Ultraviolet Radiation and Aquatic Microbial Ecosystems

  • Donat-P. Häder


Solar ultraviolet radiation is easily blocked by high concentrations of dissolved and particulate organic matter, but it has been found to penetrate to ecologically significant depths in clear freshwater and marine ecosystems (USEPA 1987; Smith et al. 1992; Scully and Lean 1994; Häder 1995a; Booth et al. 1997; Coohill, Häder and Mitchell 1996). The Antarctic ozone hole has continued to grow in size and depth, and measurements during the past few years have shown dramatic stratospheric ozone depletion also over the North Pole. At high and midlatitudes, moderate decreases in total ozone column have been found with resulting increases in erythemally weighted surface UV radiation of about 7% over the midlatitudes of the Northern Hemisphere in winter and spring and about 4% in summer and fall as compared with the values of 1970. For the Southern Hemisphere midlatitudes, an erythemally weighted increase in surface solar UV of about 6% has been determined on a year-round basis (Madronich et al. 1998).


Aquatic Ecosystem Ultraviolet Radiation Ozone Depletion Total Ozone Column Solar Ultraviolet Radiation 
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© Springer Science+Business Media New York 2001

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  • Donat-P. Häder

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