Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory
Retrogressive thaw slumps are a common thermokarst landform in areas of ice-rich continuous permafrost characterized by large massive ground ice bodies, often several metres thick and hundreds of metres in extent. These features can retreat inland by as much as 15-20 metres annually (Figure 1) and a...
Main Authors: | , , , |
---|---|
Format: | Conference Object |
Language: | unknown |
Published: |
2016
|
Subjects: | |
Online Access: | https://epic.awi.de/id/eprint/41118/ https://hdl.handle.net/10013/epic.48704 |
id |
ftawi:oai:epic.awi.de:41118 |
---|---|
record_format |
openpolar |
spelling |
ftawi:oai:epic.awi.de:41118 2023-05-15T15:15:07+02:00 Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory Angelopoulos, Michael Pollard, Wayne Krautblatter, Michael Lantuit, Hugues 2016-06-23 https://epic.awi.de/id/eprint/41118/ https://hdl.handle.net/10013/epic.48704 unknown Angelopoulos, M. , Pollard, W. , Krautblatter, M. and Lantuit, H. orcid:0000-0003-1497-6760 (2016) Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory , ICOP 2016, Potsdam, Germany, 20 June 2016 - 24 June 2016 . hdl:10013/epic.48704 EPIC3ICOP 2016, Potsdam, Germany, 2016-06-20-2016-06-24 Conference notRev 2016 ftawi 2022-10-02T23:12:33Z Retrogressive thaw slumps are a common thermokarst landform in areas of ice-rich continuous permafrost characterized by large massive ground ice bodies, often several metres thick and hundreds of metres in extent. These features can retreat inland by as much as 15-20 metres annually (Figure 1) and are thus one of the most important carbon sources along Arctic coastlines. In locations like Herschel Island and the Yukon Coastal Plain, there are numerous active and stabilized thaw slumps (e.g. Lantuit and Pollard, 2008). In many cases, the new slumps form in the floor of a stabilized slump, leading to polycyclic thermokarst behaviour. Previous periods of thermokarst and retrogressive thaw slump activity can be identified morphologically and stratigraphically, as well as through changes in vegetation patterns (e.g. Cray and Pollard, 2015). Former slumps are usually marked by open vegetated depressions with a well-defined (low) head scarp that faces downslope. The headwall of an active slump provides natural permafrost exposures from which considerable cryostratigraphic information can be obtained. In the case of a polycyclic retrogressive thaw slump, the previous cycle of thermokarst is marked by a well-defined thaw unconformity and truncated structures (e.g. ice wedges) overlain by massive debris flow deposits containing blocks of organic material. However, the polycyclic nature of slumps and how one episode may impact another are not fully understood. The objectives of this project are to: 1) Visualize 3D landscape evolution changes related to polycyclic thermokarst for multiple slumps on Herschel Island from 2004 to 2013; and 2) Investigate and compare the polycyclic thermokarst behaviour between the slumps using a combination of cryostratigraphic, ground-penetrating radar, electrical resistivity, and biogeographic datasets of vegetation succession following disturbance (Cray and Pollard, 2015). The landscape evolution models are generated by comparing the annual headwall positions of the slumps (2004-2013) ... Conference Object Arctic Herschel Herschel Island Ice permafrost Thermokarst wedge* Yukon Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Herschel Island ENVELOPE(-139.089,-139.089,69.583,69.583) Low Head ENVELOPE(-58.133,-58.133,-62.150,-62.150) Pollard ENVELOPE(64.617,64.617,-70.467,-70.467) Yukon |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
Retrogressive thaw slumps are a common thermokarst landform in areas of ice-rich continuous permafrost characterized by large massive ground ice bodies, often several metres thick and hundreds of metres in extent. These features can retreat inland by as much as 15-20 metres annually (Figure 1) and are thus one of the most important carbon sources along Arctic coastlines. In locations like Herschel Island and the Yukon Coastal Plain, there are numerous active and stabilized thaw slumps (e.g. Lantuit and Pollard, 2008). In many cases, the new slumps form in the floor of a stabilized slump, leading to polycyclic thermokarst behaviour. Previous periods of thermokarst and retrogressive thaw slump activity can be identified morphologically and stratigraphically, as well as through changes in vegetation patterns (e.g. Cray and Pollard, 2015). Former slumps are usually marked by open vegetated depressions with a well-defined (low) head scarp that faces downslope. The headwall of an active slump provides natural permafrost exposures from which considerable cryostratigraphic information can be obtained. In the case of a polycyclic retrogressive thaw slump, the previous cycle of thermokarst is marked by a well-defined thaw unconformity and truncated structures (e.g. ice wedges) overlain by massive debris flow deposits containing blocks of organic material. However, the polycyclic nature of slumps and how one episode may impact another are not fully understood. The objectives of this project are to: 1) Visualize 3D landscape evolution changes related to polycyclic thermokarst for multiple slumps on Herschel Island from 2004 to 2013; and 2) Investigate and compare the polycyclic thermokarst behaviour between the slumps using a combination of cryostratigraphic, ground-penetrating radar, electrical resistivity, and biogeographic datasets of vegetation succession following disturbance (Cray and Pollard, 2015). The landscape evolution models are generated by comparing the annual headwall positions of the slumps (2004-2013) ... |
format |
Conference Object |
author |
Angelopoulos, Michael Pollard, Wayne Krautblatter, Michael Lantuit, Hugues |
spellingShingle |
Angelopoulos, Michael Pollard, Wayne Krautblatter, Michael Lantuit, Hugues Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory |
author_facet |
Angelopoulos, Michael Pollard, Wayne Krautblatter, Michael Lantuit, Hugues |
author_sort |
Angelopoulos, Michael |
title |
Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory |
title_short |
Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory |
title_full |
Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory |
title_fullStr |
Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory |
title_full_unstemmed |
Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory |
title_sort |
landscape evolution triggered by polycyclic thermokarst on herschel island, yukon territory |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/41118/ https://hdl.handle.net/10013/epic.48704 |
long_lat |
ENVELOPE(-139.089,-139.089,69.583,69.583) ENVELOPE(-58.133,-58.133,-62.150,-62.150) ENVELOPE(64.617,64.617,-70.467,-70.467) |
geographic |
Arctic Herschel Island Low Head Pollard Yukon |
geographic_facet |
Arctic Herschel Island Low Head Pollard Yukon |
genre |
Arctic Herschel Herschel Island Ice permafrost Thermokarst wedge* Yukon |
genre_facet |
Arctic Herschel Herschel Island Ice permafrost Thermokarst wedge* Yukon |
op_source |
EPIC3ICOP 2016, Potsdam, Germany, 2016-06-20-2016-06-24 |
op_relation |
Angelopoulos, M. , Pollard, W. , Krautblatter, M. and Lantuit, H. orcid:0000-0003-1497-6760 (2016) Landscape Evolution Triggered by Polycyclic Thermokarst on Herschel Island, Yukon Territory , ICOP 2016, Potsdam, Germany, 20 June 2016 - 24 June 2016 . hdl:10013/epic.48704 |
_version_ |
1766345492177879040 |