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  • 1.
    Beaudon, Emilie
    et al.
    Univ Lapland, Arctic Ctr, Rovaniemi 96101, Finland..
    Arppe, Laura
    Univ Helsinki, Dept Geosci & Geog, FIN-00014 Helsinki, Finland..
    Jonsell, Ulf
    Univ Politecn Madrid, ETSI Telecomun, City Univ, E-28040 Madrid, Spain.;Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden..
    Martma, Tonu
    Tallinn Univ Technol, Inst Geol, EE-19086 Tallinn, Estonia..
    Moeller, Marco
    Rhein Westfal TH Aachen, Dept Geog, D-52056 Aachen, Germany..
    Pohjola, Veijo A.
    Uppsala Univ, Dept Earth Sci, S-75236 Uppsala, Sweden..
    Scherer, Dieter
    Tech Univ Berlin, Dept Ecol, D-12165 Berlin, Germany..
    Moore, John C.
    Univ Lapland, Arctic Ctr, Rovaniemi 96101, Finland.;Beijing Normal Univ, Coll Global Change, Beijing 100875, Peoples R China.;Beijing Normal Univ, Coll Earth Syst Sci, Beijing 100875, Peoples R China..
    SPATIAL AND TEMPORAL VARIABILITY OF NET ACCUMULATION FROM SHALLOW CORES FROM VESTFONNA ICE CAP (NORDAUSTLANDET, SVALBARD)2011Inngår i: Geografiska Annaler. Series A, Physical Geography, ISSN 0435-3676, E-ISSN 1468-0459, Vol. 93A, nr 4, s. 287-299Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    We analyse ice cores from Vestfonna ice cap (Nordaustlandet, Svalbard). Oxygen isotopic measurements were made on three firn cores (6.0, 11.0 and 15.5 m deep) from the two highest summits of the glacier located on the SWNE and NWSE central ridges. Sub-annual d18O cycles were preserved and could be counted visually in the uppermost parts of the cores, but deeper layers were affected by post-depositional smoothing. A pronounced d18O minimum was found near the bottom of the three cores. We consider candidates for this d18O signal to be a valuable reference horizon since it is also seen elsewhere in Nordaustlandet. We attribute it to isotopically depleted snow precipitation, which NCEP/NCAR reanalysis shows was unusual for Vestfonna, and came from northerly air during the cold winter of 1994/95. Finding the 1994/95 time marker allows establishment of a precise depth/age scale for the three cores. The derived annual accumulation rates indirectly fill a geographical gap in mass balance measurements and thus provide information on spatial and temporal variability of precipitation over the glacier for the period spanned by the cores (19922009). Comparing records at the two locations also reveals that the snow net accumulation at the easternmost part of Vestfonna was only half of that in the western part over the last 17 years.

  • 2.
    Moeller, Marco
    et al.
    Rhein Westfal TH Aachen, Dept Geog, D-52062 Aachen, Germany..
    Finkelnburg, Roman
    Tech Univ Berlin, Dept Ecol, D-12165 Berlin, Germany..
    Braun, Matthias
    Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA.;Univ Bonn, Ctr Remote Sensing Land Surfaces, D-5300 Bonn, Germany..
    Hock, Regine
    Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA.;Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden..
    Jonsell, Ulf
    Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden.;Univ Politecn Madrid, Escuela Tecn Super Ingenieros Telecomunicac, Madrid, Spain..
    Pohjola, Veijo A.
    Uppsala Univ, Dept Earth Sci, SE-75236 Uppsala, Sweden..
    Scherer, Dieter
    Tech Univ Berlin, Dept Ecol, D-12165 Berlin, Germany..
    Schneider, Christoph
    Rhein Westfal TH Aachen, Dept Geog, D-52062 Aachen, Germany..
    Climatic mass balance of the ice cap Vestfonna, Svalbard: A spatially distributed assessment using ERA-Interim and MODIS data2011Inngår i: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 116, artikkel-id F03009Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The ice cap Vestfonna in the northern Svalbard archipelago is one of the largest ice bodies of the European Arctic (similar to 2400 km(2)), but little is known about its mass balance. We model the climatic mass balance of the ice cap for the period September 2000 to August 2009 on a daily basis. Ablation is calculated by a spatially distributed temperature-radiation-index melt model. Air temperature forcing is provided by ERA-Interim data that is downscaled using data from an automatic weather station operated on the ice cap. Spatially distributed net shortwave radiation fluxes are obtained from standard trigonometric techniques combined with Moderate Resolution Imaging Spectroradiometer-based cloud cover and surface albedo information. Accumulation is derived from ERA-Interim precipitation data that are bias corrected and spatially distributed as a function of elevation. Refreezing is incorporated using the P(max) approach. Results indicate that mass balance years are characterized by short ablation seasons (June to August) and correspondingly longer accumulation periods (September to May). The modeled, annual climatic mass balance rate shows an almost balanced mean of -0.02 +/- 0.20 m w.e. yr(-1) (meters water equivalent per year) with an associated equilibrium line altitude of 383 +/- 54 m above sea level (mean +/- one standard deviation). The mean winter balance is +0.32 +/- 0.06 m w.e. yr(-1), and the mean summer balance -0.35 +/- 0.17 m w.e. yr(-1). Roughly one fourth of total surface ablation is retained by refreezing indicating that refreezing is an important component of the mass budget of Vestfonna.

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