Combining physics-based and statistics-based approaches to model calving in Antarctica
Surface and basal crevasses are deep fractures in ice that are observed on the surface and the base of the Antarctic ice sheet/ice shelves, respectively. They are a direct pre- cursor of formation of rifts in ice shelves and a consequent calving or breaking off of icebergs. Modelling of calving is c...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/156513 2024-01-14T10:01:21+01:00 Combining physics-based and statistics-based approaches to model calving in Antarctica Emetc, Veronika http://hdl.handle.net/1885/156513 https://doi.org/10.25911/5c765954dc1a1 https://openresearch-repository.anu.edu.au/bitstream/1885/156513/4/Emetc%20Thesis%202019.pdf.jpg en_AU eng b5928528x http://hdl.handle.net/1885/156513 doi:10.25911/5c765954dc1a1 https://openresearch-repository.anu.edu.au/bitstream/1885/156513/4/Emetc%20Thesis%202019.pdf.jpg Antarctica ice shelves ice sheet calving fractures crevasses basal modelling ISSM Thesis (PhD) ftanucanberra https://doi.org/10.25911/5c765954dc1a1 2023-12-15T09:36:41Z Surface and basal crevasses are deep fractures in ice that are observed on the surface and the base of the Antarctic ice sheet/ice shelves, respectively. They are a direct pre- cursor of formation of rifts in ice shelves and a consequent calving or breaking off of icebergs. Modelling of calving is crucial for better estimation of the ice mass balance in Antarctica because ice shelves act like a supporting mechanism for the inland ice preventing it from accelerating into the ocean. While there have been a number of studies that attempted to parameterise calving, each of them has limitations that do not allow to apply them to all the Antarctic ice shelves on a large scale. A more comprehensive calving model needs to include not only parameterisation of calving at ice fronts, but also the history of fracturing of the ice that led to a calving event such as formation, advection and propagation of both surface and basal crevasses. Towards improving a calving parameterisation in ice sheet models we constructed a set of sub-models for predicting surface and basal fracturing, vertical and horizontal propagation as well as advection. Combining statistics-based and physics-based ap- proachers we developed a preliminary calving model that includes the full history of rifts and crevasses, from their initiation to the final break off at the ice front. Doctoral or Postdoctoral Thesis Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Iceberg* Australian National University: ANU Digital Collections Antarctic The Antarctic |
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Open Polar |
collection |
Australian National University: ANU Digital Collections |
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ftanucanberra |
language |
English |
topic |
Antarctica ice shelves ice sheet calving fractures crevasses basal modelling ISSM |
spellingShingle |
Antarctica ice shelves ice sheet calving fractures crevasses basal modelling ISSM Emetc, Veronika Combining physics-based and statistics-based approaches to model calving in Antarctica |
topic_facet |
Antarctica ice shelves ice sheet calving fractures crevasses basal modelling ISSM |
description |
Surface and basal crevasses are deep fractures in ice that are observed on the surface and the base of the Antarctic ice sheet/ice shelves, respectively. They are a direct pre- cursor of formation of rifts in ice shelves and a consequent calving or breaking off of icebergs. Modelling of calving is crucial for better estimation of the ice mass balance in Antarctica because ice shelves act like a supporting mechanism for the inland ice preventing it from accelerating into the ocean. While there have been a number of studies that attempted to parameterise calving, each of them has limitations that do not allow to apply them to all the Antarctic ice shelves on a large scale. A more comprehensive calving model needs to include not only parameterisation of calving at ice fronts, but also the history of fracturing of the ice that led to a calving event such as formation, advection and propagation of both surface and basal crevasses. Towards improving a calving parameterisation in ice sheet models we constructed a set of sub-models for predicting surface and basal fracturing, vertical and horizontal propagation as well as advection. Combining statistics-based and physics-based ap- proachers we developed a preliminary calving model that includes the full history of rifts and crevasses, from their initiation to the final break off at the ice front. |
format |
Doctoral or Postdoctoral Thesis |
author |
Emetc, Veronika |
author_facet |
Emetc, Veronika |
author_sort |
Emetc, Veronika |
title |
Combining physics-based and statistics-based approaches to model calving in Antarctica |
title_short |
Combining physics-based and statistics-based approaches to model calving in Antarctica |
title_full |
Combining physics-based and statistics-based approaches to model calving in Antarctica |
title_fullStr |
Combining physics-based and statistics-based approaches to model calving in Antarctica |
title_full_unstemmed |
Combining physics-based and statistics-based approaches to model calving in Antarctica |
title_sort |
combining physics-based and statistics-based approaches to model calving in antarctica |
url |
http://hdl.handle.net/1885/156513 https://doi.org/10.25911/5c765954dc1a1 https://openresearch-repository.anu.edu.au/bitstream/1885/156513/4/Emetc%20Thesis%202019.pdf.jpg |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Iceberg* |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Iceberg* |
op_relation |
b5928528x http://hdl.handle.net/1885/156513 doi:10.25911/5c765954dc1a1 https://openresearch-repository.anu.edu.au/bitstream/1885/156513/4/Emetc%20Thesis%202019.pdf.jpg |
op_doi |
https://doi.org/10.25911/5c765954dc1a1 |
_version_ |
1788067139286990848 |