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Widespread persistence of expanded East Antarctic glaciers in the southwest Ross Sea during the last deglaciation

Cited 3 time in scopus
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Title
Widespread persistence of expanded East Antarctic glaciers in the southwest Ross Sea during the last deglaciation
Other Titles
지난 해빙기 동안 남서 로스 해 내 광범위하게 지속된 동남극의 확장 빙하들
Authors
Lee, Jae Il
Hong, Jong Kuk
Kim, Hyung J.
Yoo, Kyu-Cheul
Yoon, Ho Il
N. R. Golledge
R. M. McKay
Subject
Geology
Keywords
Ross Sea; glacial retreat; last deglaciation; multibeam
Issue Date
2017
Citation
Lee, Jae Il, et al. 2017. "Widespread persistence of expanded East Antarctic glaciers in the southwest Ross Sea during the last deglaciation". GEOLOGY, 45(5): 403-406.
Abstract
It has been suggested that the grounding line of the Last Glacial Maximum (LGM) ice sheet in the Ross Sea, Antarctica, receded in an approximately north-to-south pattern during the Holocene. An implication of this hypothesis is that geological evidence from the southwestern Ross Sea has been used widely to interpret retreat histories of the West Antarctic Ice Sheet (WAIS) across the wider Ross Sea embayment. Accurately constraining the timing and pattern of marine-based ice sheet retreat in this embayment is critical to understanding the drivers that may have triggered this event, and its contribution to rapid sea-level rise events. Here, we present new multibeam swath bathymetry data that identifies well-preserved glacial features indicating that thick (>700 m) marine-based ice derived from the East Antarctic Ice Sheet coastal outlet glaciers dominated the ice sheet input into the southwestern Ross Sea during the last phases of glaciation. Subglacial geomorphic features indicate that ice derived from present outlet glacier valleys in South Victoria Land flowed southeastward. This is more consistent with flowlines from model-based interpretations of an earlier retreat of the WAIS in the central Ross Sea than with previous land-based geological reconstructions. This implies that coastal records of deglaciation along the Transantarctic Mountains front record only the final phases of glacial retreat in the Ross Sea. Therefore, chronological data from the central embayment are required to accurately constrain the timing of large-scale glacial retreat in the Ross Sea and to identify the mechanisms that drove it.
URI
http://repository.kopri.re.kr/handle/201206/6085
DOI
http://dx.doi.org/10.1130/G38715.1
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