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Structure and life cycle of supraglacial lakes in Dronning Maud Land

Published online by Cambridge University Press:  22 November 2012

Matti Leppäranta ,
Onni Järvinen  and
Olli-Pekka Mattila
Matti Leppäranta*
Affiliation:
Department of Physics, University of Helsinki, PO Box 48 (Erik Palménin Aukio 1), FI-00014 Helsinki, Finland
Onni Järvinen
Affiliation:
Department of Physics, University of Helsinki, PO Box 48 (Erik Palménin Aukio 1), FI-00014 Helsinki, Finland
Olli-Pekka Mattila
Affiliation:
Finnish Environment Institute, Helsinki, Finland
*
matti.lepparanta@helsinki.fi
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Abstract

Supraglacial lakes form in Antarctic blue ice regions from penetration of solar radiation into the ice in summer. Three lakes were mapped for their structure in summers 2004–05 and 2010–11 in western Dronning Maud Land, and one was also examined for the radiation budget. The lake body consisted of two layers, each ∼1 m thick: an upper layer with a thin ice layer on top and main body of liquid water, and a lower layer containing slush and hard ice sub-layers. A sediment-rich slush pocket was found at the bottom. Hydraulic conductivity of the lake body was 0.25–30 cm s-1 depending on the stage of evolution, with 6.3 cm s-1 for closely packed slush. Albedo of the lake was 0.4–0.6 and light attenuation coefficient was 0.5–0.7 m-1. The formation and the depth scale of the lakes are determined by the light attenuation distance and thermal diffusion coefficient, limiting the growth to less than about 1.5 m in one summer. The potential winter growth is more and thus the lakes freeze up in winter in the present climatic conditions.

Keywords

blue icelife historyporosityprofileradiation budget
Type
Physical Sciences
Information
Antarctic Science , Volume 25 , Issue 3 , June 2013 , pp. 457 - 467
Copyright
Copyright © Antarctic Science Ltd 2012 

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