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Science 21 February 1992:
Vol. 255. no. 5047, pp. 952 - 959
DOI: 10.1126/science.1546292
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Articles

Science, Vol 255, Issue 5047, 952-959
Copyright © 1992 by American Association for the Advancement of Science

articles

Ozone depletion: ultraviolet radiation and phytoplankton biology in antarctic waters

RC Smith, BB Prezelin, KS Baker, RR Bidigare, NP Boucher, T Coley, D Karentz, S MacIntyre, HA Matlick, D Menzies, and al. et

Department of Geography, University of California, Santa Barbara 93106.

The springtime stratospheric ozone (O3) layer over the Antarctic is thinning by as much as 50 percent, resulting in increased midultraviolet (UVB) radiation reaching the surface of the Southern Ocean. There is concern that phytoplankton communities confined to near-surface waters of the marginal ice zone will be harmed by increased UVB irradiance penetrating the ocean surface, thereby altering the dynamics of Antarctic marine ecosystems. Results from a 6-week cruise (Icecolors) in the marginal ice zone of the Bellingshausen Sea in austral spring of 1990 indicated that as the O3 layer thinned: (i) sea surface- and depth-dependent ratios of UVB irradiance (280 to 320 nanometers) to total irradiance (280 to 700 nanometers) increased and (ii) UVB inhibition of photosynthesis increased. These and other Icecolors findings suggest that O3-dependent shifts of in-water spectral irradiances alter the balance of spectrally dependent phytoplankton processes, including photoinhibition, photoreactivation, photoprotection, and photosynthesis. A minimum 6 to 12 percent reduction in primary production associated with O3 depletion was estimated for the duration of the cruise.


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