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  • 1
    Language: English
    In: Quaternary Science Reviews, 3/2012, Vol.36, C, pp.78-90
    Description: Here we present the entire range of Lateglacial tree-ring chronologies from Switzerland, Germany, France, covering the Lateglacial north and west of the Alps without interruption as well as finds from northern Italy, complemented by a (super 14) C data set of the Swiss chronologies. Geographical expansion of cross-matched European Lateglacial chronologies, limits and prospects of teleconnection between remote sites and extension of the absolute tree-ring chronology are discussed. High frequency signals and long-term fluctuations are revealed by the ring-width data sets of the newly constructed Swiss Late-glacial Master Chronology (SWILM) as well as the Central European Lateglacial Master Chronology (CELM) spanning 1606 years. They agree well with the characteristics of Boelling/Alleroed (GI-1) and the transition into Younger Dryas (GS-1). The regional chronologies of Central Europe may provide improved interconnection to other terrestrial or marine high-resolution archives. Nevertheless the breakthrough to a continuous absolute chronology back to Boelling (GI-1e) has not yet been achieved. A gap remains, even though it is covered by several floating chronologies from France and Switzerland. Abstract Copyright (2012) Elsevier, B.V.
    Keywords: Quaternary Geology ; Geochronology ; Absolute Age ; C-14 ; Carbon ; Case Studies ; Cenozoic ; Central Europe ; Europe ; France ; Geochronology ; Germany ; Isotopes ; Italy ; Late-Glacial Environment ; Pleistocene ; Quaternary ; Radioactive Isotopes ; Relative Age ; Southern Europe ; Switzerland ; Tree Rings ; Upper Pleistocene ; Western Europe;
    ISSN: 02773791
    E-ISSN: 1873457X
    Source: Elsevier (via CrossRef)
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  • 2
    Language: English
    In: Quaternary Science Reviews, 2001, Vol.20(11), pp.1223-1232
    Description: Late glacial and Holocene tree-ring chronologies are unique archives, which provide various information on past environments on a true annual time scale. Changes in ring-width can be related to past climate anomalies and dendrodated wood provides an ideal source for radiocarbon calibration. We present a 1051 year tree-ring chronology from the Late Glacial, built from subfossil Scots pines (Pinus sylvestris) that grew in different regions of Central and Southern Europe. Through a series of high-precision radiocarbon measurements we obtained a floating radiocarbon chronology, which allowed accurate wiggle-matching to the INTCAL98 calibration curve. The trees show a coherent pattern in ring-width variations throughout Central Europe, and extending into the Mediterranean, which indicates a strong external climatic factor, most probably temperature during the growing season. We identified major growth events, which appear synchronous with events seen in isotopic and tracer signals in the Greenland ice cores and with changes in the strength of upwelling in the Cariaco Basin.
    Keywords: Sciences (General) ; Geology
    ISSN: 0277-3791
    E-ISSN: 1873-457X
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  • 3
    Language: English
    In: Quaternary Science Reviews, 2008, Vol.27(1), pp.29-41
    Description: Evidence of annually resolved environmental variations during the Allerød interstadial is presented using 81 fossil Scots pine tree-ring series from Gaenziloo and Landikon, near Zurich, Switzerland. The absolute age of the trees ranges between 11,920 and 10,610 C BP, which was determined by wiggle-matching radiocarbon ages to the Cariaco C data set. From the two sites we created a composite floating Allerød chronology on the basis of their 632 years of overlap ( =0.57), after individual spline detrending. Merging both data sets resulted in a Lateglacial tree-ring chronology covering 1050 years. Regional curve standardization (RCS) was applied to preserve low-frequency information. Growth behavior of the fossil trees was compared with a recent composite pine data set from the central Swiss Alps and reveals distinct differences. The new Allerød RCS chronology reveals major Lateglacial variations, such as the Gerzensee oscillation, the abrupt climate shift towards the Younger Dryas and some short-term events. Radiocarbon ages agree well with those from other sites on the Swiss Plateau. For hemispheric comparisons we used the annual layer thickness record from the NGRIP ice core and the gray-scale varve record from the Cariaco basin. Even though the amplitudes are not yet fully understood, similarities on decadal-to-centennial scales are apparent.
    Keywords: Sciences (General) ; Geology
    ISSN: 0277-3791
    E-ISSN: 1873-457X
    Source: ScienceDirect Journals (Elsevier)
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  • 4
    Language: English
    In: Quaternary Science Reviews, 1/2008, Vol.27(1-2), pp.29-41
    Description: Evidence of annually resolved environmental variations during the Allerod interstadial is presented using 81 fossil Scots pine tree-ring series from Gaenziloo and Landikon, near Zurich, Switzerland. The absolute age of the trees ranges between 11,920 and 10,610 (super 14) C BP, which was determined by wiggle-matching radiocarbon ages to the Cariaco (super 14) C data set. From the two sites we created a composite floating Allerod chronology on the basis of their 632 years of overlap (r=0.57), after individual spline detrending. Merging both data sets resulted in a Lateglacial tree-ring chronology covering 1050 years. Regional curve standardization (RCS) was applied to preserve low-frequency information. Growth behavior of the fossil trees was compared with a recent composite pine data set from the central Swiss Alps and reveals distinct differences. The new Allerod RCS chronology reveals major Lateglacial variations, such as the Gerzensee oscillation, the abrupt climate shift towards the Younger Dryas and some short-term events. Radiocarbon ages agree well with those from other sites on the Swiss Plateau. For hemispheric comparisons we used the annual layer thickness record from the NGRIP ice core and the gray-scale varve record from the Cariaco basin. Even though the amplitudes are not yet fully understood, similarities on decadal-to-centennial scales are apparent.
    Keywords: Quaternary Geology ; Allerod ; C-14 ; Carbon ; Cenozoic ; Central Europe ; Chronology ; Climate Change ; Coniferales ; Europe ; Event Stratigraphy ; Gaenziloo Switzerland ; Glacial Environment ; Gymnospermae ; Interglacial Environment ; Isotopes ; Landikon Switzerland ; Paleoclimatology ; Paleoenvironment ; Pinaceae ; Pinus ; Pinus Sylvestris ; Plantae ; Pleistocene ; Quaternary ; Radioactive Isotopes ; Spermatophyta ; Splines ; Statistical Analysis ; Switzerland ; Tree Rings ; Upper Pleistocene ; Upper Weichselian ; Weichselian ; Zurich Switzerland;
    ISSN: 02773791
    Source: Elsevier (via CrossRef)
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  • 5
    Language: English
    In: Quaternary Science Reviews, 2009, Vol.28(25), pp.2982-2990
    Description: Atmospheric radiocarbon variations over the Younger Dryas interval, from ∼13,000 to 11,600 cal yr BP, are of immense scientific interest because they reveal crucial information about the linkages between climate, ocean circulation and the carbon cycle. However, no direct and reliable atmospheric C records based on tree rings for the entire Younger Dryas have been available. In this paper, we present (1) high-precision C measurements on the extension of absolute tree-ring chronology from 12,400 to 12,560 cal yr BP and (2) high-precision, high-resolution atmospheric C record derived from a 617-yr-long tree-ring chronology of Huon pine from Tasmania, Australia, spanning the early Younger Dryas. The new tree-ring C records bridge the current gap in European tree-ring radiocarbon chronologies during the early Younger Dryas, linking the floating Lateglacial Pine record to the absolute tree-ring timescale. A continuous and reliable atmospheric C record for the past 14,000 cal yr BP including the Younger Dryas is now available. The new records indicate that the abrupt rise in atmospheric Δ C associated with the Younger Dryas onset occurs at ∼12,760 cal yr BP, ∼240 yrs later than that recorded in Cariaco varves, with a smaller magnitude of ∼40‰ followed by several centennial Δ C variations of 20–25‰. Comparing the tree-ring Δ C to marine-derived Δ C and modelled Δ C based on ice-core Be fluxes, we conclude that changes in ocean circulation were mainly responsible for the Younger Dryas onset, while a combination of changes in ocean circulation and C production rate were responsible for atmospheric Δ C variations for the remainder of the Younger Dryas.
    Keywords: Sciences (General) ; Geology
    ISSN: 0277-3791
    E-ISSN: 1873-457X
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  • 6
    Language: English
    In: Quaternary Science Reviews, 15 January 2013, Vol.60, pp.91-109
    Description: Mechanisms of climatic control on river system development are still only partially known. Palaeohydrological investigations from river valleys often lack a precise chronological control of climatic processes and fluvial dynamics, which is why their specific forces remain unclear. In this multidisciplinary case study from the middle Elbe river valley (northern Germany) multiple dating of sites (palynostratigraphy, radiocarbon- and OSL-dating) and high-resolution analyses of environmental and climatological proxies (pollen, plant macro-remains and ostracods) reveal a continuous record of the environmental and fluvial history from the Lateglacial to the early Holocene. Biostratigraphical correlation to northwest European key sites shows that river system development was partially out of phase with the main climatic shifts. The transition from a braided to an incised channel system predated the main phase of Lateglacial warming (∼14.6 ka BP), and the meandering river did not change its drainage pattern during the cooling of the Younger-Dryas period. Environmental reconstructions suggest that river dynamics were largely affected by vegetation cover, as a vegetation cover consisting of herbs, dwarf-shrubs and a few larger shrubs seems to have developed before the onset of the main Lateglacial warming, and pine forests appear to have persisted in the river valley during the Younger Dryas. In addition, two phases of high fluvial activity and new channel incision during the middle part of the Younger Dryas and during the Boreal were correlated with changes from dry towards wet climatic conditions, as indicated by evident lake level rises. Lateglacial human occupation in the river valley, which is shown by numerous Palaeolithic sites, forming one of the largest settlement areas of that period known in the European Plain, is assigned to the specific fluvial and environmental conditions of the early Allerød. ► First high resolution record of Lateglacial fluvial dynamics in the Elbe system. ► New insights into the timing and climate dependency of fluvial processes. ► Fluvial development was partially out of phase with main climatic shifts. ► Vegetation cover as an important factor in controlling river system evolution.
    Keywords: River System Development ; Climatic Fluctuations ; Palaeochannels ; Biostratigraphy ; Lateglacial ; Elbe ; Late Palaeolithic ; Sciences (General) ; Geology
    ISSN: 0277-3791
    E-ISSN: 1873-457X
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