期刊
ANTARCTIC SCIENCE
卷 31, 期 4, 页码 169-188出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0954102019000178
关键词
deglaciation; hydrology; lake origin; lake typology; landscape evolution; water chemistry
资金
- Czech Science Foundation [16-17346Y]
- Agencia Nacional de Promocion Cientifica y Tecnologica project [PICTO-2010-0096]
- Grant Agency of Masaryk University [MUNI/A/1251/2017]
- Ministry of Education, Youth and Sports of the Czech Republic [LM2015078, CZ.02.1.01/0.0/0.0/16_013/0001708]
- 'Nadace Nadani Josefa, Marie a Zdeky Hlavkovych' Foundation
- Charles University Mobility Fund
- Charles University Grant Agency (GAUK) [126715]
- Charles University Research Centre program [204069]
- Polar Geospatial Center under NSF-OPP awards [1543501, 1810976, 1542736, 1559691, 1043681, 1541332, 0753663, 1548562, 1238993]
- NASA [NNX10AN61G]
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1543501, 0753663] Funding Source: National Science Foundation
Lentic freshwater habitats are important centres of biodiversity within the infrequent ice-free oases across Antarctica. Given imminent climate changes, it is crucial to catalogue these habitats in order to provide baseline data for future monitoring and biological surveys. The lacustrine systems of Clearwater Mesa, a previously unexplored part of James Ross Island, north-eastern Antarctic Peninsula, are described here. We conducted basic geomorphological and limnological surveys over three Antarctic summers (2009-16) to characterize landscape evolution, infer the origin of lake basins and assess the variability in their water chemistry. Stable shallow lakes, formed in depressions between lava tumuli following the last deglaciation, were found to dominate the volcanic mesa, although several peripheral lakes in ice-proximal settings appear to have formed recently as a result of post-Neoglacial ice recession. We found large heterogeneity in conductivity (similar to 10-7000 mu S cm(-1)), despite the lithologically uniform substrate. This variability was shown to be related to lake type, basin type (open vs closed), meltwater source and proximity to the coast. Inter-annual differences were attributed to changes in sea spray influx and snow accumulation driven by variable weather conditions. Overall, the ion composition of lakes suggested that sea spray was the dominant source of ions, followed by the weathering of bedrock.
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