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  • Kaiser, Klaus-Felix
  • 1
    Language: English
    In: Quaternary International, 16 November 2012, Vol.279-280, pp.231-231
    Keywords: Geology
    ISSN: 1040-6182
    E-ISSN: 1873-4553
    Source: ScienceDirect Journals (Elsevier)
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  • 2
    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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  • 3
    Language: English
    In: Schweizerische Zeitschrift fur Forstwesen, 06/2004, Vol.155(6), pp.233-237
    ISSN: 0036-7818
    Source: CrossRef
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  • 4
    Language: English
    In: Quaternary Research, 1994, Vol.42(3), pp.288-298
    Description: Dendrochronological analysis of fossil wood from Two Creeks, Wisconsin, reveals that the Two Creekan Intetstade lasted at least 252 yr. The sites crossdated by tree rings cover an area of about 970 km 2 . AMS determinations from the beginning and end of the chronology open a 14 C time window for the episode from 12,050 to 11,750 yr B.P. The interval is contemporaneous with the Older Dryas in northern Europe. The development of a forest covering at least 970 km 2 on the western shore of Lake Michigan indicates a water level about as low as in modern times. Glacier retreat must have opened drainage channels either through the Straits of Mackinac or via the Indian River Plateau into the eastern lakes. The beginning of the tree-ring chronology coincides with the peak of meltwater pulse 1A at 12,000 yr B.P. Increased amounts of meltwater seem to have disturbed the heat exchange between the waters and the atmosphere in the North Atlantic off the Gulf of St. Lawrence or affected the δ 18 O-ratio of the evaporation, causing the climatic or isotopic reversal of the Older Dryas in Greenland and northern Europe.
    Keywords: Geology
    ISSN: 0033-5894
    E-ISSN: 1096-0287
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  • 5
    In: Boreas, September 1987, Vol.16(3), pp.293-303
    Description: Pollen and mollusc deposits in a sedimentation series laid down in the Dattnau valley during the Late Glacial and early Post‐glacial were studied. For the first time δC and δO in land‐snail shells were measured. It was possible to reconstruct vegetational and climatic developments from the Bölling (. 12,500 B.P.) until well into the early Boreal (. 9,000 B.P.). The two sets of findings agree well. The Late Glacial is seen to comprise two intervals: the continuous, locally rather moist, warm Bölling/Alleröd period, and the subsequent . cold Younger Dryas. The profile ceases after the changeover from the Late Glacial to the Post‐glacial. The transitions from the Alleröd to the Younger Dryas and hence to the Preboreal and Boreal are both clearly identifiable in the pollen diagram; the mollusc record, however, ceases to be interpretable shortly before the climatic change to the Post‐glacial. The δO curve shows a clear distinction between the AllerÖd and the Younger Dryas. The Gerzensee fluctuation, immediately before this transition. is evident as a negative deviation.
    Keywords: Quaternary Geology ; Allerod ; Bolling ; C-13/C-12 ; Carbon ; Cenozoic ; Central Europe ; Dattnau Valley ; Europe ; Glaciation ; Interpretation ; Invertebrata ; Isotope Ratios ; Isotopes ; Microfossils ; Miospores ; Mollusca ; O-18/O-16 ; Oxygen ; Palynomorphs ; Pleistocene ; Pollen ; Pollen Analysis ; Quaternary ; Stable Isotopes ; Stratigraphy ; Switzerland ; Upper Pleistocene ; Upper Weichselian ; Weichselian ; Younger Dryas;
    ISSN: 0300-9483
    E-ISSN: 1502-3885
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  • 6
    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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  • 7
    In: Boreas, February 2008, Vol.37(1), pp.74-86
    Description: Annually resolved tree‐ring width variations and radiocarbon ages were measured from a collection of 120 Lateglacial pine stumps excavated on the Swiss Plateau. These data – representing the oldest absolutely dated wood samples worldwide – extend the absolute tree‐ring chronology from Central Europe by 183 years back to 12 593 cal. yr BP (10 644 cal. yr BC). They also yield a 1420‐year floating chronology covering the entire Allerød and the early Younger Dryas (14 170–12 750 cal. yr BP). Radiocarbon data suggest a 250‐year jump in the C reservoir correction around the time of the Allerød to Younger Dryas transition, although calendric dating of the floating chronology – by filling a ∼150 year gap – is necessary for confirmation. Various subgroups, based on the year of germination, were used to assess temporal changes in growth characteristics along the Allerød to Younger Dryas transition. Comparison of these Lateglacial data with a reference data set of living and historic pines from the Swiss Valais (AD 940–2000) revealed differences in both growth trend and level. The generally slower Lateglacial growth was likely influenced by higher geomorphic activity and severe climatic conditions. After removal of the biological age‐trend, a strong common signal found in the tree‐ring data suggests some skill in estimating interannual to multidecadal Lateglacial climatic variations.
    Keywords: Germination ; Interannual Variability ; Dendroclimatology ; Climatic Variations ; Tree Ring Analysis ; Reservoirs ; Climatic Conditions ; Europe ; Switzerland, Swiss Plateau ; Variations (551.583);
    ISSN: 0300-9483
    E-ISSN: 1502-3885
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  • 8
    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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  • 9
    Language: English
    In: Radiocarbon, 2004, Vol.46(3), pp.1111-1122
    Description: The combined oak and pine tree-ring chronologies of Hohenheim University are the backbone of the Holocene radiocarbon calibration for central Europe. Here, we present the revised Holocene oak chronology (HOC) and the Preboreal pine chronology (PPC) with respect to revisions, critical links, and extensions. Since 1998, the HOC has been strengthened by new trees starting at 10,429 BP (8480 BC). Oaks affected by cockchafer have been identified and discarded from the chronology. The formerly floating PPC has been cross-matched dendrochronologically to the absolutely dated oak chronology, which revealed a difference of only 8 yr to the published (super 14) C wiggle-match position used for IntCal98. The 2 parts of the PPC, which were linked tentatively at 11,250 BP, have been revised and strengthened by new trees, which enabled us to link both parts of the PPC dendrochronologically. Including the 8-yr shift of the oak-pine link, the older part of the PPC (pre-11,250 BP) needs to be shifted 70 yr to older ages with respect to the published data (Spurk 1998). The southern German part of the PPC now covers 2103 yr from 11,993-9891 BP (10,044-7942 BC). In addition, the PPC was extended significantly by new pine chronologies from other regions. A pine chronology from Avenches and Zurich, Switzerland, and another from the Younger Dryas forest of Cottbus, eastern Germany, could be crossdated and dendrochronologically matched to the PPC. The absolutely dated tree-ring chronology now extends back to 12,410 cal BP (10,461 BC). Therefore, the tree-ring based (super 14) C calibration now reaches back into the Central Younger Dryas. With respect to the Younger Dryas-Preboreal transition identified in the ring width of our pines at 11,590 BP, the absolute tree-ring chronology now covers the entire Holocene and 820 yr of the Younger Dryas.
    Keywords: Geochronology ; Quaternary Geology ; Absolute Age ; Angiospermae ; C-14 ; Calibration ; Carbon ; Cenozoic ; Central Europe ; Coniferales ; Dates ; Dicotyledoneae ; Europe ; Fossil Wood ; Geochronology ; Germany ; Gymnospermae ; Holocene ; Isotopes ; Methods ; Pinaceae ; Pinus ; Plantae ; Pleistocene ; Quaternary ; Quercus ; Radioactive Isotopes ; Spermatophyta ; Statistical Distribution ; Switzerland ; Tree Rings ; Upper Pleistocene;
    ISSN: 0033-8222
    E-ISSN: 1945-5755
    Source: CrossRef
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  • 10
    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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