Priority Pollutants of the Arctic Territories презентация

state of the biosphere and chemical pollution of the Arctic ecosystems.
Sources, types and pathways of chemical pollution will be discussed.

region.
• The main sources of pollution of Arctic ecosystems.
• Tracks of major pollutants.

2 . Heavy metals as the pollutants of Arctic Region.
• The main sources of heavy metals in the Arctic.
• Atmospheric emissions and geochemical cycles of heavy metals.
• Transformation forms of heavy metals.

3. Persistent organic pollutants (POPs).
• Physical and chemical characteristics of POPs.
• The main sources of POPs in the Arctic.
• Pathways of POPs in the Arctic.

4. Radionuclides in the Arctic.
• The main sources of radionuclides.
• Impact on the environment and biota.

of lab reports or field reports.
Final certification is the multilevel test in the 2nd semester of the master degree.

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Arctic Circle (66°32'N), which approximates the southern boundary of the midnight sun.
Environmental contaminants are a global problem. Their presence and role in the Arctic reflects the physical, biological, and social characteristics of the region, as well as the way the Arctic interacts with the rest of the world.

large seasonal fluctuations in incoming solar radiation, extensive snow and ice cover, and short growing seasons.
The Arctic region also includes the tundra — meaning “treeless plain”— ecosystem.
One defining characteristic of the arctic tundra is its permafrost, permanently frozen ground that occurs from several inches below the surface to depths of more than 1000 feet.

ecosystem surrounding the polar region, above roughly 60 degrees north latitude. The Arctic circle occurs at 66 degrees north latitude.

migration), and food chain characteristics of Arctic and subarctic ecosystems. These effects have implications on contaminant transfer and storage in Arctic biota, and on the sensitivity of Arctic ecosystems to contaminants and other stressors.

other stressors

1. Low productivity
Productivity in terrestrial, freshwater, and marine environments is reduced due to limited nutrient availability, low light, low temperatures, ice cover, and short growing seasons. The low productivity in the Arctic results in slower-growing and longer-lived poikilotherms than in temperate climates.

other stressors

2. Bioaccumulation and biomagnification
Levels of some contaminants, particularly metals, in specific tissues and organs of a number of temperate and Arctic species increase with age. This is due to bioaccumulation, i.e., increases in contaminant concentrations in biota with continued exposure over time.
Some organic contaminants become further concentrated in animals with each successive step up a food chain, a process called biomagnification.

other stressors

3. Cyclic annual productivity

Arctic ecosystems are highly cyclic due to seasonal fluctuations in light levels, nutrient inputs, and temperature.
Nutrients and contaminants deposited on snow, ice, soil, and plants during the Arctic winter can be mobilized and assimilated very quickly in the spring when sunlight returns and temperatures rise.
In freshwater systems, the spring melt carries nutrients and some contaminants into streams, ponds, and lakes.

other stressors

4. Low species diversity
The low species diversity in the Arctic is a consequence of low absolute productivity and recent glaciations. In contrast, the Antarctic marine environment which has not experienced such glaciations, has considerably higher biological diversity and an accompanying higher degree of specialization
The low diversity in the Arctic is associated with opportunistic and invading species that are adapted to survive successfully under a range of conditions.

haze
Ocean garbage and sewage
Invasive species
Noise
Ship strikes

for a number of the persistent organic pollutants (POPs); the main contaminants of concern are: organochlorine pesticides (e.g., HCH) and their metabolites from agricultural activities/ practices; industrial chemicals (e.g., PCBs); and anthropogenic and natural combustion products, e.g. chlorinated dioxins/furans and polycyclic aromatic hydrocarbons (PAHs).

decommissioned DEW (Distant Early Warning) Line sites in Canada, and dioxins/furans from smelters in Norway are examples of identified sources of POPs within the Arctic; other such sources probably exist but are presently unknown.
Two-thirds of heavy metals in air in the High Arctic originate from industrial activities on the Kola Peninsula, the Norilsk industrial complex, the Urals (outside the Arctic) and the Pechora Basin.
At point sources such as mine sites, heavy metals may exceed local background concentrations at distances up to 30 km from the site. Mineralization of geological formations provides significant, non-anthropogenic local inputs of heavy metals.

marine pathways which result in the long-range transport of contaminants into and within the Arctic. The Arctic is, therefore, a potential contaminant storage reservoir and/or sink. Various processes remove these contaminants from the atmosphere, oceans and rivers and make them available to plants and animals. Food chains are the major biological pathways for selective uptake, transfer, and sometimes magnification of contaminants by Arctic plants and animals, many of which are subsequently consumed by Arctic peoples.