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  • 1.
    Divine, Dmitry
    et al.
    Norwegian Polar Res Inst, Fram Ctr, NO-9296 Tromso, Norway.;Univ Tromso, Fac Sci & Technol, Dept Math & Stat, NO-9037 Tromso, Norway..
    Isaksson, Elisabeth
    Norwegian Polar Res Inst, Fram Ctr, NO-9296 Tromso, Norway..
    Martma, Tonu
    Tallinn Univ Technol, Inst Geol, EE-19086 Tallinn, Estonia..
    Meijer, Harro A. J.
    Univ Groningen, Ctr Isotope Res, NL-9747 AG Groningen, Netherlands..
    Moore, John
    Univ Lapland, Arctic Ctr, FI-96101 Rovaniemi, Finland..
    Pohjola, Veijo
    Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden..
    van de Wal, Roderik S. W.
    Univ Utrecht, Inst Marine & Atmospher Res Utrecht, NL-3584 CC Utrecht, Netherlands..
    Godtliebsen, Fred
    Univ Tromso, Fac Sci & Technol, Dept Math & Stat, NO-9037 Tromso, Norway..
    Thousand years of winter surface air temperature variations in Svalbard and northern Norway reconstructed from ice-core data2011Inngår i: Polar Research, ISSN 0800-0395, E-ISSN 1751-8369, Vol. 30, artikkel-id 7379Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Two isotopic ice core records from western Svalbard are calibrated to reconstruct more than 1000 years of past winter surface air temperature variations in Longyearbyen, Svalbard, and Vardo, northern Norway. Analysis of the derived reconstructions suggests that the climate evolution of the last millennium in these study areas comprises three major sub-periods. The cooling stage in Svalbard (ca. 800-1800) is characterized by a progressive winter cooling of approximately 0.9 degrees C century(-1) (0.38 degrees C century(-1) for Vardo) and a lack of distinct signs of abrupt climate transitions. This makes it difficult to associate the onset of the Little Ice Age in Svalbard with any particular time period. During the 1800s, which according to our results was the coldest century in Svalbard, the winter cooling associated with the Little Ice Age was on the order of 4 degrees C (1.3 degrees C for Vardo) compared to the 1900s. The rapid warming that commenced at the beginning of the 20th century was accompanied by a parallel decline in sea-ice extent in the study area. However, both the reconstructed winter temperatures as well as indirect indicators of summer temperatures suggest the Medieval period before the 1200s was at least as warm as at the end of the 1990s in Svalbard.

  • 2. Isaksson, E
    et al.
    Divine, D
    Kohler, J
    Martma, T
    Pohjola, V
    Motoyama, H
    Watanabe, O
    Climate oscillations as recorded in Svalbard ice core delta O-18 records between AD 1200 and 19972005Inngår i: Geografiska Annaler. Series A, Physical Geography, ISSN 0435-3676, E-ISSN 1468-0459, Vol. 87A, nr 1, s. 203-214Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We apply two different time series analytical tools to 8180 records from two Svalbard ice cores. One ice core is from Lomonosovfonna at 1250 m a.s.l. and the other from Austfonna at 750 m a.s.l. These cores are estimated to cover at least the past 800 years and have been dated using a combination of known reference horizons and glacial modelling. Wavelet analysis reveals low frequency oscillations on the 60-120-year scale on the lower elevation site Austfonna while the higher altitude site on Lomonosovfonna does not reveal such variability throughout the record. The second method, Significant Zero Crossing of Derivates (SiZer) does not resolve the low-frequency periodicity seen in the wavelet analysis. The low-frequency variability resolved by the wavelet analysis is similar to what has been found in various climate records including instrumental temperatures and tree-rings, and has been proposed as the most important oscillation for the observed trends in Arctic air temperatures.

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