Geomorphological and geocryological maps of the Zackenberg Valley, NE Greenland (ArCGIS Map Package)
In High Arctic northern Greenland, future responses to climatic changes are poorly understood on a landscape scale. Here, we present a study of the geomorphology and cryostratigraphy in the Zackenberg Valley in NE Greenland (74°N) containing a geomorphological map and a simplified geocryological map...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.883484 2023-05-15T15:02:12+02:00 Geomorphological and geocryological maps of the Zackenberg Valley, NE Greenland (ArCGIS Map Package) Cable, Stefanie Christiansen, Hanne Hvidtfeldt Westergaard-Nielsen, Andreas Kroon, Aart Elberling, Bo LATITUDE: 74.473060 * LONGITUDE: -20.552500 2017-11-23 application/octet-stream, 1.4 MBytes https://doi.pangaea.de/10.1594/PANGAEA.883484 https://doi.org/10.1594/PANGAEA.883484 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.883484 https://doi.org/10.1594/PANGAEA.883484 CC-BY-NC-SA-3.0: Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY-NC-SA Supplement to: Cable, Stefanie; Christiansen, Hanne Hvidtfeldt; Westergaard-Nielsen, Andreas; Kroon, Aart; Elberling, Bo (2018): Geomorphological and cryostratigraphical analyses of the Zackenberg Valley, NE Greenland and significance of Holocene alluvial fans. Geomorphology, 303, 504-523, https://doi.org/10.1016/j.geomorph.2017.11.003 Changing Permafrost in the Arctic and its Global Effects in the 21st Century MULT Multiple investigations PAGE21 ZAC Zackenberg Northeast Greenland Dataset 2017 ftpangaea https://doi.org/10.1594/PANGAEA.883484 https://doi.org/10.1016/j.geomorph.2017.11.003 2023-01-20T09:10:00Z In High Arctic northern Greenland, future responses to climatic changes are poorly understood on a landscape scale. Here, we present a study of the geomorphology and cryostratigraphy in the Zackenberg Valley in NE Greenland (74°N) containing a geomorphological map and a simplified geocryological map, combined with analyses of 13 permafrost cores and two exposures. Cores from a solifluction sheet, alluvial fans, and an emerged delta were studied with regards to cryostructures, ice and total carbon contents, grain size distribution, and pore water electrical conductivity; and the samples were AMS 14C dated. The near-surface permafrost on slopes and alluvial fans is ice rich, as opposed to the ice-poor epigenetic permafrost in the emerged delta. Ground ice and carbon distribution are closely linked to sediment transport processes, which largely depend on lithology and topography. Holocene alluvial fans, covering 12% of the lowermost hillslopes, represent paleoenvironmental archives. During the contrasting climates of the Holocene, the alluvial fans continued to aggrade - through the warmer early Holocene Optimum, the colder late Holocene, and the following climate warming - and by 0.45 mm a- 1, on average. This is caused by three factors: sedimentation, ground ice aggradation, and vegetation growth and is reflected by AMS 14C dating and continuously alternating cryostructures. Highly variable sedimentation rates in space and time at the alluvial fans have been detected. This is also reflected by alternating lenticular and microlenticular cryostructures indicating syngenetic permafrost aggradation during sedimentation with suspended and organic-matrix cryostructures indicating quasi-syngenetic permafrost aggradation in response to vegetation growth in periods with reduced or no sedimentation. Over time, this causes organic matter to become buried, indicating that alluvial fans represent effective carbon sinks that have previously been overlooked. Dataset Arctic Greenland Ice permafrost Zackenberg PANGAEA - Data Publisher for Earth & Environmental Science Arctic Greenland ENVELOPE(-20.552500,-20.552500,74.473060,74.473060) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Changing Permafrost in the Arctic and its Global Effects in the 21st Century MULT Multiple investigations PAGE21 ZAC Zackenberg Northeast Greenland |
spellingShingle |
Changing Permafrost in the Arctic and its Global Effects in the 21st Century MULT Multiple investigations PAGE21 ZAC Zackenberg Northeast Greenland Cable, Stefanie Christiansen, Hanne Hvidtfeldt Westergaard-Nielsen, Andreas Kroon, Aart Elberling, Bo Geomorphological and geocryological maps of the Zackenberg Valley, NE Greenland (ArCGIS Map Package) |
topic_facet |
Changing Permafrost in the Arctic and its Global Effects in the 21st Century MULT Multiple investigations PAGE21 ZAC Zackenberg Northeast Greenland |
description |
In High Arctic northern Greenland, future responses to climatic changes are poorly understood on a landscape scale. Here, we present a study of the geomorphology and cryostratigraphy in the Zackenberg Valley in NE Greenland (74°N) containing a geomorphological map and a simplified geocryological map, combined with analyses of 13 permafrost cores and two exposures. Cores from a solifluction sheet, alluvial fans, and an emerged delta were studied with regards to cryostructures, ice and total carbon contents, grain size distribution, and pore water electrical conductivity; and the samples were AMS 14C dated. The near-surface permafrost on slopes and alluvial fans is ice rich, as opposed to the ice-poor epigenetic permafrost in the emerged delta. Ground ice and carbon distribution are closely linked to sediment transport processes, which largely depend on lithology and topography. Holocene alluvial fans, covering 12% of the lowermost hillslopes, represent paleoenvironmental archives. During the contrasting climates of the Holocene, the alluvial fans continued to aggrade - through the warmer early Holocene Optimum, the colder late Holocene, and the following climate warming - and by 0.45 mm a- 1, on average. This is caused by three factors: sedimentation, ground ice aggradation, and vegetation growth and is reflected by AMS 14C dating and continuously alternating cryostructures. Highly variable sedimentation rates in space and time at the alluvial fans have been detected. This is also reflected by alternating lenticular and microlenticular cryostructures indicating syngenetic permafrost aggradation during sedimentation with suspended and organic-matrix cryostructures indicating quasi-syngenetic permafrost aggradation in response to vegetation growth in periods with reduced or no sedimentation. Over time, this causes organic matter to become buried, indicating that alluvial fans represent effective carbon sinks that have previously been overlooked. |
format |
Dataset |
author |
Cable, Stefanie Christiansen, Hanne Hvidtfeldt Westergaard-Nielsen, Andreas Kroon, Aart Elberling, Bo |
author_facet |
Cable, Stefanie Christiansen, Hanne Hvidtfeldt Westergaard-Nielsen, Andreas Kroon, Aart Elberling, Bo |
author_sort |
Cable, Stefanie |
title |
Geomorphological and geocryological maps of the Zackenberg Valley, NE Greenland (ArCGIS Map Package) |
title_short |
Geomorphological and geocryological maps of the Zackenberg Valley, NE Greenland (ArCGIS Map Package) |
title_full |
Geomorphological and geocryological maps of the Zackenberg Valley, NE Greenland (ArCGIS Map Package) |
title_fullStr |
Geomorphological and geocryological maps of the Zackenberg Valley, NE Greenland (ArCGIS Map Package) |
title_full_unstemmed |
Geomorphological and geocryological maps of the Zackenberg Valley, NE Greenland (ArCGIS Map Package) |
title_sort |
geomorphological and geocryological maps of the zackenberg valley, ne greenland (arcgis map package) |
publisher |
PANGAEA |
publishDate |
2017 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.883484 https://doi.org/10.1594/PANGAEA.883484 |
op_coverage |
LATITUDE: 74.473060 * LONGITUDE: -20.552500 |
long_lat |
ENVELOPE(-20.552500,-20.552500,74.473060,74.473060) |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice permafrost Zackenberg |
genre_facet |
Arctic Greenland Ice permafrost Zackenberg |
op_source |
Supplement to: Cable, Stefanie; Christiansen, Hanne Hvidtfeldt; Westergaard-Nielsen, Andreas; Kroon, Aart; Elberling, Bo (2018): Geomorphological and cryostratigraphical analyses of the Zackenberg Valley, NE Greenland and significance of Holocene alluvial fans. Geomorphology, 303, 504-523, https://doi.org/10.1016/j.geomorph.2017.11.003 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.883484 https://doi.org/10.1594/PANGAEA.883484 |
op_rights |
CC-BY-NC-SA-3.0: Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY-NC-SA |
op_doi |
https://doi.org/10.1594/PANGAEA.883484 https://doi.org/10.1016/j.geomorph.2017.11.003 |
_version_ |
1766334183499628544 |