Constraining the geothermal heat flux in Greenland at regions of radar-detected basal water
The spatial distribution of basal water critically impacts the evolution of ice sheets. Current estimates of basal water distribution beneath the Greenland Ice Sheet (GrIS) contain large uncertainties due to poorly constrained boundary conditions, primarily from geothermal heat flux (GHF). The exist...
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Cambridge University Press
2019
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ftdoajarticles:oai:doaj.org/article:c80d20dbfc1248d18a121e21d9011bfd 2023-05-15T16:24:26+02:00 Constraining the geothermal heat flux in Greenland at regions of radar-detected basal water Soroush Rezvanbehbahani Leigh A. Stearns C. J. van der Veen Gordon K. A. Oswald Ralf Greve 2019-12-01T00:00:00Z https://doi.org/10.1017/jog.2019.79 https://doaj.org/article/c80d20dbfc1248d18a121e21d9011bfd EN eng Cambridge University Press https://www.cambridge.org/core/product/identifier/S0022143019000790/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.79 0022-1430 1727-5652 https://doaj.org/article/c80d20dbfc1248d18a121e21d9011bfd Journal of Glaciology, Vol 65, Pp 1023-1034 (2019) Basal ice ice-sheet modeling melt-basal radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 article 2019 ftdoajarticles https://doi.org/10.1017/jog.2019.79 2023-03-12T01:30:57Z The spatial distribution of basal water critically impacts the evolution of ice sheets. Current estimates of basal water distribution beneath the Greenland Ice Sheet (GrIS) contain large uncertainties due to poorly constrained boundary conditions, primarily from geothermal heat flux (GHF). The existing GHF models often contradict each other and implementing them in numerical ice-sheet models cannot reproduce the measured temperatures at ice core locations. Here we utilize two datasets of radar-detected basal water in Greenland to constrain the GHF at regions with a thawed bed. Using the three-dimensional ice-sheet model SICOPOLIS, we iteratively adjust the GHF to find the minimum GHF required to reach the bed to the pressure melting point, GHFpmp, at locations of radar-detected basal water. We identify parts of the central-east, south and northwest Greenland with significantly high GHFpmp. Conversely, we find that the majority of low-elevation regions of west Greenland and parts of northeast have very low GHFpmp. We compare the estimated constraints with the available GHF models for Greenland and show that GHF models often do not honor the estimated constraints. Our results highlight the need for community effort to reconcile the discrepancies between radar data, GHF models, and ice core information. Article in Journal/Newspaper Greenland ice core Ice Sheet Journal of Glaciology Directory of Open Access Journals: DOAJ Articles Greenland Journal of Glaciology 65 254 1023 1034 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Basal ice ice-sheet modeling melt-basal radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
spellingShingle |
Basal ice ice-sheet modeling melt-basal radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 Soroush Rezvanbehbahani Leigh A. Stearns C. J. van der Veen Gordon K. A. Oswald Ralf Greve Constraining the geothermal heat flux in Greenland at regions of radar-detected basal water |
topic_facet |
Basal ice ice-sheet modeling melt-basal radio-echo sounding Environmental sciences GE1-350 Meteorology. Climatology QC851-999 |
description |
The spatial distribution of basal water critically impacts the evolution of ice sheets. Current estimates of basal water distribution beneath the Greenland Ice Sheet (GrIS) contain large uncertainties due to poorly constrained boundary conditions, primarily from geothermal heat flux (GHF). The existing GHF models often contradict each other and implementing them in numerical ice-sheet models cannot reproduce the measured temperatures at ice core locations. Here we utilize two datasets of radar-detected basal water in Greenland to constrain the GHF at regions with a thawed bed. Using the three-dimensional ice-sheet model SICOPOLIS, we iteratively adjust the GHF to find the minimum GHF required to reach the bed to the pressure melting point, GHFpmp, at locations of radar-detected basal water. We identify parts of the central-east, south and northwest Greenland with significantly high GHFpmp. Conversely, we find that the majority of low-elevation regions of west Greenland and parts of northeast have very low GHFpmp. We compare the estimated constraints with the available GHF models for Greenland and show that GHF models often do not honor the estimated constraints. Our results highlight the need for community effort to reconcile the discrepancies between radar data, GHF models, and ice core information. |
format |
Article in Journal/Newspaper |
author |
Soroush Rezvanbehbahani Leigh A. Stearns C. J. van der Veen Gordon K. A. Oswald Ralf Greve |
author_facet |
Soroush Rezvanbehbahani Leigh A. Stearns C. J. van der Veen Gordon K. A. Oswald Ralf Greve |
author_sort |
Soroush Rezvanbehbahani |
title |
Constraining the geothermal heat flux in Greenland at regions of radar-detected basal water |
title_short |
Constraining the geothermal heat flux in Greenland at regions of radar-detected basal water |
title_full |
Constraining the geothermal heat flux in Greenland at regions of radar-detected basal water |
title_fullStr |
Constraining the geothermal heat flux in Greenland at regions of radar-detected basal water |
title_full_unstemmed |
Constraining the geothermal heat flux in Greenland at regions of radar-detected basal water |
title_sort |
constraining the geothermal heat flux in greenland at regions of radar-detected basal water |
publisher |
Cambridge University Press |
publishDate |
2019 |
url |
https://doi.org/10.1017/jog.2019.79 https://doaj.org/article/c80d20dbfc1248d18a121e21d9011bfd |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland ice core Ice Sheet Journal of Glaciology |
genre_facet |
Greenland ice core Ice Sheet Journal of Glaciology |
op_source |
Journal of Glaciology, Vol 65, Pp 1023-1034 (2019) |
op_relation |
https://www.cambridge.org/core/product/identifier/S0022143019000790/type/journal_article https://doaj.org/toc/0022-1430 https://doaj.org/toc/1727-5652 doi:10.1017/jog.2019.79 0022-1430 1727-5652 https://doaj.org/article/c80d20dbfc1248d18a121e21d9011bfd |
op_doi |
https://doi.org/10.1017/jog.2019.79 |
container_title |
Journal of Glaciology |
container_volume |
65 |
container_issue |
254 |
container_start_page |
1023 |
op_container_end_page |
1034 |
_version_ |
1766012892681863168 |