Comparing Traditional Mass Balance Measurements with Long-term Volume Change Extracted from Topographical Maps: A Case Study of Storbreen Glacier in Jotunheimen, Norway, for the Period 1940-1997

Andreassen, Liss M.

doi:10.1111/j.0435-3676.1999.00076.x

Cited by 56 publications

(48 citation statements)

References 7 publications

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“…Four of the five years had a more negative summer balance than the mean of the reference period. The b s measured in 2006, 2002 and 2003 are the largest, second largest and fourth largest negative balances ever measured at the glacier, coinciding with three of the warmest summers measured in Norway since measurements began in 1876 (Andreassen andothers, 2005, 2007). The b w measured is lower than the mean of the reference period for four of the five years.…”

Section: Glacier-total Mass Balancementioning

confidence: 67%

A 5 year record of surface energy and mass balance from the ablation zone of Storbreen, Norway

et al. 2008

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Section: Glacier-total Mass Balancementioning

confidence: 67%

A 5 year record of surface energy and mass balance from the ablation zone of Storbreen, Norway

et al. 2008

Self Cite

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“…Over the past decades, it has become a standard procedure to check the (annual) glaciological with (decadal) volumetric mass balance methods, utilizing techniques such as topographic map comparison (e.g., Andreassen 1999;Conway et al 1999;Kuhn et al 1999;Hagg et al, 2004;Østrem and Haakensen, 1999), photogrammetry (e.g., Krimmel, 1999;Cox and March, 2005;Thibert et al, 2008;Haug et al, 2009;Huss et al, 2009;Fischer, 2010), global positioning systems (e.g., Hagen et al 1999, Miller andPelto 1999), or laser altimetry (e.g., Conway et al, 1999;Fischer, 2010;Echelmeyer et al, 1996;Sapiano et al, 1998;Geist and Stötter, 2007), the latter three references without direct comparison. It has become evident that a sound validation ideally is based on consistent data and procedures, and includes a sound assessment of stochastic and systematic uncertainties.…”

Section: Discussionmentioning

confidence: 99%

Reanalysis of multi-temporal aerial images of Storglaciären, Sweden (1959–99) – Part 2: Comparison of glaciological and volumetric mass balances

Zemp

Jansson²,

Holmlund³

et al. 2010

The Cryosphere

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Abstract.Seasonal glaciological mass balances have been measured on Storglaciären without interruption since 1945/46. In addition, aerial surveys have been carried out on a decadal basis since the beginning of the observation program. Early studies had used the resulting aerial photographs to produce topographic glacier maps with which the in-situ observations could be verified. However, these maps as well as the derived volume changes are subject to errors which resulted in major differences between the derived volumetric and the glaciological mass balance. As a consequence, the original photographs were re-processed using uniform photogrammetric methods, which resulted in new volumetric mass balances for 1959-69, 1969-80, 1980-90, and 1990-99. We compared these new volumetric mass balances with mass balances obtained by standard glaciological methods including an uncertainty assessment considering all related previous studies. The absolute differences between volumetric and the glaciological mass balances are 0.8 m w.e. for the period of 1959-69 and 0.3 m w.e. or less for the other survey periods. These deviations are slightly reduced when considering corrections for systematic uncertainties due to differences in survey dates, reference areas, and internal ablation, whereas internal accumulation systematically increases the mismatch. However, the mean annual differences between glaciological and volumetric mass balance are less than the uncertainty of the in-situ stake reading and stochastic error bars of both data series overlap. Hence, no adjustment of the glaciological data series to the volumetric one is required.

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“…1). These maps are described in detail in Andreassen (1999), Andreassen et al (2002) and Haakensen (1986). Here, these data were used for comparison with the N50 data constructed by Statens Kartverk.…”

Section: Digital Glacier Outlines 2004mentioning

confidence: 99%

“…: 1940, 1951, 1968, 1984 and 1997, N50; 1981 and L2003. b) Area of Storbreen calculated from the glacier maps (Andreassen, 1999) : 1940, 1951, 1968, 1984 and 1997, N50; 1981 and L2003. and seasonal snow or debris-covered ice.…”

Section: Uncertainties In Area Assessmentsmentioning

confidence: 99%

Landsat-derived glacier inventory for Jotunheimen, Norway, and deduced glacier changes since the 1930s

et al. 2008

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Abstract.A Landsat Thematic Mapper (TM) scene from 2003 covering the Jotunheimen and Breheimen region has been used to map the recent glacier extents using thresholded ratio images (TM3/TM5). Orthoprojected aerial photographs and glacier outlines from digital maps have been used to validate the method and control the results. We further calculated glacier changes by comparing the Landsat-derived 2003 glacier outlines with previous maps and inventories from the 1930s, 1960s and 1980s. Our results confirm that the applied automatic mapping method is robust and agrees with the reference data used. Some manual editing was necessary to correct the outline at ice-lake contacts and at debris covered glaciers. However, for most of the glaciers no corrections were required. The most laborious task has been to assign ID numbers and couple the new Landsat inventory to previous inventories to assess area changes. The glaciers investigated shrank since the 1930s with an overall area reduction of about 23% for 38 glaciers. Since the 1960s the area reduction was 12% for 164 glaciers. Although the general trend is glacier recession, some glaciers have increased their size or remained nearly unchanged over these decades.

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Comparing Traditional Mass Balance Measurements with Long-term Volume Change Extracted from Topographical Maps: A Case Study of Storbreen Glacier in Jotunheimen, Norway, for the Period 1940-1997

Cited by 56 publications

References 7 publications

A 5 year record of surface energy and mass balance from the ablation zone of Storbreen, Norway

A 5 year record of surface energy and mass balance from the ablation zone of Storbreen, Norway

Reanalysis of multi-temporal aerial images of Storglaciären, Sweden (1959–99) – Part 2: Comparison of glaciological and volumetric mass balances

Landsat-derived glacier inventory for Jotunheimen, Norway, and deduced glacier changes since the 1930s

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