期刊
ANTARCTIC SCIENCE
卷 33, 期 2, 页码 217-229出版社
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0954102021000018
关键词
Antarctica; hydroclimate; Little Ice Age; Ross Sea; water-balance
资金
- NSF [NSF-OPP 1246316]
- Boston University Undergraduate Research Opportunities Program
- Department of Earth & Environment at Boston University
- Boston University Research, Education, and Communication of Science Program - Howard Hughes Medical Institute
- NSF Graduate Research Fellowship
The study of Lake Eggers in Antarctica reveals that the lake is primarily fed by local snowmelt and has experienced alternating periods of ice accumulation and sublimation during the Late Holocene. The research suggests a strong climatic influence on the hydrologic regime shifts shaping ice formation at Lake Eggers.
Ice-covered lakes in Antarctica preserve records of regional hydroclimate and harbour extreme ecosystems that may serve as terrestrial analogues for exobiotic environments. Here, we examine the impacts of hydroclimate and landscape on the formation history of Lake Eggers, a small ice-sealed lake, located in the coastal polar desert of McMurdo Sound, Antarctica (78 degrees S). Using ground penetrating radar surveys and three lake ice cores we characterize the ice morphology and chemistry. Lake ice geochemistry indicates that Lake Eggers is fed primarily from local snowmelt that accreted onto the lake surface during runoff events. Radiocarbon ages of ice-encased algae suggest basal ice formed at least 735 +/- 20 calibrated years before present (1215 C.E.). Persisting through the Late Holocene, Lake Eggers alternated between periods of ice accumulation and sublimation driven by regional climate variability in the western Ross Sea. For example, particulate organic matter displayed varying delta N-15 ratios with depth, corresponding to sea ice fluctuations in the western Ross Sea during the Late Holocene. These results suggest a strong climatic control on the hydrologic regime shifts shaping ice formation at Lake Eggers.
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