Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations
From temperature measurements down through the 3001 m deep borehole at the North Greenland Icecore Project (NorthGRIP) drill site, it is now clear that the ice at the base, 3080 m below the surface, is at the pressure-melting point. This is supported by the measurements on the ice core where the ann...
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ftawi:oai:epic.awi.de:45965 2024-09-15T17:39:58+00:00 Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations Gundestrup, N. Dahl-Jensen, D. Gogineni, P Miller, Heinrich 2003 https://epic.awi.de/id/eprint/45965/ unknown INT GLACIOL SOC Gundestrup, N. , Dahl-Jensen, D. , Gogineni, P. and Miller, H. (2003) Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations , Annals of Glaciology, 37 , pp. 207-212 . doi:10.3189/172756403781815492 <https://doi.org/10.3189/172756403781815492> EPIC3Annals of Glaciology, INT GLACIOL SOC, 37, pp. 207-212, ISSN: 0260-3055 Article isiRev 2003 ftawi https://doi.org/10.3189/172756403781815492 2024-06-24T04:18:50Z From temperature measurements down through the 3001 m deep borehole at the North Greenland Icecore Project (NorthGRIP) drill site, it is now clear that the ice at the base, 3080 m below the surface, is at the pressure-melting point. This is supported by the measurements on the ice core where the annual-layer thicknesses show there is bottom melting at the site and upstream from the borehole. Surface velocity measurements, internal radio-echo layers, borehole and ice-core data are used to constrain a time-dependent flow model simulating flow along the north-northwest-trending ice-ridge flow-line, leading to the NorthGRIP site. Also time-dependent melt rates along the flowline are calculated with a heat-flow model. The results show the geothermal heat flow varies from 50 to 200 mW m–2 along the 100km section of the modeled flowline. The melt rate at the NorthGRIP site is 0.75 cm a–1, but the deep ice in the NorthGRIP core originated 50 km upstream and has experienced melt rates as high as 1.1 cm a–1. Article in Journal/Newspaper Annals of Glaciology Greenland ice core North Greenland Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Annals of Glaciology 37 207 212 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
From temperature measurements down through the 3001 m deep borehole at the North Greenland Icecore Project (NorthGRIP) drill site, it is now clear that the ice at the base, 3080 m below the surface, is at the pressure-melting point. This is supported by the measurements on the ice core where the annual-layer thicknesses show there is bottom melting at the site and upstream from the borehole. Surface velocity measurements, internal radio-echo layers, borehole and ice-core data are used to constrain a time-dependent flow model simulating flow along the north-northwest-trending ice-ridge flow-line, leading to the NorthGRIP site. Also time-dependent melt rates along the flowline are calculated with a heat-flow model. The results show the geothermal heat flow varies from 50 to 200 mW m–2 along the 100km section of the modeled flowline. The melt rate at the NorthGRIP site is 0.75 cm a–1, but the deep ice in the NorthGRIP core originated 50 km upstream and has experienced melt rates as high as 1.1 cm a–1. |
format |
Article in Journal/Newspaper |
author |
Gundestrup, N. Dahl-Jensen, D. Gogineni, P Miller, Heinrich |
spellingShingle |
Gundestrup, N. Dahl-Jensen, D. Gogineni, P Miller, Heinrich Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations |
author_facet |
Gundestrup, N. Dahl-Jensen, D. Gogineni, P Miller, Heinrich |
author_sort |
Gundestrup, N. |
title |
Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations |
title_short |
Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations |
title_full |
Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations |
title_fullStr |
Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations |
title_full_unstemmed |
Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations |
title_sort |
basal melt at northgrip modeled from borehole, ice-core and radio-echo sounder observations |
publisher |
INT GLACIOL SOC |
publishDate |
2003 |
url |
https://epic.awi.de/id/eprint/45965/ |
genre |
Annals of Glaciology Greenland ice core North Greenland |
genre_facet |
Annals of Glaciology Greenland ice core North Greenland |
op_source |
EPIC3Annals of Glaciology, INT GLACIOL SOC, 37, pp. 207-212, ISSN: 0260-3055 |
op_relation |
Gundestrup, N. , Dahl-Jensen, D. , Gogineni, P. and Miller, H. (2003) Basal melt at NorthGRIP modeled from borehole, ice-core and radio-echo sounder observations , Annals of Glaciology, 37 , pp. 207-212 . doi:10.3189/172756403781815492 <https://doi.org/10.3189/172756403781815492> |
op_doi |
https://doi.org/10.3189/172756403781815492 |
container_title |
Annals of Glaciology |
container_volume |
37 |
container_start_page |
207 |
op_container_end_page |
212 |
_version_ |
1810483691244224512 |