Biological weighting function for the inhibition of phytoplankton photosynthesis by ultraviolet radiation
In: Science, Jg. 258 (1992-10-23), Heft 5082
Online
report
Severe reduction of stratospheric ozone over Antarctica has focused increasing concern on the biological effects of ultraviolet-B (UVB) radiation (280 to 320 nanometers). Measurements of photosynthesis from an experimental system, in which phytoplankton are exposed to a broad range of irradiance treatments, are fit to an analytical model to provide the spectral biological weighting function that can be used to predict the short-term effects of ozone depletion on aquatic photosynthesis. Results show that UVA (320 to 400 nanometers) significantly inhibits the photosynthesis of a marine diatom and a dinoflagellate, and that the effects of UVB are even more severe. Application of the model suggests that the Antarctic ozone hole might reduce near-surface photosynthesis by 12 to 15 percent, but less so at depth. The experimental system makes possible routine estimation of spectral weightings for natural phytoplankton.
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Biological weighting function for the inhibition of phytoplankton photosynthesis by ultraviolet radiation
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Autor/in / Beteiligte Person: | Cullen, John J ; Neale, Patrick J ; Lesser, Michael P |
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Zeitschrift: | Science, Jg. 258 (1992-10-23), Heft 5082 |
Veröffentlichung: | United States: NASA Center for Aerospace Information (CASI), 1992 |
Medientyp: | report |
ISSN: | 0036-8075 (print) |
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