Transparency of Antarctic ice-covered lakes to solar UV radiation
Article Abstract:
Polar desert lakes such as four lakes studied in the McMurdo Dry Valleys of Antarctica represent a global extreme in water-column transparency to ultraviolet radiation (UVR). The chromophoric dissolved organic matter (CDOM) in these lakes is dilute, mostly autochthonous and provides little protection from the increasing ultraviolet-B radiation over polar regions. Enough UVR passes through lake ice 3.5-m thick to inhibit algal growth.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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Seasonal change in the optical properties of the permanent ice cover on Lake Bonney, Antarctica: consequences for lake productivity and phytoplankton dynamics
Article Abstract:
The presence of permanent ice covers control the geophysical and ecological dynamics in lakes of the McMurdo Dry Valleys, Antarctica. The specific couplings between changes in the geophysical properties of the ice covers and ecological processes in the underlying water column have been neglected by limnological research. Ice whitening is caused by changes in the upper meter of the ice column, and affects phytoplankton dynamics.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1999
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Evidence of deep circulation in two perennially ice-covered Antarctic lakes
Article Abstract:
Evidence has been found of deep mixing in two perennially ice-covered Antarctic lakes in the McMurdo Dry Valley region. Chlorofluorocarbon CFC-113 was found in the bottom waters of Lake Fryxell. Lake Hoare had CFCs present throughout the water column, with indications of vertical mixing times between 20 and 30 years. Both lakes had CFC concentrations well above saturation near the ice-water interface.
Publication Name: Limnology and Oceanography
Subject: Earth sciences
ISSN: 0024-3590
Year: 1998
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