The Arctic Ocean and Contaminants: Pathways That Lead to Us
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The Arctic Ocean has long been perceived as the last pristine bastion on the globe because it is isolated from industry and population by vast distances. Slowly we have become aware that the Arctic is not only firmly connected to the rest of the globe but that it is especially vulnerable to some of the contaminants being transported. Arctic haze was first noticed in the 1950s. A decade later organochlorine pesticide residues were found in arctic marine mammals. Surprisingly, it took more than another decade to discover elevated PCBs and toxaphene in humans. Five years of research under Canada’s Northern Contaminants Program followed by comprehensive international assessments of contamination in the Arctic have produced a clearer understanding of where contaminants are coming from, how they have been delivered and who they are aimed at. Two transporting fluids play a key role — the atmosphere and the ocean. However, it is specific biogeochemical pathways that deliver the unpleasant surprises. For many contaminants we have already “turned off the tap” but, unfortunately, the historical releases continue to cycle globally. In this chapter two very different types of contaminants, artificial radionuclides and organochlorines (OCs), are used to illustrate the importance of environmental pathways. These two contaminant classes have different, but effective, routes of transport into the Arctic Ocean. However, it is the organochlorines that pose the far greater risk to humans and ecosystems due to their interaction with ocean structure and the food web.
KeywordsArctic Ocean Former Soviet Union Canadian Basin Harbour Porpoise Artificial Radionuclide
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- Anonymous, 1995, Nuclear Wastes in the Arctic: An Analysis of Arctic and other Regional Impacts from Soviet Nuclear Contamination: Washington DC, United States Government.Google Scholar
- Braune, B., Muir, D., DeMarch, B., Gamberg, M., Poole, K., Currie, R., Dodd, M., Duschenko, W., Earner, J., Elkin, B., Evans, M., Grudny, S., Hebert, C, Johnstone, R., Kidd, K., Koenig, B., Lockhart, L., Marshall, H., Reimer, K., Sanderson, J., and Shutt, L., 1999, Spatial and temporal trends of contaminants in Canadian Arctic freshwater and terrestrial ecosystems: a review: The Science of the Total Environment, v. 230, p. 145-207.CrossRefGoogle Scholar
- Layton, D., Edson, R., Varela, M., and Napier, B.e., 1997, Radionuclides in the Arctic Seas from the Former Soviet Union: Potential Health and Ecological Risks, Arctic Nuclear Waste Assessment Program (ANWAP), Office of Naval Research (ONR).Google Scholar
- Macdonald, R.W., Barrie, L.A., Bidleman, T.F., Diamond, M.L., Gregor, D.J., Semkin, R.G., Strachan, W.M.J., Li, Y.F., Wania, F., Alaee, M., Alexeeva, L.B., Backus, S.M., Bailey, R., Bewers, J.M., Gobeil, C, Halsall, C.J., Harner, T., Hoff, J.T., Jantunen, L.M.M., Lockhart, W.L., Mackay, D., Muir, D.C.G., Pudykiewicz, J., Reimer, K.J., Smith, J.N., Stern, G.A., Schroeder, W.H., Wagemann, R., and Yunker, M.B., 2000a, Sources, occurrence and pathways of contaminants in the Canadian Arctic: A review: The Science of the Total Environment, v. in press.Google Scholar
- Macdonald, R.W., Eisenreich, S.J., Bidleman, T.F., Dachs, J., Pacyna, J., Jones, K., Bailey, B., Swackhamer, D., and Muir, D.C.G., 2000b, Case studies on persistence and long range transport of persistent organic pollutants, in Klecka, G., and Mackay, D., eds., Evaluation of persistence and long-range transport of organic chemicals in the environment: Pensacola, SETAC Press, In press.Google Scholar
- Macdonald, R.W., Paton, D.W., Carmack, E.C., and Omstedt, A., 1995, The freshwater budget and under-ice spreading of Mackenzie River water in the Canadian Beaufort Sea based on salinity and 18O/16O measurements in water and ice: Journal of Geophysical Research, v. 100, p. 895-919.CrossRefGoogle Scholar
- Muir, D., Braune, B., DeMarch, B., Norstrom, R., Wagemann, R., Lockhart, L., Hargrave, B., Bright, D., Addison, R., Payne, J., and Reimier, K., 1999, Spatial and temporal trends and effects of contaminants in teh Canadian Arctic marine ecosystem: a review: The Science of the Total Environment, v. 230, p. 83-144.CrossRefGoogle Scholar
- Muir, D.C.G., and Norstrom, R.J., 1994, Persistent organic contaminants in Arctic marine and freshwater ecosystems: Arctic Research, v. 8, p. 136-146.Google Scholar
- van Oostdam, J., Gilman, A., Dewailly, E., Usher, P., Wheatley, B., Kuhnlein, H., Neve, S., Walker, J., Tracy, B., Feeley, M., Jerome, V., and Kwavnick, B., 1999, Human health implications of environmental contaminants in Arctic Canada: a review: The Science of the Total Environment, v. 230, p. 1-82.CrossRefGoogle Scholar
- Wilson, J.S., Murray, J.L., and Huntington, H.P., 1998, AMAP Assessment Report: Arctic Pollution Issues: Oslo, Norway, Arctic Monitoring and Assessment Programme, p. 859.Google Scholar