacific Ocean |
| Most polluted area in Pacific Ocean | Great Pacific Garbage Patch |
| Size of Great Pacific Garbage Patch | 1.6 million square kilometers or twice the size of Texas |
| Composition of Great Pacific Garbage Patch | 92% larger objects, 8% microplastics |
| Other polluted areas in Pacific Ocean | Kanapou Bay, Hawaii |
| Common types of marine debris | Plastic items (shopping bags, beverage bottles, plastic bottles and caps, straws, cups, plates, single-use plastic bags, etc.), cigarette butts, bottle caps, food wrappers, fishing gear, etc. |
| Plastic pollution causes | Poor waste management, littering, storm winds, storms and heavy rain events, etc. |
| Plastic pollution hotspots | Coastal cities in middle-income countries |
| Impact of plastic pollution | Marine life is harmed, dead zones appear due to nutrient pollution, marine ecosystems are exposed to carbon emissions, etc. |
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What You'll Learn
The Great Pacific Garbage Patch
Marine debris, or litter that ends up in oceans, seas, and other large bodies of water, accounts for a significant portion of ocean pollution. One of the most polluted areas in the ocean is the Great Pacific Garbage Patch (GPGP), located in the North Pacific Ocean between Hawaii and California. This area is also known as the Pacific trash vortex or the North Pacific Garbage Patch.
The GPGP is the largest accumulation of plastic in the open ocean, with an estimated surface area of 1.6 million square kilometers, or twice the size of Texas and triple the size of France. The patch is not a solid mass of trash, as is commonly believed, but rather a "plastic soup" with a high concentration of microplastics. It is estimated that the GPGP contains 1.8 trillion pieces of plastic larger than 0.5 mm, with a total mass of 100,000 to 129,000 metric tons. This includes items such as plastic lighters, toothbrushes, water bottles, pens, baby bottles, cell phones, plastic bags, and nurdles, some of which are over 50 years old.
The GPGP formed gradually as ocean currents collected marine pollution, particularly from the Pacific Rim countries in Asia, North America, and South America. The North Pacific Subtropical Gyre, a large system of swirling ocean currents, bounds the entire GPGP. The gyre's rotational pattern draws in waste material from across the North Pacific, including coastal waters off North America and Japan. The convergence zone within the gyre, where warm water from the South Pacific meets cooler water from the Arctic, acts as a highway for moving debris from one patch to another.
The microplastics in the GPGP are often microscopic, making the water appear cloudy rather than like a solid mass of garbage. However, larger items such as fishing gear and shoes are also present in the patch. The patch is rapidly accumulating, with an estimated 1.15 to 2.41 million tons of plastic entering the ocean each year from rivers. The Ocean Cleanup organization has been working to clean up the GPGP, removing over one million pounds of trash by the end of 2024.
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Plastic pollution
The Great Pacific Garbage Patch is the most well-known accumulation of plastic in the ocean. Located in the North Pacific Ocean, between Hawaii and California, it is estimated to be twice the size of Texas, with 1.8 trillion pieces of plastic larger than 0.5mm. The Great Pacific Garbage Patch is not a solid mass but is more akin to a plastic soup, with 180 times more plastic than biomass.
The plastic in the Great Pacific Garbage Patch comes from all over the world, with 81% of ocean plastics emitted from Asia. Rivers are the primary way that plastic reaches the ocean, with coastal cities in middle-income countries being the world's plastic emissions hotspots. The Ciliwung River, for example, emits a lot of plastic into the ocean due to its proximity to the ocean and high rainfall. Coastal cities in middle-income countries tend to have inadequate waste management systems, which, alongside heavy rainfall, increases plastic emissions.
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Oil spills
The Deepwater Horizon oil spill in the Gulf of Mexico in 2010 is a notable example of a major oil spill. It had significant environmental consequences and contributed to advancements in oil spill science. Oil spills harm ocean life in two primary ways: fouling or oiling, and oil toxicity. Fouling or oiling occurs when oil physically harms a plant or animal, such as coating a bird's wings and rendering it unable to fly, or stripping away the insulating properties of a sea otter's fur, making it susceptible to hypothermia. The degree of oiling impacts the survival chances of the affected animal.
Oil is also toxic and contains various compounds that can cause heart damage, stunted growth, immune system issues, and even death in animals. Oil spills reduce the level of dissolved oxygen in the water and block sunlight from penetrating the surface, further harming aquatic life. They also damage the habitats and reproductive rates of animals, slowing the long-term recovery of populations. Oil spills frequently lead to the suspension of commercial fishing to prevent the sale and consumption of contaminated seafood.
Additionally, oil spills can have significant economic repercussions. They can affect tourism and commerce, especially if beaches and populated shorelines are impacted. Power plants and other utilities that rely on seawater may also be disrupted. The costs of paying compensation to individuals and communities affected by oil spills have incentivized efforts to reduce the likelihood of such incidents. While there is no thoroughly satisfactory method for cleaning up major oil spills, advancements in technology, such as satellite monitoring and renewable wood sponges, are being used to address this complex issue.
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Nonpoint source pollution
Eighty percent of marine pollution comes from land-based sources. One of the biggest sources of pollution is nonpoint source pollution, which occurs as a result of runoff. Nonpoint source pollution is harder to identify and address than point-source pollution because it comes from multiple locations and varies over time in terms of flow and pollutant types.
In rural areas, runoff can wash sediment from roads in logged-over forest areas. It can also carry acid from abandoned mines and flush pesticides and fertilizer from farm fields. Farms and livestock ranches are significant sources of nonpoint source pollution. For example, fertilizer from yards can accumulate in the ocean, and plastic pollution from farms can end up in rivers and oceans.
Airborne pollutants are major contributors to acid rain, which is considered nonpoint-source pollution. In the United States, the Clean Air Act and the Clean Water Act have helped to limit both point-source and nonpoint-source pollution.
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Chemical pollution
One of the primary sources of chemical pollution in the ocean is runoff from land. This includes nonpoint source pollution, which originates from various small and large sources, such as septic tanks, vehicles, farms, and ranches. When it rains, floods, or there is stormwater, these pollutants are transported into nearby streams, rivers, and estuaries, which eventually flow into the ocean. Urban areas and agricultural activities contribute significantly to this type of pollution, with chemicals from sewage leaks, fertilizer use, and ineffective water treatment making their way into marine ecosystems.
Industrial activities also contribute to chemical pollution in the ocean. Factory runoff, chemical contamination, and the discharge of waste from energy production sites can introduce a range of toxic substances into the marine environment. These substances, such as oil, grease, and industrial chemicals, can have harmful effects on marine life and ecosystems. Additionally, the use of pesticides and insecticides, such as DDT, in agriculture and other industries, poses a significant threat to both environmental and human health. These chemicals can climb up the food chain, causing diseases and even leading to the endangerment of certain species, such as the bald eagle.
Another significant contributor to chemical pollution in the ocean is the use of pharmaceutical, health, and personal care products. These products can contain chemicals that are not effectively removed by water treatment processes, ultimately finding their way into marine ecosystems. Additionally, marine debris, such as plastic detergent bottles, crates, and buoys, can contribute to chemical pollution. As plastic breaks down into microplastics, small organisms ingest these particles, absorbing the chemicals into their tissues. These toxins then migrate up the food chain, eventually reaching humans.
The impact of chemical pollution on the ocean is widespread and concerning. It can lead to the contamination of marine food webs, with higher concentrations of chemicals found in organisms higher up the food chain. This can result in toxic effects on marine life and even human health. Additionally, chemical pollution can contribute to eutrophication, leading to the formation of algal blooms. When these dense algal blooms die off, they deplete the dissolved oxygen in the water, creating "dead zones" where fish and other organisms struggle to survive. These dead zones can have far-reaching consequences for fisheries and tourism.
Addressing chemical pollution in the ocean requires a multifaceted approach. It involves implementing stricter regulations on the use of pesticides and other harmful chemicals, improving waste management and water treatment processes, and reducing the use of disposable plastics. By tackling these issues at their source, we can help mitigate the impacts of chemical pollution on our oceans and protect the delicate balance of marine ecosystems.
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Frequently asked questions
The Great Pacific Garbage Patch, located in the North Pacific Ocean between Hawaii and California, is the most polluted and well-studied gyre in the ocean. It is estimated to be twice the size of Texas, or triple the size of France or Thailand. The Indian Ocean is the second most polluted ocean in the world, with 11 million tonnes of plastic dumped into it each year.
The biggest cause of ocean pollution is non-point source pollution, which occurs when rainfall or snowmelt moves across the ground, picking up pollutants along the way and depositing them into bodies of water. Non-point source pollution can come from many sources, including septic tanks, vehicles, farms, and boats.
The two main types of ocean pollution are chemicals and trash, with plastic pollution being the most common type of trash found in the ocean. Marine debris includes plastic items like shopping bags, beverage bottles, cigarette butts, bottle caps, food wrappers, and fishing gear.
Ocean pollution has damaged the environment, the health of organisms, and economic structures worldwide. Plastic waste is particularly harmful as it can take hundreds of years to decompose. Fish and other marine animals can become tangled in plastic debris or mistake it for food. Nutrient pollution, caused by agricultural runoff, can create vast dead zones in the ocean with low oxygen levels, leading to mass die-offs of marine life.
