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  • 1
    Electronic Resource
    Electronic Resource
    Evidence from north-west Canada for an early Holocene Milankovitch thermal maximum (1983)
    [s.l.] : Nature Publishing Group
    Nature 305 (1983), S. 126-128 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Western and central Canada showing the site locations: 1, Hanging Lake; 2, Sleet Lake; 3, Twin Tamarack Lake; 4, Lateral Pond. Dashed line indicates the approximate position of Laurentide ice at 10,000 yr; solid line indicates the Cordilleran ice at 10,000 yr. The area, centred on the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/305126a0
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    Paper (German National Licenses)
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  • 2
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    Holocene thermal maximum in the western Arctic (0–180°W) (2004)
    Elsevier
    In:  Quaternary Science Reviews, 23 (5-6). pp. 529-560.
    Details
    Publication Date: 2015-02-24
    Description: The spatio-temporal pattern of peak Holocene warmth (Holocene thermal maximum, HTM) is traced over 140 sites across the Western Hemisphere of the Arctic (0–180°W; north of ∼60°N). Paleoclimate inferences based on a wide variety of proxy indicators provide clear evidence for warmer-than-present conditions at 120 of these sites. At the 16 terrestrial sites where quantitative estimates have been obtained, local HTM temperatures (primarily summer estimates) were on average 1.6±0.8°C higher than present (approximate average of the 20th century), but the warming was time-transgressive across the western Arctic. As the precession-driven summer insolation anomaly peaked 12–10 ka (thousands of calendar years ago), warming was concentrated in northwest North America, while cool conditions lingered in the northeast. Alaska and northwest Canada experienced the HTM between ca 11 and 9 ka, about 4000 yr prior to the HTM in northeast Canada. The delayed warming in Quebec and Labrador was linked to the residual Laurentide Ice Sheet, which chilled the region through its impact on surface energy balance and ocean circulation. The lingering ice also attests to the inherent asymmetry of atmospheric and oceanic circulation that predisposes the region to glaciation and modulates the pattern of climatic change. The spatial asymmetry of warming during the HTM resembles the pattern of warming observed in the Arctic over the last several decades. Although the two warmings are described at different temporal scales, and the HTM was additionally affected by the residual Laurentide ice, the similarities suggest there might be a preferred mode of variability in the atmospheric circulation that generates a recurrent pattern of warming under positive radiative forcing. Unlike the HTM, however, future warming will not be counterbalanced by the cooling effect of a residual North American ice sheet.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1016/j.quascirev.2003.09.007
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    A new terrestrial palaeoenvironmental record from the Bering Land Bridge and context for human dispersal (2018)
    Royal Society
    Details
    Publication Date: 2018-06-21
    Description: Palaeoenvironmental records from the now-submerged Bering Land Bridge (BLB) covering the Last Glacial Maximum (LGM) to the present are needed to document changing environments and connections with the dispersal of humans into North America. Moreover, terrestrially based records of environmental changes are needed in close proximity to the re-establishment of circulation between Pacific and Atlantic Oceans following the end of the last glaciation to test palaeo-climate models for the high latitudes. We present the first terrestrial temperature and hydrologic reconstructions from the LGM to the present from the BLB's south-central margin. We find that the timing of the earliest unequivocal human dispersals into Alaska, based on archaeological evidence, corresponds with a shift to warmer/wetter conditions on the BLB between 14 700 and 13 500 years ago associated with the early Bølling/Allerød interstadial (BA). These environmental changes could have provided the impetus for eastward human dispersal at that time, from Western or central Beringia after a protracted human population standstill. Our data indicate substantial climate-induced environmental changes on the BLB since the LGM, which would potentially have had significant influences on megafaunal and human biogeography in the region.
    Keywords: ecology, environmental science
    Electronic ISSN: 2054-5703
    Topics: Natural Sciences in General
    Published by Royal Society
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