气候变化领域集成服务门户(CCPortal): Ice Sheet Changes and GIA-Induced Surface Displacement of the Larsemann Hills During the Last 50 kyr

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DOI	10.1029/2020JB020167
	Ice Sheet Changes and GIA-Induced Surface Displacement of the Larsemann Hills During the Last 50 kyr
	Gao Y.; Yang L.; Mei Y.; Chu Z.; Yang W.; Xu Q.; Chen G.; Xie Z.; Sun L.
发表日期	2020
ISSN	21699313
卷号	125 期号:10
英文摘要	The Antarctic Ice Sheet (AIS) is the largest potential source for future global sea level rise. However, there are widely diverging estimates of its contribution, which emphasizes the need to improve our understanding of the long-term behavior of the AIS and its impact on the solid Earth. This knowledge gap results from a shortage of records of glacial history, especially for the pre-Holocene. Marine transgression and recession in the coastal areas of Antarctica are influenced by the mass of the overlying ice, providing crucial information about regional ice sheet dynamics. In this study, we determined a marine transgression from 53 kyr BP onward by diatom assemblages and a δ13C-C/N biplot for the organic component in a sediment core (MCM2), from the Larsemann Hills in East Antarctica. Relative sea level (RSL) reached a maximum of ~12 m a.p.s.l. (above present sea level) during 38–29 kyr BP. Concurrent with the transgression, the regional crust experienced glacial-isostatic-adjustment (GIA)-induced subsidence from ~75 to ~95 m beneath the present land level, suggesting an expansion trend of the East Antarctic ice sheet (EAIS), which may have outpaced global cooling. After the last deglaciation, the RSL rose to a highstand of ~8–10 m a.p.s.l. at ~8.5–7.1 kyr BP, when the bedrock uplifted to ~20 m below the present level. After 4.0 kyr BP, both regional and global deglaciation ceased, but an effect of ongoing relaxation caused the land to rebound continuously at a uniform rate of ~1.5 m/kyr, which can account for the sustained fall of RSL across Antarctica since mid-Holocene. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	East Antarctica; glacial isostatic adjustment; Larsemann Hills; marine isotope stage 3; marine transgression; relative sea level
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187554
作者单位	Institute of Polar Environment and Anhui Key Laboratory of Polar Environment and Global Change, Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, China; State Key Laboratory of Estuarine and Coastal Research, School of Marine Sciences, East China Normal University, Shanghai, China; Yunnan Key Laboratory of Plateau Geographical Processes and Environment Change, School of Tourism and Geography, Yunnan Normal University, Kunming, China
推荐引用方式 GB/T 7714	Gao Y.,Yang L.,Mei Y.,et al. Ice Sheet Changes and GIA-Induced Surface Displacement of the Larsemann Hills During the Last 50 kyr[J],2020,125(10).
APA	Gao Y..,Yang L..,Mei Y..,Chu Z..,Yang W..,...&Sun L..(2020).Ice Sheet Changes and GIA-Induced Surface Displacement of the Larsemann Hills During the Last 50 kyr.Journal of Geophysical Research: Solid Earth,125(10).
MLA	Gao Y.,et al."Ice Sheet Changes and GIA-Induced Surface Displacement of the Larsemann Hills During the Last 50 kyr".Journal of Geophysical Research: Solid Earth 125.10(2020).