A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis
Jordan R. Mertes acknowledges funding from Michigan Technological University and The Michigan Technological University 2016 Fall Finishing Fellowship. Sarah S. Thompson acknowledges funding from the University Centre in Svalbard (UNIS) and the European Commission FP7-MC-IEF. Supra-glacial lakes and...
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Online Access: | http://hdl.handle.net/10023/12193 https://doi.org/10.1002/esp.4068 |
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ftstandrewserep:oai:research-repository.st-andrews.ac.uk:10023/12193 2023-07-02T03:32:20+02:00 A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis Mertes, Jordan R. Thompson, Sarah S. Booth, Adam D. Gulley, Jason D. Benn, Douglas I. University of St Andrews. Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute 2017-11-29 12 application/pdf http://hdl.handle.net/10023/12193 https://doi.org/10.1002/esp.4068 eng eng Earth Surface Processes and Landforms Mertes , J R , Thompson , S S , Booth , A D , Gulley , J D & Benn , D I 2017 , ' A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis ' , Earth Surface Processes and Landforms , vol. 42 , no. 6 , pp. 903-914 . https://doi.org/10.1002/esp.4068 0197-9337 PURE: 248683805 PURE UUID: f713175f-fee1-41fd-9c45-3045a8c20e5d Scopus: 85006097384 WOS: 000400646100005 ORCID: /0000-0002-3604-0886/work/64697380 http://hdl.handle.net/10023/12193 https://doi.org/10.1002/esp.4068 Copyright © 2016, John Wiley & Sons, Ltd. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1002/esp.4068 Debris-covered glaciers Facies analysis Ground penetrating radar Supra-glacial lakes GE Environmental Sciences Geography Planning and Development Earth-Surface Processes Earth and Planetary Sciences (miscellaneous) NDAS GE Journal article 2017 ftstandrewserep https://doi.org/10.1002/esp.4068 2023-06-13T18:29:52Z Jordan R. Mertes acknowledges funding from Michigan Technological University and The Michigan Technological University 2016 Fall Finishing Fellowship. Sarah S. Thompson acknowledges funding from the University Centre in Svalbard (UNIS) and the European Commission FP7-MC-IEF. Supra-glacial lakes and ponds can create hotspots of mass loss on debris-covered glaciers. While much research has been directed at understanding lateral lake expansion, little is known about the rates or processes governing lake deepening. To a large degree, this knowledge gap persists due to sparse observations of lake beds. Here we report on the novel use of ground penetrating radar (GPR) surveys to simultaneously collect supra-glacial lake bathymetry and bottom composition data from Spillway Lake (surface area of 2.4 × 105m2; volume of 9.5 × 104m3), which is located in the terminus region of the Ngozumpa Glacier in the Khumbu region of the Nepal Himalaya. We identified two GPR bottom signals corresponding to two sedimentary facies of (1) sub-horizontal layered fine sediment drape and (2) coarse blocky diamict. We provide an understanding of the changes in subaqueous debris distribution that occur through stages of lake expansion by combining the GPR results with in situ observations of shoreline deposits matching the interpreted facies. From this, we present an updated conceptual model of supra-glacial lake evolution, with the addition of data on the evolving debris environment, showing how dominant depositional processes can change as lakes evolve from perched lakes to multi-basin base-level lakes and finally onto large moraine-dammed lakes. Throughout lake evolution, processes such as shoreline steepening, lakebed collapse into voids and conduit interception, subaerial and subaqueous calving and rapid areal expansion alter the spatial distribution and makeup of lakebed debris and sediments forcing a number of positive and negative feedbacks on lake expansion. Postprint Peer reviewed Article in Journal/Newspaper glacier Svalbard UNIS University Centre in Svalbard University of St Andrews: Digital Research Repository Glacial Lake ENVELOPE(-129.463,-129.463,58.259,58.259) Svalbard Earth Surface Processes and Landforms 42 6 903 914 |
institution |
Open Polar |
collection |
University of St Andrews: Digital Research Repository |
op_collection_id |
ftstandrewserep |
language |
English |
topic |
Debris-covered glaciers Facies analysis Ground penetrating radar Supra-glacial lakes GE Environmental Sciences Geography Planning and Development Earth-Surface Processes Earth and Planetary Sciences (miscellaneous) NDAS GE |
spellingShingle |
Debris-covered glaciers Facies analysis Ground penetrating radar Supra-glacial lakes GE Environmental Sciences Geography Planning and Development Earth-Surface Processes Earth and Planetary Sciences (miscellaneous) NDAS GE Mertes, Jordan R. Thompson, Sarah S. Booth, Adam D. Gulley, Jason D. Benn, Douglas I. A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis |
topic_facet |
Debris-covered glaciers Facies analysis Ground penetrating radar Supra-glacial lakes GE Environmental Sciences Geography Planning and Development Earth-Surface Processes Earth and Planetary Sciences (miscellaneous) NDAS GE |
description |
Jordan R. Mertes acknowledges funding from Michigan Technological University and The Michigan Technological University 2016 Fall Finishing Fellowship. Sarah S. Thompson acknowledges funding from the University Centre in Svalbard (UNIS) and the European Commission FP7-MC-IEF. Supra-glacial lakes and ponds can create hotspots of mass loss on debris-covered glaciers. While much research has been directed at understanding lateral lake expansion, little is known about the rates or processes governing lake deepening. To a large degree, this knowledge gap persists due to sparse observations of lake beds. Here we report on the novel use of ground penetrating radar (GPR) surveys to simultaneously collect supra-glacial lake bathymetry and bottom composition data from Spillway Lake (surface area of 2.4 × 105m2; volume of 9.5 × 104m3), which is located in the terminus region of the Ngozumpa Glacier in the Khumbu region of the Nepal Himalaya. We identified two GPR bottom signals corresponding to two sedimentary facies of (1) sub-horizontal layered fine sediment drape and (2) coarse blocky diamict. We provide an understanding of the changes in subaqueous debris distribution that occur through stages of lake expansion by combining the GPR results with in situ observations of shoreline deposits matching the interpreted facies. From this, we present an updated conceptual model of supra-glacial lake evolution, with the addition of data on the evolving debris environment, showing how dominant depositional processes can change as lakes evolve from perched lakes to multi-basin base-level lakes and finally onto large moraine-dammed lakes. Throughout lake evolution, processes such as shoreline steepening, lakebed collapse into voids and conduit interception, subaerial and subaqueous calving and rapid areal expansion alter the spatial distribution and makeup of lakebed debris and sediments forcing a number of positive and negative feedbacks on lake expansion. Postprint Peer reviewed |
author2 |
University of St Andrews. Geography & Sustainable Development University of St Andrews. Bell-Edwards Geographic Data Institute |
format |
Article in Journal/Newspaper |
author |
Mertes, Jordan R. Thompson, Sarah S. Booth, Adam D. Gulley, Jason D. Benn, Douglas I. |
author_facet |
Mertes, Jordan R. Thompson, Sarah S. Booth, Adam D. Gulley, Jason D. Benn, Douglas I. |
author_sort |
Mertes, Jordan R. |
title |
A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis |
title_short |
A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis |
title_full |
A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis |
title_fullStr |
A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis |
title_full_unstemmed |
A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis |
title_sort |
conceptual model of supra-glacial lake formation on debris-covered glaciers based on gpr facies analysis |
publishDate |
2017 |
url |
http://hdl.handle.net/10023/12193 https://doi.org/10.1002/esp.4068 |
long_lat |
ENVELOPE(-129.463,-129.463,58.259,58.259) |
geographic |
Glacial Lake Svalbard |
geographic_facet |
Glacial Lake Svalbard |
genre |
glacier Svalbard UNIS University Centre in Svalbard |
genre_facet |
glacier Svalbard UNIS University Centre in Svalbard |
op_relation |
Earth Surface Processes and Landforms Mertes , J R , Thompson , S S , Booth , A D , Gulley , J D & Benn , D I 2017 , ' A conceptual model of supra-glacial lake formation on debris-covered glaciers based on GPR facies analysis ' , Earth Surface Processes and Landforms , vol. 42 , no. 6 , pp. 903-914 . https://doi.org/10.1002/esp.4068 0197-9337 PURE: 248683805 PURE UUID: f713175f-fee1-41fd-9c45-3045a8c20e5d Scopus: 85006097384 WOS: 000400646100005 ORCID: /0000-0002-3604-0886/work/64697380 http://hdl.handle.net/10023/12193 https://doi.org/10.1002/esp.4068 |
op_rights |
Copyright © 2016, John Wiley & Sons, Ltd. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1002/esp.4068 |
op_doi |
https://doi.org/10.1002/esp.4068 |
container_title |
Earth Surface Processes and Landforms |
container_volume |
42 |
container_issue |
6 |
container_start_page |
903 |
op_container_end_page |
914 |
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1770271880216838144 |