气候变化领域集成服务门户(CCPortal): Tracking rockglacier evolution in the Eastern Alps from the Lateglacial to the early Holocene

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DOI	10.1016/j.quascirev.2020.106424
	Tracking rockglacier evolution in the Eastern Alps from the Lateglacial to the early Holocene
	Steinemann O.; Reitner J.M.; Ivy-Ochs S.; Christl M.; Synal H.-A.
发表日期	2020
ISSN	0277-3791
卷号	241
英文摘要	Relict rockglaciers are distinctive indicators of past permafrost occurrence. Their lower limit is attributed to a former mean annual air temperature (MAAT) of below −2 °C. This study provides a comprehensive dataset of 34 10Be exposure ages from boulders along two complex series of relict rockglaciers, called Tandl rockglaciers and Norbert rockglaciers (Carinthia, Austria). The lowest Tandl rockglacier complex stabilised around 14 ka at an elevation of 1350 m a.s.l., the lowest Norbert rockglaciers (1580 and 1730 m a.s.l.) stabilised around 15.7 ka. Additionally, in both study sites the low elevation relict rockglaciers interacted with glacial deposits of the local pre-Bølling glaciers (Gschnitz stadial glacier). Temperature lowering based on our data of the Gschnitz rockglaciers ranges between 6.3 and 4.5 °C compared to modern MAAT. The cross-cutting relationships of the rockglaciers and the glacial deposits together with the exposure ages of the rockglaciers, indicate that these rockglaciers, and therewith also permafrost, developed shortly after or even simultaneously with retreat of the Gschnitz stadial glaciers. This is the first permafrost formation in the Alpine areas after the retreat of the (warm-based) Last Glacial Maximum glaciers. The Tandl and Norbert rockglacier lobes located at higher elevations, up to about 2300 m a.s.l., finally stabilised in the early Holocene; ages of several dated lobes lie between 12-10 ka. At this time, which corresponds to the Egesen stadial (Younger Dryas) cold phase, rockglaciers and glaciers co-existed. From the lowest position of the Egesen rockglacier lobe at the Tandl site (1700 m a.s.l.), a temperature lowering for the Egesen stadial of −4.6 °C was calculated. This study highlights the potential of relict rockglacier deposits as an independent paleoclimate archive and their usefulness for reconstruction of past permafrost development and distribution in high mountain areas when they can be placed in a temporal framework. © 2020 Elsevier Ltd
英文关键词	Carinthia; Cosmogenic 10Be; Glacier-rockglacier interaction; Gschnitz stadial; Periglacial; Permafrost development; Relict rockglaciers
语种	英语
scopus关键词	Deposits; Permafrost; Complex series; Cross-cutting; Early Holocene; Glacial deposits; High mountains; Last Glacial Maximum; Mean annual air temperatures; Paleoclimates; Glacial geology; air temperature; Holocene; Last Glacial Maximum; late glacial; permafrost; reconstruction; rock glacier; Younger Dryas; Alps; Austria; Carinthia; Eastern Alps
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/151402
作者单位	Laboratory of Ion Beam Physics, ETH Zürich, Otto-Stern-Weg 5, Zürich, 8093, Switzerland; Geological Survey of Austria, Neulinggasse 38Vienna 1030, Austria
推荐引用方式 GB/T 7714	Steinemann O.,Reitner J.M.,Ivy-Ochs S.,et al. Tracking rockglacier evolution in the Eastern Alps from the Lateglacial to the early Holocene[J],2020,241.
APA	Steinemann O.,Reitner J.M.,Ivy-Ochs S.,Christl M.,&Synal H.-A..(2020).Tracking rockglacier evolution in the Eastern Alps from the Lateglacial to the early Holocene.Quaternary Science Reviews,241.
MLA	Steinemann O.,et al."Tracking rockglacier evolution in the Eastern Alps from the Lateglacial to the early Holocene".Quaternary Science Reviews 241(2020).