Global Positioning System (GPS) positions and in situ ice deformation from borehole inclinometry measurements in Western Greenland, winter 2015-16
Combined measurements of Global Positioning System (GPS) surface positions and in situ measurements of ice deformation advance understanding of ice dynamics on the Greenland ice sheet by allowing the for the partitioning of surface motion into its basal and deformation components. We analyzed winter...
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2019
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dataone:doi:10.18739/A2154DP90 2024-06-03T18:46:51+00:00 Global Positioning System (GPS) positions and in situ ice deformation from borehole inclinometry measurements in Western Greenland, winter 2015-16 Nathan Maier Western Greenland Ice Sheet's (GrIS) ablation zone ~33 km east of the terrestrial terminus of Isunnguata Sermia. Ice thickness at the study site ranges from 641 to 675 m. Radar data indicate that the bed is relatively flat with a slight reverse bed slope, although an east/west trending, 1000 m deep basal trough exists ~1.8 km north of the site, and ~2.5 km downgradient. ENVELOPE(-49.569607,-49.569607,67.182045,67.182045) BEGINDATE: 2015-09-12T00:00:00Z ENDDATE: 2016-05-09T00:00:00Z 2019-01-01T00:00:00Z https://doi.org/10.18739/A2154DP90 unknown Arctic Data Center ice deformation ice motion Dataset 2019 dataone:urn:node:ARCTIC https://doi.org/10.18739/A2154DP90 2024-06-03T18:16:34Z Combined measurements of Global Positioning System (GPS) surface positions and in situ measurements of ice deformation advance understanding of ice dynamics on the Greenland ice sheet by allowing the for the partitioning of surface motion into its basal and deformation components. We analyzed winter motion by partitioning the surface into sliding and deformation. Here, we present GPS positions from a five station GPS array and of ice tilt in two orthogonal directions and azimuth through a vertical column extending from the ice surface to the bed at eight boreholes drilled at location western Greenland and collected over the 2015-16 winter. We find that sliding dominates ice motion, comprising 96% of the total surface motion during the winter. Interestingly, we find time variations in the tilt rates of the near basal inclinometers, which are attributable to the effects of basal roughness on the local stress field as the ice slides across the basal boundary. Dataset Greenland Ice Sheet Arctic Data Center (via DataONE) Greenland Isunnguata Sermia ENVELOPE(-50.167,-50.167,67.183,67.183) ENVELOPE(-49.569607,-49.569607,67.182045,67.182045) |
institution |
Open Polar |
collection |
Arctic Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:ARCTIC |
language |
unknown |
topic |
ice deformation ice motion |
spellingShingle |
ice deformation ice motion Nathan Maier Global Positioning System (GPS) positions and in situ ice deformation from borehole inclinometry measurements in Western Greenland, winter 2015-16 |
topic_facet |
ice deformation ice motion |
description |
Combined measurements of Global Positioning System (GPS) surface positions and in situ measurements of ice deformation advance understanding of ice dynamics on the Greenland ice sheet by allowing the for the partitioning of surface motion into its basal and deformation components. We analyzed winter motion by partitioning the surface into sliding and deformation. Here, we present GPS positions from a five station GPS array and of ice tilt in two orthogonal directions and azimuth through a vertical column extending from the ice surface to the bed at eight boreholes drilled at location western Greenland and collected over the 2015-16 winter. We find that sliding dominates ice motion, comprising 96% of the total surface motion during the winter. Interestingly, we find time variations in the tilt rates of the near basal inclinometers, which are attributable to the effects of basal roughness on the local stress field as the ice slides across the basal boundary. |
format |
Dataset |
author |
Nathan Maier |
author_facet |
Nathan Maier |
author_sort |
Nathan Maier |
title |
Global Positioning System (GPS) positions and in situ ice deformation from borehole inclinometry measurements in Western Greenland, winter 2015-16 |
title_short |
Global Positioning System (GPS) positions and in situ ice deformation from borehole inclinometry measurements in Western Greenland, winter 2015-16 |
title_full |
Global Positioning System (GPS) positions and in situ ice deformation from borehole inclinometry measurements in Western Greenland, winter 2015-16 |
title_fullStr |
Global Positioning System (GPS) positions and in situ ice deformation from borehole inclinometry measurements in Western Greenland, winter 2015-16 |
title_full_unstemmed |
Global Positioning System (GPS) positions and in situ ice deformation from borehole inclinometry measurements in Western Greenland, winter 2015-16 |
title_sort |
global positioning system (gps) positions and in situ ice deformation from borehole inclinometry measurements in western greenland, winter 2015-16 |
publisher |
Arctic Data Center |
publishDate |
2019 |
url |
https://doi.org/10.18739/A2154DP90 |
op_coverage |
Western Greenland Ice Sheet's (GrIS) ablation zone ~33 km east of the terrestrial terminus of Isunnguata Sermia. Ice thickness at the study site ranges from 641 to 675 m. Radar data indicate that the bed is relatively flat with a slight reverse bed slope, although an east/west trending, 1000 m deep basal trough exists ~1.8 km north of the site, and ~2.5 km downgradient. ENVELOPE(-49.569607,-49.569607,67.182045,67.182045) BEGINDATE: 2015-09-12T00:00:00Z ENDDATE: 2016-05-09T00:00:00Z |
long_lat |
ENVELOPE(-50.167,-50.167,67.183,67.183) ENVELOPE(-49.569607,-49.569607,67.182045,67.182045) |
geographic |
Greenland Isunnguata Sermia |
geographic_facet |
Greenland Isunnguata Sermia |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_doi |
https://doi.org/10.18739/A2154DP90 |
_version_ |
1800872215056482304 |