Evolution of high-Arctic glacial landforms during deglaciation

Abstract Glacial landsystems in the high-Arctic have been reported to undergo geomorphological transformation during deglaciation. This research evaluates moraine evolution over a decadal timescale at Midtre Lovenbreen, Svalbard. This work is of interest because glacial landforms developed in Svalbard have been used as an analogue for landforms developed during Pleistocene mid-latitude glaciation. Ground penetrating radar was used to investigate the subsurface characteristics of moraines. To determine surface change, a LiDAR topographic data set (obtained 2003) and a UAV-derived (obtained 2014) digital surface model processed using structure-from-motion (SfM) are also compared. Evaluation of these data sets together enables subsurface character and landform response to climatic amelioration to be linked. Ground penetrating radar evidence shows that the moraine substrate at Midtre Lovenbreen includes ice-rich (radar velocities of 0.17 m ns−1) and debris-rich (radar velocities of 0.1–0.13 m ns−1) zones. The ice-rich zones are demonstrated to exhibit relatively high rates of surface change (mean thresholded rate of −4.39 m over the 11-year observation period). However, the debris-rich zones show a relatively low rate of surface change (mean thresholded rate of −0.98 m over the 11-year observation period), and the morphology of the debris-rich landforms appear stable over the observation period. A complex response of proglacial landforms to climatic warming is shown to occur within and between glacier forelands as indicated by spatially variable surface lowering rates. Landform response is controlled by the ice-debris balance of the moraine substrate, along with the topographic context (such as the influence of meltwater). Site-specific characteristics such as surface debris thickness and glaciofluvial drainage are, therefore, argued to be a highly important control on surface evolution in ice-cored terrain, resulting in a diverse response of high-Arctic glacial landsystems to climatic amelioration. These results highlight that care is needed when assessing the long-term preservation potential of contemporary landforms at high-Arctic glaciers. A better understanding of ice-cored terrain facilitates the development of appropriate age and climatic interpretations that can be obtained from palaeo ice-marginal landsystems.

[1]  R. Benestad,et al.  Temperature and Precipitation Development at Svalbard 1900-2100 , 2011 .

[2]  L. Nicholson,et al.  Calculating ice melt beneath a debris layer using meteorological data , 2006, Journal of Glaciology.

[3]  D. Mercier,et al.  Temporal scales and deglaciation rhythms in a polar glacier margin, Baronbreen, Svalbard , 2008 .

[4]  R. Benestad,et al.  Modeling the temperature evolution of Svalbard permafrost during the 20th and 21st century , 2011 .

[5]  S. M. Jong,et al.  High-resolution monitoring of Himalayan glacier dynamics using unmanned aerial vehicles , 2014 .

[6]  M. Ewertowski.  Recent transformations in the high‐arctic glacier landsystem, ragnarbreen, svalbard , 2014 .

[7]  J. Hagen,et al.  ‘Little Ice Age’ glacier extent and subsequent retreat in Svalbard archipelago , 2017 .

[8]  Bernd Etzelmüller,et al.  Glacier-permafrost interaction in Arctic and alpine mountain environments with examples from southern Norway and Svalbard , 2005, Geological Society, London, Special Publications.

[9]  K. Kjær,et al.  Quantification of dead‐ice melting in ice‐cored moraines at the high‐Arctic glacier Holmströmbreen, Svalbard , 2007 .

[10]  J. Murton,et al.  Glacier–permafrost interactions: Processes, products and glaciological implications , 2012 .

[11]  T. N. Tonkin,et al.  Internal structure and significance of ice‐marginal moraine in the Kebnekaise Mountains, northern Sweden , 2017 .

[12]  M. Caffee,et al.  Tracking paraglacial sediment with cosmogenic 10 Be using an example from the northwest Scottish Highlands , 2018 .

[13]  J. Murton,et al.  Basal ice facies and supraglacial melt-out till of the Laurentide Ice Sheet, Tuktoyaktuk Coastlands, western Arctic Canada , 2005 .

[14]  G. Isachsen.  Exploration du nord-ouest du Spitsberg entreprise sous les auspices de S. A. S. le Prince de Monaco par la Mission Isachsen , 1912 .

[15]  D. Benn,et al.  Growth and drainage of supraglacial lakes on debris-mantled Ngozumpa Glacier, Khumbu Himal, Nepal , 2001, Journal of Glaciology.

[16]  D. Elliott,et al.  Sampling and Describing Glacier Ice , 2016 .

[17]  M. Hambrey,et al.  Moraine development at the high-arctic valley glacier Pedersenbreen, Svalbard , 1996 .

[18]  A. Lyså,et al.  Formation and disintegration of a high‐arctic ice‐cored moraine complex, Scott Turnerbreen, Svalbard , 2001 .

[19]  J. Brasington,et al.  Methodological sensitivity of morphometric estimates of coarse fluvial sediment transport , 2003 .

[20]  J. Kohler,et al.  Detection of buried ice and sediment layers in permafrost using multi-frequency Ground Penetrating Radar: A case examination on Svalbard , 2007 .

[21]  S. Lukas.  ‘A test of the englacial thrusting hypothesis of “hummocky” moraine formation: case studies from the northwest Highlands, Scotland’: Reply to comments , 2007 .

[22]  M. Osuch,et al.  Inter‐ and intra‐annual changes in air temperature and precipitation in western Spitsbergen , 2017 .

[23]  A. M. Curry,et al.  Paraglacial modification of slope form , 1999 .

[24]  N. G. Midgley,et al.  Moraine-mound formation by englacial thrusting: the Younger Dryas moraines of Cwm Idwal, North Wales , 2000, Geological Society, London, Special Publications.

[25]  A. Çiner,et al.  Late Pleistocene piedmont glaciations in the Eastern Mediterranean; insights from cosmogenic 36Cl dating of hummocky moraines in southern Turkey , 2015 .

[26]  Toby N. Tonkin,et al.  Ground-Control Networks for Image Based Surface Reconstruction: An Investigation of Optimum Survey Designs Using UAV Derived Imagery and Structure-from-Motion Photogrammetry , 2016, Remote. Sens..

[27]  N. Glasser,et al.  Debris entrainment and transfer in polythermal valley glaciers , 1999, Journal of Glaciology.

[28]  R. Anderson,et al.  Interpreting exposure ages from ice‐cored moraines: a Neoglacial case study on Baffin Island, Arctic Canada , 2017 .

[29]  Toby N. Tonkin,et al.  Ice-cored moraine degradation mapped and quantified using an unmanned aerial vehicle: A case study from a polythermal glacier in Svalbard , 2016 .

[30]  Aleksandra M. Tomczyk,et al.  Quantification of the ice-cored moraines' short-term dynamics in the high-Arctic glaciers Ebbabreen and Ragnarbreen, Petuniabukta, Svalbard. , 2015 .

[31]  J. Brasington,et al.  Accounting for uncertainty in DEMs from repeat topographic surveys: improved sediment budgets , 2009 .

[32]  Tobias Bolch,et al.  Response of debris-covered glaciers in the Mount Everest region to recent warming, and implications for outburst flood hazards , 2012 .

[33]  Neil F. Glasser,et al.  The Role of Folding and Foliation Development in the Genesis of Medial Moraines: Examples from Svalbard Glaciers , 2003, The Journal of Geology.

[34]  N. Barrand,et al.  Recent High-Arctic glacial sediment redistribution: A process perspective using airborne lidar , 2011 .

[35]  A. Schomacker.  What controls dead-ice melting under different climate conditions? , 2008 .

[36]  I. Lønne,et al.  Deglaciation dynamics following the Little Ice Age on Svalbard: Implications for shaping of landscapes at high latitudes , 2005 .

[37]  J. Knight,et al.  Periglacial and paraglacial environments: a view from the past into the future , 2009 .

[38]  S. Winkler,et al.  Correlation of Late Quaternary moraines: impact of climate variability, glacier response, and chronological resolution , 2012 .

[39]  S. Fitzsimons.  Paraglacial redistribution of glacial sediments in the Vestfold Hills, East Antarctica , 1996 .

[40]  Brice R. Rea,et al.  GlaRe, a GIS tool to reconstruct the 3D surface of palaeoglaciers , 2016, Comput. Geosci..

[41]  N. Glasser,et al.  The landform and sediment assemblage produced by a tidewater glacier surge in Kongsfjorden, Svalbard , 1999 .

[42]  R. Wieler,et al.  The oldest ice on Earth in Beacon Valley, Antarctica: new evidence from surface exposure dating , 2000 .

[43]  N. Glasser,et al.  ‘A test of the englacial thrusting hypothesis of “hummocky” moraine formation: case studies from the northwest Highlands, Scotland’: Comments , 2007 .

[44]  M. Sharp.  Annual Moraine Ridges at Skàlafellsjökull, South-East Iceland , 1984, Journal of Glaciology.

[45]  Shi-yin Liu,et al.  Impact of varying debris cover thickness on ablation: a case study for Koxkar Glacier in the Tien Shan , 2014 .

[46]  J. Labadz,et al.  The potential of small unmanned aircraft systems and structure-from-motion for topographic surveys: A test of emerging integrated approaches at Cwm Idwal, North Wales , 2014 .

[47]  M. Oliva,et al.  Coupling patterns between para‐glacial and permafrost degradation responses in Antarctica , 2015 .

[48]  S. Lukas.  A test of the englacial thrusting hypothesis of ‘hummocky’ moraine formation: case studies from the northwest Highlands, Scotland , 2005 .

[49]  G. Østrem.  Ice Melting under a Thin Layer of Moraine, and the Existence of Ice Cores in Moraine Ridges , 1959 .

[50]  Nicholas R. J. Hulton,et al.  An ExcelTM spreadsheet program for reconstructing the surface profile of former mountain glaciers and ice caps , 2010, Comput. Geosci..

[51]  N. Glasser,et al.  Sedimentary and tectonic architecture of a large push moraine : a case study from Hagafellsjökull-Eystri, Iceland , 2004 .

[52]  I. Lønne,et al.  Moraine development at a small High‐Arctic valley glacier: Rieperbreen, Svalbard , 2001 .

[53]  Anshuman Bhardwaj,et al.  UAVs as remote sensing platform in glaciology: Present applications and future prospects , 2016 .

[54]  M. André,et al.  Paraglacial gullying of sediment‐mantled slopes: a case study of Colletthøgda, Kongsfjorden area, West Spitsbergen (Svalbard) , 2009 .

[55]  P. Zukowskyj,et al.  Paraglacial response of steep, sediment‐mantled slopes to post‐‘Little Ice Age’ glacier recession in the central Swiss Alps , 2006 .

[56]  Roberto Colombo,et al.  Rapid melting dynamics of an alpine glacier with repeated UAV photogrammetry , 2018 .

[57]  Toby N. Tonkin,et al.  Reconstruction of former glacier surface topography from archive oblique aerial images , 2017 .

[58]  Frank Paul,et al.  Global Glacier Change Bulletin No. 2 (2014-2015) , 2017 .

[59]  T. Murray,et al.  Structure and changing dynamics of a polythermal valley glacier on a centennial timescale : Midre Lovénbreen, Svalbard , 2005 .

[60]  Svein-Erik Hamran,et al.  The thermal regime of sub-polar glaciers mapped by multi-frequency radio-echo sounding , 1996 .

[61]  N. Glasser,et al.  Genesis of ‘hummocky moraines’ by thrusting in glacier ice: evidence from Svalbard and Britain , 1997, Journal of the Geological Society.

[62]  N. Glasser,et al.  Resedimentation of debris on an ice-cored lateral moraine in the high-Arctic (Kongsvegen, Svalbard) , 2000 .

[63]  Anshuman Bhardwaj,et al.  LiDAR remote sensing of the cryosphere: Present applications and future prospects , 2016 .

[64]  B. Devereux,et al.  Evaluating the potential of high‐resolution airborne LiDAR data in glaciology , 2006 .

[65]  M. Church,et al.  Paraglacial Sedimentation: A Consideration of Fluvial Processes Conditioned by Glaciation , 1972 .

[66]  O. Sass,et al.  The formation of Alpine lateral moraines inferred from sedimentology and radar reflection patterns: a case study from Gornergletscher, Switzerland , 2011 .

[67]  David J. A. Evans,et al.  Controlled moraines: origins, characteristics and palaeoglaciological implications , 2009 .

[68]  J. Tison,et al.  Preservation of Miocene glacier ice in East Antarctica , 1995, Nature.

[69]  Andrew Pomfret,et al.  High resolution mapping of supra‐glacial drainage pathways reveals link between micro‐channel drainage density, surface roughness and surface reflectance , 2015 .

[70]  Brice R. Rea,et al.  Using UAV acquired photography and structure from motion techniques for studying glacier landforms: application to the glacial flutes at Isfallsglaciären , 2017 .

[71]  Koji Fujita,et al.  Role of supraglacial ponds in the ablation process of a debris-covered glacier in the Nepal Himalayas , 2000 .

[72]  T. N. Tonkin,et al.  Origin, evolution and dynamic context of a Neoglacial lateral-frontal moraine at Austre Lovénbreen, Svalbard , 2013 .

[73]  G. Boulton.  Modern Arctic glaciers as depositional models for former ice sheets , 1972, Journal of the Geological Society.