Blar i Bergen Open Research Archive på forfatter "Dahl, Svein Olaf"
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Automated classification of debris-covered glaciers combining optical, SAR and topographic data in an object-based environment
Robson, Benjamin Aubrey; Nuth, Christopher; Dahl, Svein Olaf; Hölbling, Daniel; Strozzi, Tazio; Nielsen, Pål Ringkjøb (Peer reviewed; Journal article, 2015-12)Satellite imagery is increasingly used to monitor glacier area changes and create glacier inventories. Robust and efficient pixel-based band ratios have proven to be accurate for automatically delineating clean glacier ... -
Decadal Scale Changes in Glacier Area in the Hohe Tauern National Park (Austria) Determined by Object-Based Image Analysis
Robson, Benjamin Aubrey; Hölbling, Daniel; Nuth, Christopher; Strozzi, Tazio; Dahl, Svein Olaf (Peer reviewed; Journal article, 2016-01-15)In this paper, we semi-automatically classify clean and debris-covered ice for 145 glaciers within Hohe Tauern National Park in the Austrian Alps for the years 1985, 2003, and 2013. We also map the end-summer transient ... -
Holocene debris flows recognized in a lacustrine sedimentary succession: sedimentology, chronostratigraphy and cause of triggering
Sletten, K.; Blikra, Lars Harald; Ballantyne, C. K.; Nesje, Atle; Dahl, Svein Olaf (Peer reviewed; Journal article, 2003)This study focuses on the sedimentary characteristics and the chronostratigraphy of Holocene massflow deposits recognized in a lake-fill sedimentary succession. These deposits in lake Ulvådalsvatnet, western Norway, are ... -
Holocene palaeoclimate reconstructions at Vanndalsvatnet, western Norway, with particular reference to the 8200 cal. yr BP event
Nesje, Atle; Bjune, Anne Elisabeth; Bakke, Jostein; Dahl, Svein Olaf; Lie, Øyvind; Birks, Harry John Betteley (Peer reviewed; Journal article, 2006)Analyses of organic content, magnetic susceptibility, grain size and pollen in sediments from the proglacial lake Vanndalsvatnet in western Norway provide a high-resolution terrestrial record and pollenbased quantitative ... -
Late Holocene surface ocean conditions of the Norwegian Sea (Vøring Plateau)
Andersson, Carin; Risebrobakken, Bjørg; Jansen, Eystein; Dahl, Svein Olaf (Peer reviewed; Journal article, 2003-06-04)Late Holocene sea surface ocean conditions of the eastern Norwegian Sea (Vøring Plateau) are inferred from planktic stable isotopes and planktic foraminiferal assemblage changes in cores JM97-948/2A and MD95-2011 (66.97°N, ... -
The 'Little Ice Age' – only temperature?
Nesje, Atle; Dahl, Svein Olaf (Peer reviewed; Journal article, 2003)Understanding the climate of the last few centuries, including the 'Little Ice Age', may help us better understand modern-day natural climate variability and make climate predictions. The conventional view of the climate ... -
A preboreal elk (Alces alces L., 1758) antler from south-eastern Norway
Grøndahl, Finn Audun; Hufthammer, Anne Karin; Dahl, Svein Olaf; Rosvold, Jørgen (Peer reviewed; Journal article, 2010)In 1895 a shed elk antler was found in a mire on a farm near Fluberg, in Søndre Land municipality in south-eastern Norway. The antler was first radiocarbon dated in 2008 and yielded the age 9,100 ± 50 BP (8,340 – 8,250 ... -
Reconstruction of former glacier equilibrium-line altitudes based on proglacial sites: an evaluation of approaches and selection of sites
Dahl, Svein Olaf; Bakke, Jostein; Lie, Øyvind; Nesje, Atle (Quaternary Science Reviews; 22(2/4), Journal article, 2003)Various approaches are used to record variations in glacier activity and equilibrium-line altitudes (ELAs) based on proglacial sites (lacustrine and terrestrial). These approaches are based on a conceptual model of ... -
Spatial Variability in Patterns of Glacier Change across the Manaslu Range, Central Himalaya
Robson, Benjamin Aubrey; Nuth, Christopher; Nielsen, Pål Ringkjøb; Girod, Luc Maurice Ramuntcho; Hendrick, Marijn; Dahl, Svein Olaf (Peer reviewed; Journal article, 2018-02-13)This study assesses changes in glacier area, velocity, and geodetic mass balance for the glaciers in the Manaslu region of Nepal, a previously undocumented region of the Himalayas. We studied changes between 1970 (for ... -
Spring-summer temperature reconstruction in western Norway 1734-2003: a data-synthesis approach
Nordli, Øyvind; Lie, Øyvind; Nesje, Atle; Dahl, Svein Olaf (Peer reviewed; Journal article, 2003-12-16)A series of spring–summer (April–August) temperatures was reconstructed for the period 1734–1923 for western Norway based on multi-proxy data. For the period 1734–1842 the long-term variations were based on terminal moraines ... -
A theoretical approach to glacier equilibrium-line altitudes using meteorological data and glacier massbalance
Lie, Øyvind; Dahl, Svein Olaf; Nesje, Atle (Peer reviewed; Journal article, 2003-05-01)Based on a close exponential relationship between mean ablation-season temperature and winter precipitation at the equilibrium-line altitude (ELA) of 10 Norwegian glaciers, three equations are derived. The first equation ... -
Theoretical equilibrium-line altitudes and glacier buildup sensitivity in southern Norway based on meteorological data in a geographical information system
Lie, Øyvind; Dahl, Svein Olaf; Nesje, Atle (Peer reviewed; Journal article, 2003-05-01)Three equations derived from a close exponential glacier-climate relationship at the equilibrium-line altitude (ELA) of Norwegian glaciers have been utilized and implemented in a geographical information system (GIS). The ...