DataSheet1.pdf
Given high-resolution satellite-derived surface elevation and velocity data, ice-sheet models generally estimate mechanical basal boundary conditions using surface-to-bed inversion methods. In this work, we address the sensitivity of results from inversion methods to the accuracy of the bed elevatio...
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | unknown |
Published: |
2018
|
Subjects: | |
Online Access: | https://doi.org/10.3389/feart.2018.00033.s001 https://figshare.com/articles/DataSheet1_pdf/6127016 |
id |
ftfrontimediafig:oai:figshare.com:article/6127016 |
---|---|
record_format |
openpolar |
spelling |
ftfrontimediafig:oai:figshare.com:article/6127016 2023-05-15T13:50:10+02:00 DataSheet1.pdf Teresa M. Kyrke-Smith G. Hilmar Gudmundsson Patrick E. Farrell 2018-04-11T10:11:20Z https://doi.org/10.3389/feart.2018.00033.s001 https://figshare.com/articles/DataSheet1_pdf/6127016 unknown doi:10.3389/feart.2018.00033.s001 https://figshare.com/articles/DataSheet1_pdf/6127016 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change ice-sheets inversion methods sliding laws Antarctica subglacial conditions Dataset 2018 ftfrontimediafig https://doi.org/10.3389/feart.2018.00033.s001 2018-04-11T22:56:31Z Given high-resolution satellite-derived surface elevation and velocity data, ice-sheet models generally estimate mechanical basal boundary conditions using surface-to-bed inversion methods. In this work, we address the sensitivity of results from inversion methods to the accuracy of the bed elevation data on Pine Island Glacier. We show that misfit between observations and model output is reduced when high-resolution bed topography is used in the inverse model. By looking at results with a range of detail included in the bed elevation, we consider the separation of basal drag due to the bed topography (form drag) and that due to inherent bed properties (skin drag). The mean value of inverted basal shear stress, i.e., skin drag, is reduced when more detailed topography is included in the model. This suggests that without a fully resolved bed a significant amount of the basal shear stress recovered from inversion methods may be due to the unresolved bed topography. However, the spatial structure of the retrieved fields is robust as the bed accuracy is varied; the fields are instead sensitive to the degree of regularization applied to the inversion. While the implications for the future temporal evolution of PIG are not quantified here directly, our work raises the possibility that skin drag may be overestimated in the current generation of numerical ice-sheet models of this area. These shortcomings could be overcome by inverting simultaneously for both bed topography and basal slipperiness. Dataset Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier Frontiers: Figshare Pine Island Glacier ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
institution |
Open Polar |
collection |
Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change ice-sheets inversion methods sliding laws Antarctica subglacial conditions |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change ice-sheets inversion methods sliding laws Antarctica subglacial conditions Teresa M. Kyrke-Smith G. Hilmar Gudmundsson Patrick E. Farrell DataSheet1.pdf |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change ice-sheets inversion methods sliding laws Antarctica subglacial conditions |
description |
Given high-resolution satellite-derived surface elevation and velocity data, ice-sheet models generally estimate mechanical basal boundary conditions using surface-to-bed inversion methods. In this work, we address the sensitivity of results from inversion methods to the accuracy of the bed elevation data on Pine Island Glacier. We show that misfit between observations and model output is reduced when high-resolution bed topography is used in the inverse model. By looking at results with a range of detail included in the bed elevation, we consider the separation of basal drag due to the bed topography (form drag) and that due to inherent bed properties (skin drag). The mean value of inverted basal shear stress, i.e., skin drag, is reduced when more detailed topography is included in the model. This suggests that without a fully resolved bed a significant amount of the basal shear stress recovered from inversion methods may be due to the unresolved bed topography. However, the spatial structure of the retrieved fields is robust as the bed accuracy is varied; the fields are instead sensitive to the degree of regularization applied to the inversion. While the implications for the future temporal evolution of PIG are not quantified here directly, our work raises the possibility that skin drag may be overestimated in the current generation of numerical ice-sheet models of this area. These shortcomings could be overcome by inverting simultaneously for both bed topography and basal slipperiness. |
format |
Dataset |
author |
Teresa M. Kyrke-Smith G. Hilmar Gudmundsson Patrick E. Farrell |
author_facet |
Teresa M. Kyrke-Smith G. Hilmar Gudmundsson Patrick E. Farrell |
author_sort |
Teresa M. Kyrke-Smith |
title |
DataSheet1.pdf |
title_short |
DataSheet1.pdf |
title_full |
DataSheet1.pdf |
title_fullStr |
DataSheet1.pdf |
title_full_unstemmed |
DataSheet1.pdf |
title_sort |
datasheet1.pdf |
publishDate |
2018 |
url |
https://doi.org/10.3389/feart.2018.00033.s001 https://figshare.com/articles/DataSheet1_pdf/6127016 |
long_lat |
ENVELOPE(-101.000,-101.000,-75.000,-75.000) |
geographic |
Pine Island Glacier |
geographic_facet |
Pine Island Glacier |
genre |
Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier |
genre_facet |
Antarc* Antarctica Ice Sheet Pine Island Pine Island Glacier |
op_relation |
doi:10.3389/feart.2018.00033.s001 https://figshare.com/articles/DataSheet1_pdf/6127016 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2018.00033.s001 |
_version_ |
1766253165572784128 |