Evolution of high-Arctic glacial landforms during deglaciation.
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 Lovénbreen, Svalbard. This work is of interest because glacial landforms developed in Svalbard have b...
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ftunivderby:oai:derby.openrepository.com:10545/622836 2023-05-15T14:23:41+02:00 Evolution of high-Arctic glacial landforms during deglaciation. Midgley, Nicholas G. Tonkin, Toby N. Graham, David, J. Cook, Simon J. Nottingham Trent University University of Derby Loughborough University University of Dundee 2018-03-29 http://hdl.handle.net/10545/622836 https://doi.org/10.1016/j.geomorph.2018.03.027 en eng Elsevier http://linkinghub.elsevier.com/retrieve/pii/S0169555X18301387 Midgley, N. G. et al (2018) 'Evolution of high-Arctic glacial landforms during deglaciation', Geomorphology, 311:63. 0169555X doi:10.1016/j.geomorph.2018.03.027 http://hdl.handle.net/10545/622836 Geomorphology Archived with thanks to Geomorphology Unmanned aerial vehicle (UAV) Structure-from-Motion (SfM) Ground-penetrating radar (GPR) Ice-cored moraine Svalbard Glaciers Article 2018 ftunivderby https://doi.org/10.1016/j.geomorph.2018.03.027 2020-09-04T06:43:34Z 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 Lovénbreen, 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 Lovénbreen 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. Nottingham Trent University Article in Journal/Newspaper Arctic Arctic glacier Svalbard UDORA - The University of Derby Online Research Archive Arctic Svalbard Geomorphology 311 63 75 |
institution |
Open Polar |
collection |
UDORA - The University of Derby Online Research Archive |
op_collection_id |
ftunivderby |
language |
English |
topic |
Unmanned aerial vehicle (UAV) Structure-from-Motion (SfM) Ground-penetrating radar (GPR) Ice-cored moraine Svalbard Glaciers |
spellingShingle |
Unmanned aerial vehicle (UAV) Structure-from-Motion (SfM) Ground-penetrating radar (GPR) Ice-cored moraine Svalbard Glaciers Midgley, Nicholas G. Tonkin, Toby N. Graham, David, J. Cook, Simon J. Evolution of high-Arctic glacial landforms during deglaciation. |
topic_facet |
Unmanned aerial vehicle (UAV) Structure-from-Motion (SfM) Ground-penetrating radar (GPR) Ice-cored moraine Svalbard Glaciers |
description |
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 Lovénbreen, 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 Lovénbreen 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. Nottingham Trent University |
author2 |
Nottingham Trent University University of Derby Loughborough University University of Dundee |
format |
Article in Journal/Newspaper |
author |
Midgley, Nicholas G. Tonkin, Toby N. Graham, David, J. Cook, Simon J. |
author_facet |
Midgley, Nicholas G. Tonkin, Toby N. Graham, David, J. Cook, Simon J. |
author_sort |
Midgley, Nicholas G. |
title |
Evolution of high-Arctic glacial landforms during deglaciation. |
title_short |
Evolution of high-Arctic glacial landforms during deglaciation. |
title_full |
Evolution of high-Arctic glacial landforms during deglaciation. |
title_fullStr |
Evolution of high-Arctic glacial landforms during deglaciation. |
title_full_unstemmed |
Evolution of high-Arctic glacial landforms during deglaciation. |
title_sort |
evolution of high-arctic glacial landforms during deglaciation. |
publisher |
Elsevier |
publishDate |
2018 |
url |
http://hdl.handle.net/10545/622836 https://doi.org/10.1016/j.geomorph.2018.03.027 |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Arctic glacier Svalbard |
genre_facet |
Arctic Arctic glacier Svalbard |
op_relation |
http://linkinghub.elsevier.com/retrieve/pii/S0169555X18301387 Midgley, N. G. et al (2018) 'Evolution of high-Arctic glacial landforms during deglaciation', Geomorphology, 311:63. 0169555X doi:10.1016/j.geomorph.2018.03.027 http://hdl.handle.net/10545/622836 Geomorphology |
op_rights |
Archived with thanks to Geomorphology |
op_doi |
https://doi.org/10.1016/j.geomorph.2018.03.027 |
container_title |
Geomorphology |
container_volume |
311 |
container_start_page |
63 |
op_container_end_page |
75 |
_version_ |
1766296170592731136 |