Licht-im-Terrarium: Literaturdatenbank
Licht-im-Terrarium: Literaturdatenbank |
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Sommaruga, R., & Psenner, R. (1997). Ultraviolet radiation in a high mountain lake of the austrian alps: Air and underwater measurements. Photochemistry and Photobiology, 65(6), 957–963. Added by: Sarina (2012-01-24 11:36:32) |
| Resource type: Journal Article DOI: 10.1111/j.1751-1097.1997.tb07954.x ID no. (ISBN etc.): 1751-1097 BibTeX citation key: Sommaruga1997 View all bibliographic details  |
Categories: Englisch = English Keywords: Sonne = Sun, Spektrum = Spectrum, Ultraviolett = Ultraviolet Creators: Psenner, Sommaruga Collection: Photochemistry and Photobiology |
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| Abstract |
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Global UV radiation was measured with a portable multichannel filter radiometer at the surface and underwater in a high mountain lake (2417 m above sea level) of the Austrian Alps during 16 days in summer 1995. During this period, total column ozone values that changed only by 34 Dobson units explained a significant part of the variability in UVB radiation at 305 nm as indicated by the negative correlation with the ratio 305:340 nm (rs= -0.810, P < 0.01). High radiation at the surface combined with high water transparency allowed substantial UVB radiation to reach the bottom of this lake. The diffuse attenuation coefficient for downward irradiance at 305 nm changed within 2 weeks from 0.24 m-1 (10% at 9.6 m depth) to 0.32 m-1 (10% at 7.2 m depth). This change in attenuation was related to the development of phytoplankton after the ice break-up as indicated by a six-fold increase in chlorophyll-a concentrations during this period. Our results suggest that phytoplankton and/ or phytoplankton-derived organic substances are important for the UV attenuation in this oligotrophic lake.
Added by: Sarina |