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Garbage patch

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Trash washed ashore in Hawaii from theGreat Pacific Garbage Patch

Agarbage patchis agyreofmarine debrisparticles caused by the effects ofocean currentsand increasingplastic pollutionby human populations. These human-caused collections of plastic and other debris are responsible for ecosystem and environmental problems that affect marine life, contaminate oceans with toxic chemicals, and contribute togreenhouse gas emissions.Once waterborne, marine debris becomes mobile. Flotsam can be blown by the wind, or follow the flow of ocean currents, often ending up in the middle ofoceanic gyreswhere currents are weakest.

Within garbage patches, the waste is not compact, and although most of it is near the surface of the ocean, it can be found up to more than 30 metres (100 ft) deep in the water.[1]Patches contain plastics and debris in a range of sizes fromMicroplasticsand small scaleplastic pellet pollution,to large objects such asfishing netsand consumer goods and appliances lost from flood and shipping loss.

Garbage patches grow because of widespread loss of plastic from human trash collection systems. TheUnited Nations Environmental Programestimated that "for every square mile of ocean" there are about "46,000 pieces of plastic".[2]The 10 largest emitters of oceanic plastic pollution worldwide are, from the most to the least, China, Indonesia, Philippines, Vietnam, Sri Lanka, Thailand, Egypt, Malaysia, Nigeria, and Bangladesh,[3]largely through the riversYangtze,Indus,Yellow,Hai,Nile,Ganges,Pearl,Amur,Niger,and theMekong,and accounting for "90 percent of all the plastic that reaches the world's oceans".[4][5]Asia was the leading source of mismanagedplastic waste,with China alone accounting for 2.4 million metric tons.[6]

The best known of these is theGreat Pacific garbage patchwhich has the highest density of marine debris and plastic. The Pacific Garbage patch has two mass buildups: the western garbage patch and the eastern garbage patch, the former off the coast of Japan and the latter betweenHawaiiandCalifornia.These garbage patches contain 90 million tonnes (100 million short tons) of debris.[1]Other identified patches include theNorth Atlantic garbage patchbetween North America and Africa, theSouth Atlantic garbage patchlocated between eastern South America and the tip of Africa, theSouth Pacific garbage patchlocated west of South America, and theIndian Ocean garbage patchfound east of South Africa listed in order of decreasing size.[7]

Identified patches[edit]

Of the five gyres on this map, all have significant garbage patches.

In 2014, there were five areas across all the oceans where the majority of plastic concentrated.[8]Researchers collected a total of 3070 samples across the world to identify hot spots of surface level plastic pollution. The pattern of distribution closely mirrored models of oceanic currents with the North Pacific Gyre, orGreat Pacific Garbage Patch,being the highest density of plastic accumulation. The other four garbage patches include theNorth Atlantic garbage patchbetween the North America and Africa, theSouth Atlantic garbage patchlocated between eastern South America and the tip of Africa, theSouth Pacific garbage patchlocated west of South America, and theIndian Ocean garbage patchfound east of South Africa.[8]

Great Pacific[edit]

TheGreat Pacific garbage patch(also Pacific trash vortex and North Pacific garbage patch[9]) is a garbage patch, agyreofmarine debrisparticles, in the central North Pacific Ocean. It is located roughly from135°Wto155°Wand35°Nto42°N.[10]The collection of plastic and floating trash originates from thePacific Rim,including countries in Asia, North America, and South America.[11]

Despite the common public perception of the patch existing as giant islands of floating garbage, its low density (4 particles per cubic metre (3.1/cu yd)) prevents detection bysatellite imagery,or even by casual boaters or divers in the area. This is because the patch is a widely dispersed area consisting primarily of suspended "fingernail-sized or smaller" —often microscopic—particles in the upperwater columnknown asmicroplastics.[12]

Researchers fromThe Ocean Cleanupproject claimed that the patch covers 1.6 million square kilometres (620,000 square miles)[13]consisting of 45,000–129,000 metric tons (50,000–142,000 short tons) of plastic as of 2018.[14]Its goal is to remove half of the plastic pollution by 2027 using floating barriers anchored to the seabed.[15]The same 2018 study found that, while microplastics dominate the area by count, 92% of the mass of the patch consists of larger objects which have not yet fragmented into microplastics. Some of the plastic in the patch is over 50 years old, and includes items (and fragments of items) such as "plastic lighters, toothbrushes, water bottles, pens, baby bottles, cell phones, plastic bags, andnurdles".

Research indicates that the patch is rapidly accumulating.[14]The patch is believed to have increased "10-fold each decade" since 1945.[16]The gyre contains approximately six pounds of plastic for every pound ofplankton.[17]A similar patch of floating plastic debris is found in the Atlantic Ocean, called theNorth Atlantic garbage patch.[18][19]This growing patch contributes to other environmental damage to marine ecosystems and species.

South Pacific[edit]

TheSouth Pacific garbage patchis an area of ocean with increased levels ofmarine debrisand plastic particle pollution, within the ocean'spelagic zone.This area is in theSouth Pacific Gyre,which itself spans from waters east ofAustraliato theSouth Americancontinent, as far north as theEquator,and south until reaching theAntarctic Circumpolar Current.[20]The degradation of plastics in the ocean also leads to a rise in the level of toxics in the area.[21]The garbage patch was confirmed in mid-2017, and has been compared to theGreat Pacific garbage patch's state in 2007, making the former ten years younger. The South Pacific garbage patch is not visible on satellites, and is not a landmass. Most particles are smaller than a grain of rice.[22]A researcher said: "This cloud ofmicroplasticsextends both vertically and horizontally. It's more like smog than a patch ".[22]

Indian Ocean[edit]

TheIndian Ocean garbage patch,discovered in 2010, is a marine garbage patch, agyreofmarine litter,suspended in the upperwater columnof the centralIndian Ocean,specifically theIndian Ocean Gyre,one of the five major oceanicgyres.[23][24][25][26][27][28]The patch does not appear as a continuous debris field. As with other patches in each of the five oceanic gyres, the plastics in it break down to ever smaller particles, and to constituentpolymers.[29]As with the other patches, the field constitutes an elevated level ofpelagicplastics,chemical sludge,and otherdebris;primarily particles that are invisible to the naked eye. The concentration of particle debris has been estimated to be approximately 10,000 particles per square kilometer.[30][31][32][33]

North Atlantic[edit]

TheNorth Atlantic garbage patchis a garbage patch of man-mademarine debrisfound floating within theNorth Atlantic Gyre,originally documented in 1972.[34]A 22-year research study conducted by theSea Education Associationestimates the patch to be hundreds of kilometers across, with a density of more than 200,000 pieces of debris per square kilometer.[35][36][37][38]The garbage originates from human-created waste traveling from rivers into the ocean and mainly consists ofmicroplastics.[39]The garbage patch is a large risk to wildlife (and to humans) through plastic consumption and entanglement.[40]

There have only been a few awareness and clean-up efforts for the North Atlantic garbage patch, such as The Garbage Patch State atUNESCOandThe Ocean Cleanup,as most of the research and cleanup efforts have been focused on theGreat Pacific garbage patch,a similar garbage patch in the north Pacific.[41][42]

Environmental issues[edit]

Photodegradation of plastics[edit]

Washed-up plastic waste on a beach inSingapore

The North Atlantic patch is one of several oceanic regions where researchers have studied the effects and impact of plasticphotodegradationin the neustonic layer of water.[43]Unlike organic debris, whichbiodegrades,plastic disintegrates into ever smaller pieces while remaining apolymer(without changing chemically). This process continues down to the molecular level.[44]Some plastics decompose within a year of entering the water, releasing potentially toxic chemicals such asbisphenol A,PCBsand derivatives ofpolystyrene.[45]

As the plasticflotsamphotodegrades into smaller and smaller pieces, it concentrates in the upper water column. As it disintegrates, the pieces become small enough to be ingested by aquatic organisms that reside near the ocean's surface. Plastic may become concentrated inneuston,thereby entering thefood chain.Disintegration means that much of the plastic is too small to be seen. Moreover, plastic exposed to sunlight and in watering environments producegreenhouse gases,leading to further environmental impact.[46]

Effects on marine life[edit]

The2017 United Nations Ocean Conferenceestimated that the oceans might contain more weight in plastics than fish by the year 2050.[47]Some long-lasting plastics end up in the stomachs of marine animals.[48][49][50]Plastic attracts seabirds and fish. When marine life consumes plastic allowing it to enter the food chain, this can lead to greater problems when species that have consumed plastic are then eaten by other predators.

Animals can also become trapped in plastic nets and rings, which can cause death. Plastic pollution affects at least 700 marine species, including sea turtles, seals, seabirds, fish, whales, and dolphins.[51]Cetaceans have been sighted within the patch, which poses entanglement and ingestion risks to animals using the Great Pacific garbage patch as a migration corridor or core habitat.[52]

Plastic consumption[edit]

An exhibit at theMote Marine Laboratorythat displays plastic bags in the ocean that look similar tojellyfish.

With the increased amount of plastic in the ocean, living organisms are now at a greater risk of harm from plastic consumption and entanglement. Approximately 23% of aquatic mammals, and 36% of seabirds have experienced the detriments of plastic presence in the ocean.[53]Since as much as 70% of the trash is estimated to be on the ocean floor, andmicroplasticsare only millimeters wide, sealife at nearly every level of the food chain is affected.[54][55][56]Animals who feed off of the bottom of the ocean risk sweeping microplastics into their systems while gathering food.[57]Smaller marine life such as mussels and worms sometimes mistake plastic for their prey.[53][58]

Larger animals are also affected by plastic consumption because they feed on fish, and are indirectly consuming microplastics already trapped inside their prey.[57]Likewise, humans are also susceptible to microplastic consumption. People who eat seafood also eat some of the microplastics that were ingested by marine life. Oysters and clams are popular vehicles for human microplastic consumption.[57]Animals who are within the general vicinity of the water are also affected by the plastic in the ocean. Studies have shown 36% species of seabirds are consuming plastic because they mistake larger pieces of plastic for food.[53]Plastic can cause blockage of intestines as well as tearing of interior stomach and intestinal lining of marine life, ultimately leading to starvation and death.[53]

Entanglement[edit]

Not all marine life is affected by the consumption of plastic. Some instead find themselves tangled in larger pieces of garbage that cause just as much harm as the barely visible microplastics.[53]Trash that has the possibility of wrapping itself around a living organism may cause strangulation or drowning.[53]If the trash gets stuck around a ligament that is not vital for airflow, the ligament may grow with a malformation.[53]Plastic's existence in the ocean becomes cyclical because marine life that is killed by it ultimately decompose in the ocean, re-releasing the plastics into the ecosystem.[59][60]

Deposits on landmasses[edit]

Research in 2017[61]reported "the highest density of plastic rubbish anywhere in the world" on remote and uninhabitedHenderson Islandin South Pacific as a result of theSouth Pacific Gyre.The beaches contained an estimated 37.7 million items of debris together weighing 17.6 tonnes. In a studytransecton North Beach, each day 17 to 268 new items washed up on a 10-metre section.[62][63][64]

References[edit]

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