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Late Quaternary deglacial history across the Larsen B embayment, Antarctica

Cited 3 time in wos
Cited 4 time in scopus
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Late Quaternary deglacial history across the Larsen B embayment, Antarctica
Other Titles
남극 라슨B 지역의 후기 제4기 해빙 역사
Jeong, Ara
Il Lee, Jae
Seong, Yeong Bae
Balco, Greg
Yoo, Kyu-Cheul
Yoon, Ho Il
Domack, Eugene
Rhee, Hyun Hee
Yu, Byung Yong
Physical Geography; Geology
Antarctica; Cosmogenic isotopes; Deglaciation; Glacial geomorphology; Glaciation; Larsen ice shelf; Meteoric Be-10; Quaternary; In-situ C-14
Issue Date
Ara Jeong, et al. 2018. "Late Quaternary deglacial history across the Larsen B embayment, Antarctica". QUATERNARY SCIENCE REVIEWS, 189(1): 134-148.
We measured meteoric 10Be variation throughout a marine sediment core from the Larsen B embayment (LBE) of the Antarctic Peninsula, and collected in situ 10Be and 14C exposure ages on terrestrial glacial deposits from the northern and southern margins of the LBE. We use these data to reconstruct Last Glacial Maximum (LGM) to present deglaciation and ice shelf change in the LBE. Core sedimentary facies and meteoric 10Be data show a monotonic progression from subglacial deposits to sub-ice-shelf deposits to open-marine conditions, indicating that its collapse in 2002 was unprecedented since the LGM. Exposure-age data from the southern LBE indicate 40m of ice surface lowering between 14 and 6 ka, then little change between 6 ka and the 2002 collapse. Exposure-age data from the northern LBE show a bimodal distribution in which clusters of apparent exposure ages in the ranges 4.9e5.1 ka and 1.0e2.0 ka coexist near 50m elevation. Based on these results, other published terrestrial and marine deglaciation ages, and a compilation of sea bed imagery, we suggest a north-to-south progression of deglaciation in the northeast Antarctic Peninsula in response to Holocene atmospheric and oceanic warming. We argue that local topography and ice configuration inherited from the LGM, in addition to climate change, are important in controlling the deglaciation history in this region.
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