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  • 1. Beedle, M.
    et al.
    Dyurgerov, Mark
    Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
    Tangborn, W.
    Khalsa, S.J.S.
    Helm, C.
    Raup, Bruce
    Armstrong, R.
    Barry, R.G.
    Improving estimation of glacier volume change: a GLIMS case study of Bering Glacier System, Alaska.2008In: The Cryosphere, ISSN 1994-0416, Vol. 2, no 1, p. 33-51Article in journal (Refereed)
    Abstract [en]

    The Global Land Ice Measurements from Space (GLIMS) project has developed tools and methods that can be employed by analysts to create accurate glacier outlines. To illustrate the importance of accurate glacier outlines and the effectiveness of GLIMS standards we conducted a case study on Bering Glacier System (BGS), Alaska. BGS is a complex glacier system aggregated from multiple drainage basins, numerous tributaries, and many accumulation areas. Published measurements of BGS surface area vary from 1740 to 6200 km2, depending on how the boundaries of this system have been defined. Utilizing GLIMS tools and standards we have completed a new outline (3630 km2) and analysis of the area-altitude distribution (hypsometry) of BGS using Landsat images from 2000 and 2001 and a US Geological Survey 15-min digital elevation model. We compared this new hypsometry with three different hypsometries to illustrate the errors that result from the widely varying estimates of BGS extent. The use of different BGS hypsometries results in highly variable measures of volume change and net balance (bn). Applying a simple hypsometry-dependent mass-balance model to different hypsometries results in a bn rate range of −1.0 to −3.1 m a−1 water equivalent (W.E.), a volume change range of −3.8 to −6.7 km3 a−1 W.E., and a near doubling in contributions to sea level equivalent, 0.011 mm a−1 to 0.019 mm a−1. Current inaccuracies in glacier outlines hinder our ability to correctly quantify glacier change. Understanding of glacier extents can become comprehensive and accurate. Such accuracy is possible with the increasing volume of satellite imagery of glacierized regions, recent advances in tools and standards, and dedication to this important task.

  • 2.
    de Woul, Mattias
    et al.
    Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
    Radic, Valentina
    Hock, Regine
    Dyurgerov, Mark
    Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
    Global glacier mass losses and mass balance sensitivities assessed from observations and gridded climate data.2008In: Workshop on mass balance measurements and modeling., 2008Conference paper (Other academic)
  • 3.
    Dyurgerov, M
    Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
    Glacier Monitoring approach suggested from analysis of mass balance observations2007In: The dynamics and mass budget of Arctic glaciers. IASC Working group on Arctic Glaciology, 2007Conference paper (Refereed)
  • 4. Meier, MF
    et al.
    Dyurgerov, M
    Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
    Rick, UK
    O’Neel, S
    Pfeffer, WT
    Anderson, RS
    Anderson, SP
    Glazovsky, AF
    Glaciers dominate eustatic sea-level rise in the 21st Century2007In: Science, Vol. 317, no 5841, p. 1064-1067Article in journal (Refereed)
    Abstract [en]

    Ice loss to the sea currently accounts for virtually all of the sea-level rise that is not attributable to ocean warming, and about 60% of the ice loss is from glaciers and ice caps rather than from the two ice sheets. The contribution of these smaller glaciers has accelerated over the past decade, in part due to marked thinning and retreat of marine-terminating glaciers associated with a dynamic instability that is generally not considered in mass-balance and climate modeling. This acceleration of glacier melt may cause 0.1 to 0.25 meter of additional sea-level rise by 2100.

  • 5. Steffen, K
    et al.
    Thomas, R
    Rignot, E
    Cogley, G
    Stockholm University, Faculty of Science, Department of Physical Geography and Quaternary Geology.
    Dyurgerov, M
    Raper, S
    Hanna, E
    Huybrechts, Ph
    Cryospheric contribution to sea level rise and variability: Uncertainties, measurements, potential improvements2007In: Understanding Sea-level Rise and Variability, Balkema , 2007Chapter in book (Refereed)
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