Journal: Journal of Quaternary Science

Abbreviation

J. Quat. Sci.

Publisher

Wiley

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ISSN

0267-8179
1099-1417

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Publications 1 - 5 of 5
  • Abrupt intrinsic and extrinsic responses of southwestern Iberian vegetation to millennial-scale variability over the past 28 ka
    Item type: Journal Article
    Cutmore, Anna; Ausín, Blanca; Maslin, Mark; et al. (2022)
    Journal of Quaternary Science
    We present new high-resolution pollen records combined with palaeoceanographic proxies from the same samples in deep-sea cores SHAK06-5K and MD01-2444 on the southwestern Iberian Margin, documenting regional vegetation responses to orbital and millennial-scale climate changes over the last 28 ka. The chronology of these records is based on high-resolution radiocarbon dates of monospecific samples of the planktonic foraminifera Globigerina bulloides, measured from SHAK06-5K and MD01-2444 and aligned using an automated stratigraphical alignment method. Changes in temperate and steppe vegetation during Marine Isotope Stage 2 are closely coupled with sea surface temperature (SST) and global ice-volume changes. The peak expansion of thermophilous woodland between similar to 10.1 and 8.4 cal ka BP lags behind the boreal summer insolation maximum by similar to 2 ka, possibly arising from residual high-latitude ice-sheets into the Holocene. Rapid changes in pollen percentages are coeval with abrupt transitions in SSTs, precipitation and winter temperature at the onset and end of Heinrich Stadial 2, the ice-rafted debris event and end of Heinrich Stadial 1, and the onset of the Younger Dryas, suggesting extrinsically forced southwestern Iberian ecosystem changes by abrupt North Atlantic climate events. In contrast, the abrupt decline in thermophilous elements at similar to 7.8 cal ka BP indicates an intrinsically mediated abrupt vegetation response to the gradually declining boreal insolation, potentially resulting from the crossing of a seasonality of precipitation threshold. (C) 2021 The Authors. Journal of Quaternary Science Published by John Wiley & Sons, Ltd.
  • The Würmian late-glacial in lowland Switzerland
    Item type: Journal Article
    Ammann, Brigitta; Lotter, Andre F.; Eicher, Ueli; et al. (1994)
    Journal of Quaternary Science
    A synthesis is provided of Late‐glacial (14‐9 ka BP) environmental changes in lowland Switzerland (the ‘Swiss Plateau’). The chronology of deglaciation and subsequent developments in vegetation cover in the area are summarised. The sequence of climatic variations experienced in the region during the Late‐glacial is then described and a curve representing the main palaeotemperature variations is presented.
  • Multi-million-year evolution of the Greenland Ice Sheet in Inglefield Land, North Greenland
    Item type: Journal Article
    Søndergaard, Anne Sofie; Lund Andersen, Jane; Krog Larsen, Nicolaj; et al. (2025)
    Journal of Quaternary Science
    Information on past sensitivity of the Greenland Ice Sheet to climate change is of importance for optimizing models simulating the future evolution of ice mass loss. While the ice-sheet change during the Lateglacial and Holocene is relatively well constrained, the long-term (multi-million-year) evolution of the Greenland Ice Sheet remains poorly known. In this study, we use in situ cosmogenic ¹⁰Be, ²⁶Al, and ¹⁴C nuclide concentrations from bedrock in Inglefield Land, western North Greenland, together with Markov chain Monte Carlo inversion to constrain the multi-million-year ice sheet history of this area. Our results indicate that the area became ice-covered for the first time at the beginning of the Quaternary and was glaciated for extensive periods during the Pleistocene. We cannot resolve whether the ice cover was confined to local ice caps or part of a larger ice sheet but only conclude that the ice cover was likely persistent with short interglacials. Further, our results show that the area has been characterized by low erosion rates (<1 m/Myr) during the past million years, suggesting cold-based ice similar to today's conditions.
  • New geomorphological and chronological constraints for glacial deposits in the Rivoli-Avigliana end-moraine system and the lower Susa Valley (Western Alps, NW Italy)
    Item type: Journal Article
    Ivy-Ochs, Susan; Lucchesi, Stefania; Baggio, Paolo; et al. (2018)
    Journal of Quaternary Science
  • The onset of Pliocene-Early Pleistocene fluvial aggradation in the Southeastern Alpine Foreland (Velenje Basin, Slovenia) and its paleoenvironmental implications
    Item type: Journal Article
    Gale, Eva Mencin; Jamšek Rupnik, Petra; Akçar, Naki; et al. (2024)
    Journal of Quaternary Science
    In this study, we focused on the Pliocene–Early Pleistocene fluvial terraces in the Velenje Basin and reconstructed the morphostratigraphy, sedimentary depositional environment, provenance and age of the gravel deposits using geomorphological, sedimentological, petrographic and chronological analyses. Geomorphological mapping revealed the presence of two main river-terrace groups. The terraces in the older terrace group are severely degraded and preserved only as remnants capping high ground, while in contrast the younger group is better preserved. Detailed lithofacies analyses of four selected stratigraphic sections of the older terrace group show that the gravel was deposited in a meandering and wandering environment. The gravel consists of metamorphic, igneous, volcaniclastic, clastic and carbonate lithologies derived from the north, east and west from the Paka River catchments. To determine the timing of deposition, we performed isochron-burial dating using cosmogenic ²⁶Al and ¹⁰Be. Our new age constraints date the deposition of the older terrace group to 2.7 ± 0.3 Ma. Establishing the aggradation and incision model of the Velenje Basin documents pronounced regional tectonic uplift during the Pliocene–Early Pleistocene, which led to incision and the subsequent formation of a terrace staircase.
Publications 1 - 5 of 5