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Constructing a temporal framework for landscape dynamics in the eastern Swiss Alps during the Lateglacial and early Holocene

Titel Englisch Constructing a temporal framework for landscape dynamics in the eastern Swiss Alps during the Lateglacial and early Holocene
Gesuchsteller/in Egli Markus
Nummer 109565
Förderungsinstrument Projektförderung (Abt. I-III)
Forschungseinrichtung Geographisches Institut Universität Zürich
Hochschule Universität Zürich – ZH
Hauptdisziplin Geomorphologie
Beginn/Ende 01.04.2006 - 31.03.2009
Bewilligter Betrag 182'500.00
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Keywords (6)

geomorphology; absolute and relative dating; geochronology ; weathering ; soils; climate change

Lay Summary (Englisch)

Lead
Lay summary
Easily recognizable traces of former climatic variations make high-mountain a unique archive about landscape history as well as a suitable database for predicting or modelling potential future climate change effects on landscape dynamics. The present project aims at dating geomorphic features (e.g. moraines, transfluence passes, rockglaciers) to develop a conceptual approach for the quantification of such evolutions during the Lateglacial and early to mid Holocene period. The general pattern of the glacigenic deposits in Alpine valleys can be associated with distinct readvance phases of the retreating ice-stream systems after the LGM (Last Glacial Maximum; 25'000 – 20'000 14C cal yBP). However, the chronology of these lateglacial fluctuations is still poorly established so far and is based only on a few, often questionable minimum dates, selected pollen profiles and the analysis of lake sediments. Most of the stadials older than Egesen (Younger Dryas) still need direct links to an absolute time scale. A reference point is the chronostratigraphic time equivalence of the Egesen (or the local Pontresina) stadial and the Younger Dryas period (appr. 12600 – 11500 14C cal yBP). Special emphasis is given to the lateglacial and Holocene period in the Eastern Swiss Alps, with related glacier fluctuations, periods of rockglacier activity, related landslides and the corresponding soil development upon such surfaces. Among the dating techniques are numerical methods such as radiocarbon dating (14C), exposure dating using 10Be and 26Al and optically stimulated luminescence (OSL) as well as relative dating techniques such as soil chemistry and mineralogical techniques, the measurement of the weathering rind and of the Schmidt-hammer rebound value. The main products of the planned work will be:
1)A marked improvement of the now-available absolute chronology within the time window of the Alpine Lateglacial and Holocene. For some of these features, indications about their age are already available either from published data or from preliminary investigations of our own research.
2)A strong enhancement in methodological aspects by cross-checking the different dating methods: in order to verify the exposure or 14C ages, both absolute methods as well as relative age dating techniques will be applied to the same landforms settings wherever possible. A cross-check of all these methods used will allow an extended interpretation, mutual control and a more accurate estimate of possible error sources.
3)The planned construction of a more detailed temporal framework finally will enable also numerical (GIS-based) modelling of landscape dynamics in the Younger Dryas/Holocene period.Together with the existing dataset the expected new insights will lead to a better understanding the processes of high mountain landscape evolution and of fast warming scenarios and increasing system disequilibria.
Direktlink auf Lay Summary Letzte Aktualisierung: 21.02.2013

Verantw. Gesuchsteller/in und weitere Gesuchstellende

Mitarbeitende

Name Institut

Verbundene Projekte

Nummer Titel Start Förderungsinstrument
124380 Constructing a temporal framework for landscape dynamics in the eastern Swiss Alps during the Lateglacial and early Holocene 01.04.2009 Projektförderung (Abt. I-III)
124380 Constructing a temporal framework for landscape dynamics in the eastern Swiss Alps during the Lateglacial and early Holocene 01.04.2009 Projektförderung (Abt. I-III)
128735 Erneuerung des ETH Tandem Beschleunigers 01.03.2010 R'EQUIP

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