Thomas Schellenberger

• Nuth, Christopher; Gilbert, Adrien; Köhler, Andreas; McNabb, Robert Whitfield; Schellenberger, Thomas; Sevestre, Heidi; Weidle, Christian; Girod, Luc Maurice Ramuntcho; Luckman, Adrian & Kääb, Andreas (2019). Dynamic vulnerability revealed in the collapse of an Arctic tidewater glacier. Scientific Reports.  ISSN 2045-2322.  9 . doi: 10.1038/s41598-019-41117-0
• Gong, Yongmei; Zwinger, Thomas; Åström, J.; Altena, Bas; Schellenberger, Thomas; Gladstone, Rupert & Moore, John C. (2018). Simulating the roles of crevasse routing of surface water and basal friction on the surge evolution of Basin 3, Austfonna ice cap. The Cryosphere.  ISSN 1994-0416.  12(5), s 1563- 1577 . doi: 10.5194/tc-12-1563-2018
• Solgaard, Anne; Messerli, Alexandra; Schellenberger, Thomas; Hvidberg, Christine; Grinsted, Aslak; Jackson, Miriam; Zwinger, Thomas; Karlsson, Nanna B & Dahl-Jensen, Dorthe (2018). Basal conditions at Engabreen, Norway, inferred from surface measurements and inverse modelling. Journal of Glaciology.  ISSN 0022-1430.  64(246), s 555- 567 . doi: 10.1017/jog.2018.45
• Winsvold, Solveig Havstad; Kääb, Andreas; Nuth, Christopher; Andreassen, Liss Marie; Van Pelt, Ward J.J. & Schellenberger, Thomas (2018). Using SAR satellite data time series for regional glacier mapping. The Cryosphere.  ISSN 1994-0416.  12(3), s 867- 890 . doi: 10.5194/tc-12-867-2018 Full text in Research Archive.
• Paul, Frank; Strozzi, Tazio; Schellenberger, Thomas & Kääb, Andreas (2017). The 2015 surge of hispar glacier in the karakoram. Remote Sensing.  ISSN 2072-4292.  9(9), s 1- 18 . doi: 10.3390/rs9090888 Full text in Research Archive.
• Strozzi, Tazio; Kääb, Andreas & Schellenberger, Thomas (2017). Frontal destabilization of Stonebreen, Edgeøya, Svalbard. The Cryosphere.  ISSN 1994-0416.  11, s 553- 566 . doi: 10.5194/tc-11-553-2017 Full text in Research Archive.
• Strozzi, Tazio; Paul, Frank; Wiesmann, Andreas; Schellenberger, Thomas & Kääb, Andreas (2017). Circum-arctic changes in the flow of glaciers and ice caps from satellite SAR data between the 1990s and 2017. Remote Sensing.  ISSN 2072-4292.  9(9) . doi: 10.3390/rs9090947 Full text in Research Archive.
• Schellenberger, Thomas; Van Wychen, Wesley; Copland, Luke; Kääb, Andreas & Gray, Laurence (2016). An Inter-Comparison of Techniques for Determining Velocities of Maritime Arctic Glaciers, Svalbard, Using Radarsat-2 Wide Fine Mode Data. Remote Sensing.  ISSN 2072-4292.  8(9)(785) . doi: 10.3390/rs8090785 Full text in Research Archive. Show summary

  Glacier dynamics play an important role in the mass balance of many glaciers, ice caps and ice sheets. In this study we exploit Radarsat-2 (RS-2) Wide Fine (WF) data to determine the surface speed of Svalbard glaciers in the winters of 2012/2013 and 2013/2014 using Synthetic Aperture RADAR (SAR) offset and speckle tracking. The RS-2 WF mode combines the advantages of the large spatial coverage of the Wide mode (150 × 150 km) and the high pixel resolution (9 m) of the Fine mode and thus has a major potential for glacier velocity monitoring from space through offset and speckle tracking. Faster flowing glaciers (1.95 m · d − 1 –2.55 m · d − 1 ) that are studied in detail are Nathorstbreen, Kronebreen, Kongsbreen and Monacobreen. Using our Radarsat-2 WF dataset, we compare the performance of two SAR tracking algorithms, namely the GAMMA Remote Sensing Software and a custom written MATLAB script (GRAY method) that has primarily been used in the Canadian Arctic. Both algorithms provide comparable results, especially for the faster flowing glaciers and the termini of slower tidewater glaciers. A comparison of the WF data to RS-2 Ultrafine and Wide mode data reveals the superiority of RS-2 WF data over the Wide mode data.

• Strozzi, Tazio; Kääb, Andreas & Schellenberger, Thomas (2016). Frontal destabilisation of Stonebreen, Edgeøya, Svalbard. The Cryosphere Discussions.  ISSN 1994-0432. . doi: 10.5194/tc-2016-213 Show summary

  In consideration of the strong atmospheric warming that has been observed since the 1990s in polar regions there is a need to quantify ice mass loss of Arctic ice caps and glaciers and their contribution to sea level rise. In polar regions a large part of glacier ablation is through calving of tidewater glaciers driven by ice velocities and their variations. The Svalbard region is characterized by glaciers with rapid dynamic fluctuations of different types, including irreversible adjustments of calving fronts to a changing mass balance and reversible, surge-type activities. For large areas, however, we don't have much past and current information on glacier's dynamic fluctuations. Recently, through frequent monitoring based on repeat optical and SAR satellite data, a number of zones of speed increases have been observed at formerly slow-flowing calving fronts on Svalbard. Here we present the dynamic evolution of the southern lobe of Stonebreen on Edgeøya. We observe a slowly steady retreat of the glacier front from 1971 until 2011 followed since 2012 by a strong increase in ice surface velocity along with a decrease of volume and an advance in frontal extension. The considerable losses in ice thickness could have made the tide-water calving glacier, which is grounded below sea level some 6 km inland from the 2014 front, more sensitive to surface melt-water reaching its bed and/or warm ocean water increasing frontal ablation with subsequent strong multi-annual ice-flow acceleration

• Dunse, Thorben; Schellenberger, Thomas; Hagen, Jon Ove Methlie; Kääb, Andreas; Schuler, Thomas Vikhamar & Reijmer, Carleen (2015). Glacier-surge mechanisms promoted by a hydro-thermodynamic feedback to summer melt. The Cryosphere.  ISSN 1994-0416.  9, s 197- 215 . doi: 10.5194/tc-9-197-2015 Full text in Research Archive.
• Schellenberger, Thomas; Dunse, Thorben; Kääb, Andreas; Kohler, Jack & Reijmer, Carleen (2015). Surface speed and frontal ablation of Kronebreen and Kongsbreen, NW Svalbard, from SAR offset tracking. The Cryosphere.  ISSN 1994-0416.  9, s 2339- 2355 . doi: 10.5194/tc-9-2339-2015
• Dunse, Thorben; Schellenberger, Thomas; Hagen, Jon Ove Methlie; Kääb, Andreas; Schuler, Thomas & Reijmer, CH (2014). Destabilisation of an Arctic ice cap triggered by a hydro-thermodynamic feedback to summer-melt. The Cryosphere Discussions.  ISSN 1994-0432.  8, s 2685- 2719 . doi: 10.5194/tcd-8-2685-2014 Full text in Research Archive.
• Schellenberger, Thomas; Dunse, Thorben; Kääb, Andreas; Kohler, Jack & Reijmer, Carleen (2014). Surface speed and frontal ablation of Kronebreen and Kongsbreen, NW-Svalbard, from SAR offset tracking. The Cryosphere Discussions.  ISSN 1994-0432.  8, s 6193- 6233 . doi: 10.5194/tcd-8-6193-2014 Full text in Research Archive.
• Notarnicola, Claudia; Duguay, Martial; Moelg, Nico; Schellenberger, Thomas; Tetzlaff, Anke; Monsorno, Roberto; Costa, Armin; Steurer, Christian & Zebisch, Marc (2013). Snow Cover Maps from MODIS Images at 250 m Resolution, Part 1: Algorithm Description. Remote Sensing.  ISSN 2072-4292.  5(1), s 110- 126 . doi: 10.3390/rs5010110
• Notarnicola, Claudia; Duguay, Martial; Moelg, Nico; Schellenberger, Thomas; Tetzlaff, Anke; Monsorno, Roberto; Costa, Armin; Steurer, Christian & Zebisch, Marc (2013). Snow Cover Maps from MODIS Images at 250 m Resolution, Part 2: Validation. Remote Sensing.  ISSN 2072-4292.  5(4), s 1568- 1587 . doi: 10.3390/rs5041568

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• Altena, Bas; Schellenberger, Thomas & Kääb, Andreas (2019). Bringing together remote sensing data to produce region-wide glacier velocities. Show summary

  The recent increase of medium resolution satellite programs that consistently senses the Earth surface has brought great potential for glaciology. Satellites like the Sentinel-1&2 tandems, Landsat 7&8 duo and Rapideye constellation sense mountain ranges almost without missing a day. Consequently, high resolution time-series can be constructed, for snow-cover or crack propagation, or other single scene information. Properties derived from combinations of acquisitions, such as, glacier velocity is more challenging. Velocity estimation is based upon image matching, which can be hindered by coherence loss or cloud cover. Consequently, generated velocity data have gaps and have scattered coverage at different time intervals. This steady data stream has resulted in several initiatives to use image matching techniques in batch processing mode. Resulting in glacier velocity services being set-up (e.g.: cryoportal, GoLIVE, Geodetic data portal), but these initiatives are satellite specific. If such products are merged it is possible to increase temporal and spatial coverage and increase the reliability of the velocity estimates. We developed such a workflow that merges glacier velocity products of different time spans and type. This combined dataset covers several mountain ranges and has a regular time step at a monthly pace. This consistent time-series make it possible to observe glacier dynamics that are of short nature. As the satellite recordings already span several years, the dynamics of tidewater glaciers or (partial) surges can be observed and analyzed. This study therefor shows the great potential of bringing together different satellite systems.

• Nuth, Christopher; Kohler, Jack; Köhler, Andreas; Lefeuvre, Pierre-Marie; Schuler, Thomas; Van Pelt, Ward; Schellenberger, Thomas; Kääb, Andreas; Deschamps-Berger, Cesar; Berthier, Etienne; Lauknes, Tom Rune; Strozzi, Tazio & Petlicki, Michal (2018). The different dynamic personalities of two neighboring tidewater glaciers.
• Gong, Yongmei; Zwinger, Thomas; Åström, Jan A.; Altena, Bas; Schellenberger, Thomas; Gladstone, Rupert M & Moore, John (2017). Basal friction evolution and crevasse distribution during the surge in Basin-3, Austfonna ice-cap - offline coupling between a continuum ice dynamic model and a discrete element model.
• Schellenberger, Thomas; Dunse, Thorben; Kääb, Andreas; Schuler, Thomas; Hagen, Jon Ove Methlie & Reijmer, Carleen (2017). Multi-year surface velocities and sea-level rise contribution of the Basin-3 and Basin-2 surges, Austfonna, Svalbard.
• Schellenberger, Thomas; Van Wychen, Wesley; Copland, Luke; Kääb, Andreas & Gray, Laurence (2017). Glacier surface velocities of the Svalbard Archipelago.
• Kääb, Andreas; Treichler, Désirée Silvana; Girod, Luc Maurice Ramuntcho; Lefeuvre, Pierre-Marie; Schellenberger, Thomas; Altena, Bas; Jonassen, Vetle; Nuth, Christopher; McNabb, Robert Whitfield & Gilbert, Adrien (2016). On the Karakoram anomaly.
• Altena, Bas; Dunse, Thorben & Schellenberger, Thomas (2016). Crevasse evolution of Basin-3 during its speed-up.
• Schellenberger, Thomas; Dunse, Thorben; Kääb, Andreas; Schuler, Thomas; Hagen, Jon Ove Methlie & Reijmer, Carleen (2016). The surge must go on: extended surface velocity time series and frontal ablation estimates of Basin-3 (and Basin-2), NE-Svalbard.
• Solgaard, Anne; Messerli, Alexandra; Grinsted, Aslak; Schellenberger, Thomas; Hvidberg, Christine; Karlson, Nanna; Jackson, Miriam; Zwinger, Thomas & Dahl-Jensen, Dorthe (2016). Engabreen Basal Conditions from Surface Measurements.
• Winsvold, Solveig Havstad; Kääb, Andreas; Nuth, Christopher; Andreassen, Liss Marie; Van Pelt, Ward & Schellenberger, Thomas (2016). Regional glacier mapping by combination of dense optical and SAR satellite image time-series.
• Winsvold, Solveig Havstad; Kääb, Andreas; Nuth, Christopher; Van Pelt, Ward J.J.; Andreassen, Liss Marie & Schellenberger, Thomas (2016). Glacier mapping using combined optical and SAR time-series.
• Dunse, Thorben; Schellenberger, Thomas; Hagen, Jon Ove Methlie; Kääb, Andreas; Schuler, Thomas & Reijmer, Carleen (2015). A surge of the Austfonna ice cap, Svalbard, promoted by a hydro-thermodynamic feedback to summer melt.
• Gong, Yongmei; Schellenberger, Thomas; Zwinger, Thomas & Moore, John C. (2015). Observation and model study of terminus initiated surging in southern Basin 3, Austfonna ice cap, Svalbard.
• Girod, Luc Maurice Ramuntcho; Nuth, Christopher & Schellenberger, Thomas (2014). Structure from motion, a low cost, very high resolution method for surveying glaciers using GoPros and opportunistic helicopter flights.
• Schellenberger, Thomas; Dunse, Thorben; Kääb, Andreas & Kohler, Jack (2014). Velocity variations and calving flux of Kronebreen, NW-Svalbard from SAR offset tracking.
• Dunse, Thorben; Schellenberger, Thomas; Hagen, Jon Ove Methlie; Kääb, Andreas; Schuler, Thomas & Reijmer, Carleen (2013). On a major surge of Austfonna.
• Kääb, Andreas; Schellenberger, Thomas & Dunse, Thorben (2013). A large glacier surge on Austfonna, Svalbard, from TerraSAR-X offset tracking.
• Nuth, Christopher; Kohler, Jack; Schellenberger, Thomas; Schuler, Thomas; Kääb, Andreas & Hagen, Jon Ove Methlie (2013). Combining remote sensing and surface mass balance observations/modeling to partition mass changes of Kronebreen, northwest Svalbard.
• Van Wychen, Wesley; Schellenberger, Thomas; Copland, Luke; Kääb, Andreas & Gray, Laurence (2013). An inter-comparison of techniques for determining glacier velocities over Svalbard.
• Schellenberger, Thomas; Heid, Torborg; Dunse, Thorben; Nuth, Christopher; Kohler, Jack; Hagen, Jon Ove Methlie & Kääb, Andreas (2012). Calving flux of Svalbards tidewater glaciers estimated from remote sensing-based surface velocities.
• Schellenberger, Thomas; Heid, Torborg; Dunse, Thorben; Nuth, Christopher; Reijmer, Carleen; Kohler, Jack; Hagen, Jon Ove Methlie & Kääb, Andreas (2012). Calving flux of Svalbards tidewater glaciers estimated from remote sensing-based surface velocities.

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