气候变化领域集成服务门户(CCPortal): Ice surface changes during recent glacial cycles along the Jutulstraumen and Penck Trough ice streams in western Dronning Maud Land; East Antarctica

CCPortal

DOI	10.1016/j.quascirev.2020.106636
	Ice surface changes during recent glacial cycles along the Jutulstraumen and Penck Trough ice streams in western Dronning Maud Land; East Antarctica
	Andersen J.L.; Newall J.C.; Blomdin R.; Sams S.E.; Fabel D.; Koester A.J.; Lifton N.A.; Fredin O.; Caffee M.W.; Glasser N.F.; Rogozhina I.; Suganuma Y.; Harbor J.M.; Stroeven A.P.
发表日期	2020
ISSN	0277-3791
卷号	249
英文摘要	Reconstructing past ice-sheet surface changes is key to testing and improving ice-sheet models. Data constraining the past behaviour of the East Antarctic Ice Sheet are sparse, limiting our understanding of its response to past, present and future climate change. Here, we report the first cosmogenic multi-nuclide (10Be, 26Al, 36Cl) data from bedrock and erratics on nunataks along the Jutulstraumen and Penck Trough ice streams in western Dronning Maud Land, East Antarctica. Spanning elevations between 741 and 2394 m above sea level, the samples have apparent exposure ages between 2 ka and 5 Ma. The highest-elevation bedrock sample indicates (near-) continuous minimum exposure since the Pliocene, with a low apparent erosion rate of 0.15 ± 0.03 m Ma−1, which is similar to results from eastern Dronning Maud Land. In contrast to studies in eastern Dronning Maud Land, however, our data show clear indications of a thicker-than-present ice sheet within the last glacial cycle, with a thinning of ∼35–120 m during the Holocene (∼2–11 ka). Difficulties in separating suitable amounts of quartz from the often quartz-poor rock-types in the area, and cosmogenic nuclides inherited from exposure prior to the last deglaciation, prevented robust thinning estimates from elevational profiles. Nevertheless, the results clearly demonstrate ice-surface fluctuations of several hundred meters between the current grounding line and the edge of the polar plateau for the last glacial cycle, a constraint that should be considered in future ice-sheet model simulations. © 2020 Elsevier Ltd
英文关键词	Antarctica; Cosmogenic isotopes; Dronning Maud Land; Glaciation; Quaternary
语种	英语
scopus关键词	Climate change; Data streams; Electric grounding; Glacial geology; Glaciers; Isotopes; Quartz; Sea level; Cosmogenic nuclides; East antarctic ice sheets; East antarctica; Future climate; Grounding line; Ice sheet models; Last deglaciation; Last glacial cycles; Ice; bedrock; deglaciation; elevation; erosion rate; grounding line; ice sheet; ice stream; Last Glacial Maximum; reconstruction; Antarctic Ice Sheet; Antarctica; East Antarctic Ice Sheet; East Antarctica; Queen Maud Land
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151241
作者单位	Department of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, United States; Geological Survey of Norway, Trondheim, Norway; Geomorphology & Glaciology, Department of Physical Geography, Stockholm University, Stockholm, Sweden; Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Scottish Universities Environmental Research Centre, Glasgow, United Kingdom; Department of Physics and Astronomy, Purdue University, West Lafayette, United States; Department of Geography, Norwegian University of Science and Technology, Trondheim, Norway; Centre for Glaciology, Department of Geography and Earth Sciences, Aberystwyth University, Aberystwyth, United Kingdom; National Institute of Polar Research, Japan; The Graduate University for Advanced Studies, SOKENDAI, Japan; Purdue University Global, West Lafayette, IN, United States
推荐引用方式 GB/T 7714	Andersen J.L.,Newall J.C.,Blomdin R.,et al. Ice surface changes during recent glacial cycles along the Jutulstraumen and Penck Trough ice streams in western Dronning Maud Land; East Antarctica[J],2020,249.
APA	Andersen J.L..,Newall J.C..,Blomdin R..,Sams S.E..,Fabel D..,...&Stroeven A.P..(2020).Ice surface changes during recent glacial cycles along the Jutulstraumen and Penck Trough ice streams in western Dronning Maud Land; East Antarctica.Quaternary Science Reviews,249.
MLA	Andersen J.L.,et al."Ice surface changes during recent glacial cycles along the Jutulstraumen and Penck Trough ice streams in western Dronning Maud Land; East Antarctica".Quaternary Science Reviews 249(2020).