Meghan Hodges
The Arctic is a remote, sparsely populated region with little industry. However, pollution poses a serious threat to the people and wildlife that inhabit the area. The Arctic Ocean acts as a 'sink' for industrial and agricultural chemicals from Europe, Asia, and further afield, which are transported there by air and ocean currents. These pollutants include heavy metals, such as mercury and lead, and persistent organic pollutants (POPs), which evaporate into the air and accumulate in the food chain. Plastic pollution is also a significant issue in the Arctic, with microplastics being found in sea ice, snow, and wildlife. The impact of these pollutants on the sensitive Arctic ecosystems is a growing concern for researchers and authorities.
| Characteristics | Values |
|---|---|
| Main contaminants | Heavy metals, mercury, lead, persistent organic pollutants (POPs), DDT, PCBs, dioxins |
| How pollutants reach the Arctic | Airborne, ocean currents, plastic-laced snow, industrial and agricultural chemicals, plastic litter, fishing gear, household litter, food wrapping, bottles |
| Pollutant sources | Industrial processes, fossil fuel combustion, smelting, agricultural chemicals, plastic pollution, industrial chemicals |
| Arctic as an indicator | High concentrations of pollutants in the Arctic indicate the presence of known and new pollutants |
| Effects of pollution | Toxins stored in fatty tissue and organs of animals, potential impact on indigenous populations through consumption of contaminated prey, reduced visibility, perturbation of solar radiation budget, acidification and toxification of ecosystems |
| Plastic pollution | Microplastics found in sea ice, snow, and water across the Arctic, with particularly high concentrations in the Fram Strait |
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Plastic pollution
Local Sources
Local sources of plastic pollution in the Arctic include fisheries, landfills, wastewater, and offshore industrial activity. For instance, abandoned fishing nets and other gear can entangle marine life and even terrestrial mammals when washed ashore. As the Arctic ice melts, human activity in the region is increasing, with a notable rise in hydrocarbon exploration, tourist cruises, shipping, and fishing vessels. This surge in human activity contributes to the growing presence of plastics in the Arctic waters, whether through intentional or accidental dumping. Furthermore, inadequate waste management systems in some Arctic communities, such as open landfills on beaches and insufficient sewage treatment, exacerbate the problem by allowing unfiltered pollutants to enter the ocean.
Distant Sources
Distant sources of plastic pollution play a significant role in the Arctic's plastic woes. Ocean currents, atmospheric transport, and rivers carry plastic debris and microplastics from lower latitudes to the Arctic. The Fram Strait, a hub of ocean currents, exemplifies this issue, with extremely high concentrations of microplastics in the sea ice and snow. The Arctic's position at the end of these currents makes it a sink for buoyant plastics from highly populated regions. Additionally, the Arctic is susceptible to airborne microplastics, which are transported by winds from various directions and can travel vast distances in a short time.
Consequences
Addressing the Problem
Addressing plastic pollution in the Arctic requires a multi-faceted approach. At the local level, stricter regulations on plastic use, advocacy campaigns, and improved waste management systems are crucial. Simultaneously, global efforts are needed to incentivize major plastic-producing regions and multinational companies to reduce plastic production and improve waste management practices. The Arctic Council and World Economic Forum are actively exploring solutions, and the development of an ambitious regional plan of action on marine litter and plastics in the Arctic is underway.
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Chemical pollution
The Arctic's cold temperatures and ice-bound environment exacerbate the problem by trapping toxins, which are then released into the sea and rivers when the ice melts in the summer. This has led to high concentrations of pollutants in the Arctic environment, including in the air, soil, snow, seawater, and freshwater. These toxins have been detected not only in the environment but also in birds, mammals, and people, with particularly high levels found in top predators such as polar bears, seals, and whales.
The impact of chemical pollution on the food chain is a significant concern. Planktonic microorganisms ingest the toxins, which are then passed on to the fish that eat them and up the food chain to larger wildlife. Indigenous people in the Arctic who hunt these animals as part of their traditional diet are exposed to high levels of contaminants, which can have harmful effects on human development, reproduction, hormone function, and immune system strength.
In addition to POPs, the Arctic is also facing the issue of acidification due to pollutants. The increase in acidic pollutants, such as SO2 and NOx emissions, has led to a reduction in visibility and a perturbation of the solar radiation budget in April–June. This, in turn, can lead to the acidification and toxification of sensitive ecosystems, further threatening the already fragile Arctic environment.
While some progress has been made in reducing certain pollutants, such as lead, through source controls, other pollutants, like mercury, are increasing due to global human activities. The complex and varied pathways by which these chemicals enter and move within the Arctic make it a challenging issue to address. However, ongoing research and monitoring efforts are helping to improve our understanding of this complex problem, with the hope of informing effective solutions to protect the Arctic and its inhabitants from the harmful effects of chemical pollution.
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Air pollution
During the winter months, from December to April, the Arctic air mass is particularly affected by man-made mid-latitudinal emissions. These emissions arise from fossil fuel combustion, smelting, and industrial processes. The Arctic air mass covers a large area, including much of Eurasia and North America, and the inefficient removal of pollutants during this period contributes to the region's pollution levels.
The Arctic Ocean basin acts as a reservoir or "sink" for industrial and agricultural chemicals from Europe, Asia, and other parts of the world. These chemicals are transported through the air and ocean currents, as well as rivers and ice within the Arctic itself. The cold temperatures and ice-bound environment of the Arctic cause these toxins to degrade slowly, and they become trapped in the ground, air, water, and ice. As the ice melts during the summer, the toxins are released into the sea and rivers, posing a significant threat to the region's marine life and ecosystems.
Persistent organic pollutants (POPs) are of particular concern in the Arctic. These include substances like DDT, PCBs, and dioxins, which evaporate into the air but degrade slowly. POPs accumulate in the fatty tissue of Arctic animals, which rely on fat stores for insulation against the cold. As a result, these pollutants move up the food chain, affecting top predators like polar bears, seals, and whales. The Indigenous people of the Arctic who consume these animals as part of their traditional diet are also exposed to high levels of toxins, which can have detrimental effects on their health.
In addition to POPs, heavy metals such as mercury and lead are also present in the Arctic atmosphere. Mercury loadings, in particular, appear to be increasing due to global human activities, although the pathways and distribution of these metals are not yet fully understood. The long-range transport of pollution on hemispheric to global scales is causing widespread damage to the sensitive ecosystems of the Arctic.
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Water pollution
The Arctic's fragile freshwater ecosystems, including streams, rivers, lakes, and wetlands, are particularly vulnerable to the uptake of pollutants, which become trapped in the water and sediments for extended periods. The chemical composition of these freshwater ecosystems is influenced by various factors, including the surrounding landscape, vegetation, and hydrological features. The accumulation of pollutants in these ecosystems has the potential to affect their evolution and the health of both animals and humans.
Microplastics, primarily synthetic clothing fibers, have also been found to pervasively pollute Arctic seawater. These microplastics are believed to originate from Europe and North America, transported by ocean currents. Plastic litter, including discarded fishing gear, household litter, food wrapping, and bottles, has been discovered in the Arctic, further contributing to the region's water pollution problem.
The impact of water pollution in the Arctic is far-reaching. It affects the ecological system of the region, with potential effects including the acidification and toxification of sensitive ecosystems. The Arctic ecosystem is highly sensitive to pollution, and the current state of pollution intensity has led to an increased accumulation of pollutants in marine waters. This has the potential to harm marine life, such as phytoplankton, zooplankton, fish, seabirds, and marine mammals, as well as larger animals like turtles, albatross, seals, and whales.
Addressing water pollution in the Arctic requires global efforts to reduce emissions and pollutants concentration levels. Countries are striving to decrease the use of potentially toxic chemicals that may negatively impact freshwater ecosystems and human health. Additionally, research is being conducted to understand the effects of emerging chemicals on people and wildlife, as well as to develop potential solutions to mitigate the impacts of water pollution in this vulnerable region.
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Soil pollution
One of the significant contributors to soil pollution in the Arctic is persistent organic pollutants (POPs). POPs include toxic chemicals such as polychlorinated biphenyls (PCBs), dichlorodiphenyltrichloroethane (DDT), and dioxins. These pollutants have a slow degradation rate and can evaporate into the air. They are transported over long distances and accumulate in the Arctic environment, particularly in the soil and snowpack. The presence of POPs in the Arctic soil poses a risk to the local ecosystem, as they can be absorbed by plants and microorganisms, eventually making their way up the food chain.
Heavy metals, such as mercury and lead, are also prevalent in the Arctic soil. These contaminants originate from various human activities, including industrial processes and fossil fuel combustion. Mercury, in particular, is a significant concern due to its increasing loadings in the Arctic as a result of global human activities. Heavy metals can bioaccumulate in the food chain, impacting the health of wildlife and indigenous people who depend on hunting for sustenance.
In addition to POPs and heavy metals, plastic pollution is a growing concern in the Arctic. The region is experiencing an influx of plastic litter, including discarded fishing gear, household litter, and food packaging from Europe and other parts of the world. As plastic pollution breaks down, microplastics can contaminate the soil and impact the health of organisms that ingest them. The impact of plastic pollution in the Arctic is exacerbated by the region's unique characteristics, such as the extended period of snow cover, which can increase the persistence of plastic pollutants in the environment.
Climate change is also contributing to the soil pollution challenge in the Arctic. The region is warming at a faster rate than the global average, leading to permafrost thaw and coastal erosion. As permafrost thaws, previously frozen pollutants can be released into the environment, impacting the soil and water quality. Additionally, increased marine shipping as a result of melting sea ice exposes the Arctic to a higher risk of pollution, including oil spills and invasive species.
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Frequently asked questions
Pollution travels to the Arctic via ocean currents, rivers, ice, and the atmosphere.
Persistent organic pollutants (POPs) such as DDT, PCBs, and dioxins are a significant issue in the Arctic. Other pollutants include heavy metals like mercury and lead, as well as plastic pollution.
POPs accumulate in the fatty tissue of animals and are released when the animal is starving, affecting their hormone, vitamin, enzyme, and immune systems. As these toxins move up the food chain, they impact top predators like polar bears, seals, and whales, as well as indigenous people who hunt these animals for food.
The sources of pollution in the Arctic are traced back to industrialised and densely populated parts of the world, including Europe, Asia, and further afield.
Efforts to address pollution in the Arctic include research, regulation, and pollution monitoring. For example, the Arctic Monitoring and Assessment Programme (AMAP) published a report on chemicals of concern in the Arctic, and countries like Norway have implemented successful plastic bottle recycling schemes.
