Dynamic response of East Antarctic ice sheet to Late Pleistocene glacial–interglacial climatic forcing

Ge，Shulan1,2; Chen，Zhihua1,2; Liu，Qingsong2,3; Wu，Li4; Zhong，Yi3; Liu，Helin1; Liu，Jianxing1,2; Zhang，Qiang3

2022-02-01

10.1016/j.quascirev.2021.107299

QUATERNARY SCIENCE REVIEWS   影响因子和分区

0277-3791

1873-457X

Knowledge regarding the response of the East Antarctic Ice Sheet to glacial–interglacial climatic cycles in the late Pleistocene is critical to understanding the global climate system and projections of future sea level rise. Here, we observed notable glacial–interglacial cyclicity in magnetic properties, bulk detrital Sr–Nd isotopes, and Fe/Ti ratios over the previous 530 kyr in three well-dated gravity cores from the continental rise offshore of Prydz Bay (East Antarctica). Our results show that Antarctic continental sources with more Ti-rich magnetite, less radiogenic epsilon neodymium (ε), and higher Fe/Ti ratios were predominant during glacials in comparison with interglacials. Specifically, the ε amplitude through MIS 11–5 differs from that in the remainder of the records, which is also expressed in the magnetic coercivity cycles with subdued patterns. Following source identification on the basis of the detrital Sr–Nd distribution, we recognize two main (rock type) sources and infer two types of ice drainage flow pattern (“flank” and “channelized”), which follow different pathways in the Lambert Glacier–Amery Ice Shelf system (LG-AISS). The first follows an eastern path connecting the Ingrid Christensen Coast (flank), while the second follows a central channel via the LG-AISS (channelized) during MIS 11–5. Regular dynamics on glacial–interglacial timescales, manifested by changes in magnetic coercivity, are closely related to the modeled Antarctic ice volume and ice sheet movement, in which the second channelized pathway during MIS 11–5 corresponds to a 340-kyr-long episode with contiguous warmer-than-present Antarctic interglacials (MIS 11, 9, 7, and 5). Our records thus provide the clearest evidence so far of variable patterns of ice sheet dynamics during the late Pleistocene in the Prydz Bay sector of East Antarctica, which coincided with similar variation of ice drainage during the late Miocene–early Pliocene at around 1.13 Ma (ODP188). Similar ice drainage changes in these two periods imply that major ice flow reconfiguration can be triggered repeatedly by abrupt changes from a stable warm period to a cold one. The presented data not only reveal glacial–interglacial cyclicity in ice sheet advance and retreat in the meridional direction, but also implicate latitudinal adjustment (lateral) within a thin elongated drainage basin of the LG-AISS.

Detrital εNd East Antarctic ice sheet dynamics Late Pleistocene glacial–interglacial cycles Magnetic coercivity cyclicity Terrigenous provenance

SCI ; EI

英语

其他

China National Science Foundation Program[41676191,41376072,41806063] ; Project on the Impact and Response of Antarctic Seas to Climate Change (IRASCC2020-2022) - Chinese Arctic and Antarctic Administration["01-03-02","03-02"] ; Shenzhen Science and Technology Program[KQTD20170810111725321]

Physical Geography ; Geology

Geography, Physical ; Geosciences, Multidisciplinary

WOS:000766906200005

PERGAMON-ELSEVIER SCIENCE LTD

20215211399039

Coercive force ; Flow patterns ; Glaciers ; Ice ; Magnetism ; Magnetite ; Offshore oil well production ; Sea level

Oceanography, General:471.1 ; Geology:481.1 ; Oil Field Production Operations:511.1 ; Fluid Flow, General:631.1 ; Magnetism: Basic Concepts and Phenomena:701.2

GEOSCIENCES

2-s2.0-85121700411

Scopus

1.Key Laboratory of Marine Geology and Metallogeny,First Institute of Oceanography,Ministry of Natural Resources,Qingdao,266061,China
2.Laboratory for Marine Geology,Qingdao National Laboratory for Marine Science and Technology,Qingdao,266061,China
3.Center for Marine Magnetism,Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,518005,China
4.State Key Laboratory of Marine Geology,Tongji University,Shanghai,200092,China

Ge，Shulan,Chen，Zhihua,Liu，Qingsong,等. Dynamic response of East Antarctic ice sheet to Late Pleistocene glacial–interglacial climatic forcing[J]. QUATERNARY SCIENCE REVIEWS,2022,277.

Ge，Shulan.,Chen，Zhihua.,Liu，Qingsong.,Wu，Li.,Zhong，Yi.,...&Zhang，Qiang.(2022).Dynamic response of East Antarctic ice sheet to Late Pleistocene glacial–interglacial climatic forcing.QUATERNARY SCIENCE REVIEWS,277.

Ge，Shulan,et al."Dynamic response of East Antarctic ice sheet to Late Pleistocene glacial–interglacial climatic forcing".QUATERNARY SCIENCE REVIEWS 277(2022).