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  • 1.
    Braun, Matthias
    et al.
    Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA.;Univ Bonn, Ctr Remote Sensing Land Surfaces, D-53113 Bonn, Germany..
    Pohjola, Veijo A.
    Uppsala Univ, Dept Earth Sci Air Water & Landscape Sci, SE-75236 Uppsala, Sweden..
    Pettersson, Rickard
    Uppsala Univ, Dept Earth Sci Air Water & Landscape Sci, SE-75236 Uppsala, Sweden..
    Moeller, Marco
    Rhein Westfal TH Aachen, Dept Geog, D-52056 Aachen, Germany..
    Finkelnburg, Roman
    Tech Univ Berlin, Dept Ecol, D-12165 Berlin, Germany..
    Falk, Ulrike
    Univ Bonn, Ctr Remote Sensing Land Surfaces, D-53113 Bonn, Germany..
    Scherer, Dieter
    Tech Univ Berlin, Dept Ecol, D-12165 Berlin, Germany..
    Schneider, Christoph
    Rhein Westfal TH Aachen, Dept Geog, D-52056 Aachen, Germany..
    CHANGES OF GLACIER FRONTAL POSITIONS OF VESTFONNA (NORDAUSTLANDET, SVALBARD)2011Inngår i: Geografiska Annaler. Series A, Physical Geography, ISSN 0435-3676, E-ISSN 1468-0459, Vol. 93A, nr 4, s. 301-310Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Glaciers in Svalbard have shown considerable mass loss in recent years with a reported acceleration in the western and southern parts of the archipelago. However, for the ice cap Vestfonna, in northeastern Svalbard, climatic mass balance modelling has suggested almost balanced conditions over a period of nine years (20002009). A slightly positive geodetic mass balance (19902005) has been reported from a comparison of laser altimetry to older DEMs. A heterogeneous situation has been depicted for the various catchments, and hence changes in glacier extent can reveal additional information of glacier status, in particular when dealing with surge-type glaciers. We analysed a 34-year data record of multi-spectral satellite imagery in order to study changes in glacier frontal positions of the ice cap Vestfonna. A consistent pattern of almost steady retreat of the southern and north-eastern outlet glaciers of the ice cap is observed while Franklinbreen, the only major outlet glacier draining towards the north-west shows re-advance. This is consistent with an observed speed up and potential upcoming surge of this outlet. The glacier retreat on the southern coast also agrees with ICESat elevation change measurements. However, due to the glacier response time no direct relations between frontal retreat and surface mass balance can be drawn from the short observation period. The heterogeneous pattern of changes with on-going dynamic adjustments in some areas make the ice cap Vestfonna an ideal test site for future monitoring activities including novel techniques like differential interferometry from bi-static SAR systems.

  • 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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