Sources of solutes and carbon cycling in perennially ice-covered Lake Untersee, Antarctica

Perennially ice-covered lakes that host benthic microbial ecosystems are present in many regions of Antarctica. Lake Untersee is an ultra-oligotrophic lake that is substantially different from any other lakes on the continent as it does not develop a seasonal moat and therefore shares similarities t...

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Bibliographic Details
Published in:Scientific reports 2020-07, Vol.10 (1), p.12290-12290, Article 12290
Main Authors: Marsh, Nicole B., Lacelle, Denis, Faucher, Benoit, Cotroneo, Sarina, Jasperse, Liam, Clark, Ian D., Andersen, Dale T.
Format: Article
Language:English
Subjects:
704/106/125
704/286
704/47
Calcium
Carbon
Carbon cycle
Carbon dioxide
Carbon sources
Fractionation
Gases
Geochemistry
Glacial lakes
Humanities and Social Sciences
Ice
Lakes
Meltwater
Microbial mats
multidisciplinary
Oligotrophic lakes
Science
Science (multidisciplinary)
Solutes
Water column
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Summary:Perennially ice-covered lakes that host benthic microbial ecosystems are present in many regions of Antarctica. Lake Untersee is an ultra-oligotrophic lake that is substantially different from any other lakes on the continent as it does not develop a seasonal moat and therefore shares similarities to sub-glacial lakes where they are sealed to the atmosphere. Here, we determine the source of major solutes and carbon to Lake Untersee, evaluate the carbon cycling and assess the metabolic functioning of microbial mats using an isotope geochemistry approach. The findings suggest that the glacial meltwater recharging the closed-basin and well-sealed Lake Untersee largely determines the major solute chemistry of the oxic water column with plagioclase and alumino-silicate weathering contributing
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-69116-6