Blar i Bergen Open Research Archive på forfatter "Smith-Johnsen, Silje"
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Dynamics of the Northeast Greenland Ice Stream: the role of geothermal heat and subglacial hydrology
Smith-Johnsen, Silje (Doctoral thesis, 2019-11-15)Ice streams are rivers of fast flowing ice, crucial for the mass balance of ice sheets. The Greenland Ice Sheet shows a complex flow pattern, where a few major ice streams drain most of the ice sheet, contributing to sea ... -
Exceptionally high heat flux needed to sustain the Northeast Greenland Ice Stream
Smith-Johnsen, Silje; de Fleurian, Basile; Schlegel, Nicole; Seroussi, Hélène; Nisancioglu, Kerim Hestnes (Journal article; Peer reviewed, 2020)The Northeast Greenland Ice Stream (NEGIS) currently drains more than 10 % of the Greenland Ice Sheet area and has recently undergone significant dynamic changes. It is therefore critical to accurately represent this feature ... -
The role of subglacial hydrology in ice streams with elevated geothermal heat flux
Smith-Johnsen, Silje; de Fleurian, Basile; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2020-02-10)The spatial distribution of geothermal heat flux (GHF) under ice sheets is largely unknown. Nonetheless, it is an important boundary condition in ice-sheet models, and suggested to control part of the complex surface ... -
Sensitivity of the Northeast Greenland Ice Stream to Geothermal Heat
Smith-Johnsen, Silje; Schlegel, Nicole; de Fleurian, Basile; Nisancioglu, Kerim Hestnes (Peer reviewed; Journal article, 2019-12-20)Recent observations of ice flow surface velocities have helped improve our understanding of basal processes on Greenland and Antarctica, though these processes still constitute some of the largest uncertainties driving ice ... -
Time-lapse techniques for surface velocity, front position and calving rate measurement of a fast-flowing tidewater glacier in Svalbard
Smith-Johnsen, Silje (Master thesis, 2015-05-31)Calving is the mechanical loss of icebergs from tidewater glaciers, responsible for 70% of the annual transfer of mass from the cryosphere to the ocean (van der Veen 1998a, 2002). To be able to correctly predict future ...