Consequences of climate warming and lake acidification for UV-B penetration in North American boreal lakes
Article Abstract:
Climate warming and lake acidification decreases dissolved organic carbon (DOC) content in North American boreal lakes, thereby increasing the penetration of UV-B radiations. The DOC reductions are due to reduced export from terrestrial and wetland catchments to lakes. Acid deposition due to man-made emission of oxides of nitrogen and sulphur is the greatest danger to boreal lakes. Whole-lake acidification experiments were performed from 1971-90 in northwestern Ontario, Canada.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1996
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Accumulation of persistent organochlorine compounds in mountains of western Canada
Article Abstract:
Organo-chlorine deposition in snow from mountain ranges in western Canada showing a 10- to 100-fold increase between altitudes of 770 and 3,100 m, have been reported. cold-condensation effects further enhance the concentrations of more-volatile organochlorines, with increasing altitude. This shows that temperate-zone mountain regions with high precipitation levels close to pollutant sources, are particularly vulnerable to semivolatile organochlorine compound accumulation.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1998
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Past ultraviolet radiation environments in lakes derived from fossil pigments
Article Abstract:
Historical changes in the ultraviolet (UV) radiation environment of lakes can be assessed using specific fossil pigments in lake sediments. Exposure to UV radiation causes benthic algae to produce these pigments, which indicate sedimentary concentrations connected with the depth of penetration of UV radiation within lakes. Assessing pigments in lake sediments could be a valuable method of documenting the scope of changes in the penetration of UV radiation.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1997
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