Transparency of Antarctic ice-covered lakes to solar UV radiation
Depth profiles of solar ultraviolet radiation (UVR), photosynthetically available radiation (PAR), and related variables were measured beneath the thick, permanent ice cover of four lakes in the McMurdo Dry Valleys (77’S, 162”E). These lakes span a range of phytoplankton c centrations (0.1-10 pg Chl...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.517.1247 2023-05-15T13:56:38+02:00 Transparency of Antarctic ice-covered lakes to solar UV radiation Warwick F. Vincent Rowena Rae Isabelle Laurion John C. Priscu The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.1247 http://www.aslo.org/lo/toc/vol_43/issue_4/0618.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.1247 http://www.aslo.org/lo/toc/vol_43/issue_4/0618.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.aslo.org/lo/toc/vol_43/issue_4/0618.pdf text ftciteseerx 2016-01-08T09:55:13Z Depth profiles of solar ultraviolet radiation (UVR), photosynthetically available radiation (PAR), and related variables were measured beneath the thick, permanent ice cover of four lakes in the McMurdo Dry Valleys (77’S, 162”E). These lakes span a range of phytoplankton c centrations (0.1-10 pg Chl a liter-l) butreceive little input of chromophoric dissolved organic matter (CDOM) from their barren, polar desert catchments. The diffuse atten-uation coefficients fordownwelling radiation (K,) in the upper water column of the lakes were at or below those for clear natural waters elsewhere, with minimum values in Lake Vanda of 0.080 (305 nm), 0.055 (320 nm), 0.036 (340 nm), 0.023 (380 nm) and 0.034 (PAR) m-l. The attenuation lengths (l/K,) for these lakes and for a set of high latitude lakes in the northern hemisphere (tundra nd boreal forest catchments) showed a close log-log rela-tionship with dissolved organic arbon (DOC) concentrations (r * L 0.90; n = 20); dry valley lakes were at the high transparency end of this polar-subpolar continuum. Phytoplankton exposure to UVR relative toPAR is known to rise steeply with decreasing DOC in the concentration range 2-4 g m-3; the addition of the dry valley lakes data shows the continuation of this upward, markedly nonlinear t end at lower DOC concentrations. Calculation of the biologically effective UVR dosage rate for the upper phytoplankton community of Lake Vanda indicated that sufficient UVR penetrates hrough the 3.5-m-thick la e ice to cause inhibition of algal growth. These results show Text Antarc* Antarctic McMurdo Dry Valleys polar desert Tundra Unknown Antarctic Four Lakes ENVELOPE(-126.826,-126.826,54.858,54.858) Lake Vanda ENVELOPE(161.600,161.600,-77.517,-77.517) McMurdo Dry Valleys Vanda ENVELOPE(161.550,161.550,-77.533,-77.533) |
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Open Polar |
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Unknown |
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ftciteseerx |
language |
English |
description |
Depth profiles of solar ultraviolet radiation (UVR), photosynthetically available radiation (PAR), and related variables were measured beneath the thick, permanent ice cover of four lakes in the McMurdo Dry Valleys (77’S, 162”E). These lakes span a range of phytoplankton c centrations (0.1-10 pg Chl a liter-l) butreceive little input of chromophoric dissolved organic matter (CDOM) from their barren, polar desert catchments. The diffuse atten-uation coefficients fordownwelling radiation (K,) in the upper water column of the lakes were at or below those for clear natural waters elsewhere, with minimum values in Lake Vanda of 0.080 (305 nm), 0.055 (320 nm), 0.036 (340 nm), 0.023 (380 nm) and 0.034 (PAR) m-l. The attenuation lengths (l/K,) for these lakes and for a set of high latitude lakes in the northern hemisphere (tundra nd boreal forest catchments) showed a close log-log rela-tionship with dissolved organic arbon (DOC) concentrations (r * L 0.90; n = 20); dry valley lakes were at the high transparency end of this polar-subpolar continuum. Phytoplankton exposure to UVR relative toPAR is known to rise steeply with decreasing DOC in the concentration range 2-4 g m-3; the addition of the dry valley lakes data shows the continuation of this upward, markedly nonlinear t end at lower DOC concentrations. Calculation of the biologically effective UVR dosage rate for the upper phytoplankton community of Lake Vanda indicated that sufficient UVR penetrates hrough the 3.5-m-thick la e ice to cause inhibition of algal growth. These results show |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Warwick F. Vincent Rowena Rae Isabelle Laurion John C. Priscu |
spellingShingle |
Warwick F. Vincent Rowena Rae Isabelle Laurion John C. Priscu Transparency of Antarctic ice-covered lakes to solar UV radiation |
author_facet |
Warwick F. Vincent Rowena Rae Isabelle Laurion John C. Priscu |
author_sort |
Warwick F. Vincent |
title |
Transparency of Antarctic ice-covered lakes to solar UV radiation |
title_short |
Transparency of Antarctic ice-covered lakes to solar UV radiation |
title_full |
Transparency of Antarctic ice-covered lakes to solar UV radiation |
title_fullStr |
Transparency of Antarctic ice-covered lakes to solar UV radiation |
title_full_unstemmed |
Transparency of Antarctic ice-covered lakes to solar UV radiation |
title_sort |
transparency of antarctic ice-covered lakes to solar uv radiation |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.1247 http://www.aslo.org/lo/toc/vol_43/issue_4/0618.pdf |
long_lat |
ENVELOPE(-126.826,-126.826,54.858,54.858) ENVELOPE(161.600,161.600,-77.517,-77.517) ENVELOPE(161.550,161.550,-77.533,-77.533) |
geographic |
Antarctic Four Lakes Lake Vanda McMurdo Dry Valleys Vanda |
geographic_facet |
Antarctic Four Lakes Lake Vanda McMurdo Dry Valleys Vanda |
genre |
Antarc* Antarctic McMurdo Dry Valleys polar desert Tundra |
genre_facet |
Antarc* Antarctic McMurdo Dry Valleys polar desert Tundra |
op_source |
http://www.aslo.org/lo/toc/vol_43/issue_4/0618.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.517.1247 http://www.aslo.org/lo/toc/vol_43/issue_4/0618.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766264177063624704 |