Numerical modelling of landfast sea ice
Landfast sea ice is a recurring seasonal feature along many coastlines in the polar regions. It is characterised by a lack of horizontal motion, for at least 20 days, and its attachment to the coast or seabed. It can form as a result of restrictive geometry, such as channels or embayments, or throug...
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ftunivliverpool:oai:livrepository.liverpool.ac.uk:18773 2023-05-15T15:14:34+02:00 Numerical modelling of landfast sea ice Carson, Nuala Morales Maqueda, Miguel Ángel Leach, Harry Postlethwaite, Clare 2014-06-01 application/pdf http://livrepository.liverpool.ac.uk/18773/ http://livrepository.liverpool.ac.uk/18773/1/CarsonNuala_June2014_18773.pdf en eng http://livrepository.liverpool.ac.uk/18773/1/CarsonNuala_June2014_18773.pdf Carson, Nuala (2014) Numerical modelling of landfast sea ice. Doctor of Philosophy thesis, University of Liverpool. cc_by_nd CC-BY-ND Thesis NonPeerReviewed 2014 ftunivliverpool 2022-04-28T22:25:39Z Landfast sea ice is a recurring seasonal feature along many coastlines in the polar regions. It is characterised by a lack of horizontal motion, for at least 20 days, and its attachment to the coast or seabed. It can form as a result of restrictive geometry, such as channels or embayments, or through the grounding of thick ice ridges which add lateral stability to the ice cover. Due to its stationary and persistent nature, landfast ice fundamentally modifies the exchange of heat and momentum between the atmosphere and ocean, compared with more mobile pack ice. The current generation of sea ice models is not capable of reproducing certain aspects of landfast ice formation and breakup. In this work two landfast ice parameterisations were developed, which describe the formation and breakup of landfast ice through the grounding of thick ice ridges. The parameterisations assume the sub-grid scale distribution of ice draft and ocean depth, the two parameters important in determining the occurrence of grounded ridges. The sub-grid scale distribution of grounded ice is firstly defined by assuming that ice draft and ocean depth are independent. This parameterisation allowed ice of any thickness to occur and ground at any depth. Advancing from this the sub-grid scale distribution of the grounded ice was restricted in an effort to make it more realistic. Based on Arctic ice scour observations ice was prevented from grounding in regions where the draft thickness was much larger than the ocean depth. Both parameterisations were incorporated into a commonly used sea ice model, the Los Alamos Sea Ice Model (CICE), to which a multi-category ocean depth distribution from high resolution global bathymetry data (ETOPO1) was included. The parameterisations were tested in global standalone format (i.e. no active ocean) with realistic atmospheric forcing. Both parameterisations were found to improve the spatial distribution and the seasonal cycle of landfast ice compared to the control (i.e. no landfast ice parameterisation) in the ... Thesis Arctic Sea ice The University of Liverpool Repository Arctic |
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The University of Liverpool Repository |
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ftunivliverpool |
language |
English |
description |
Landfast sea ice is a recurring seasonal feature along many coastlines in the polar regions. It is characterised by a lack of horizontal motion, for at least 20 days, and its attachment to the coast or seabed. It can form as a result of restrictive geometry, such as channels or embayments, or through the grounding of thick ice ridges which add lateral stability to the ice cover. Due to its stationary and persistent nature, landfast ice fundamentally modifies the exchange of heat and momentum between the atmosphere and ocean, compared with more mobile pack ice. The current generation of sea ice models is not capable of reproducing certain aspects of landfast ice formation and breakup. In this work two landfast ice parameterisations were developed, which describe the formation and breakup of landfast ice through the grounding of thick ice ridges. The parameterisations assume the sub-grid scale distribution of ice draft and ocean depth, the two parameters important in determining the occurrence of grounded ridges. The sub-grid scale distribution of grounded ice is firstly defined by assuming that ice draft and ocean depth are independent. This parameterisation allowed ice of any thickness to occur and ground at any depth. Advancing from this the sub-grid scale distribution of the grounded ice was restricted in an effort to make it more realistic. Based on Arctic ice scour observations ice was prevented from grounding in regions where the draft thickness was much larger than the ocean depth. Both parameterisations were incorporated into a commonly used sea ice model, the Los Alamos Sea Ice Model (CICE), to which a multi-category ocean depth distribution from high resolution global bathymetry data (ETOPO1) was included. The parameterisations were tested in global standalone format (i.e. no active ocean) with realistic atmospheric forcing. Both parameterisations were found to improve the spatial distribution and the seasonal cycle of landfast ice compared to the control (i.e. no landfast ice parameterisation) in the ... |
author2 |
Morales Maqueda, Miguel Ángel Leach, Harry Postlethwaite, Clare |
format |
Thesis |
author |
Carson, Nuala |
spellingShingle |
Carson, Nuala Numerical modelling of landfast sea ice |
author_facet |
Carson, Nuala |
author_sort |
Carson, Nuala |
title |
Numerical modelling of landfast sea ice |
title_short |
Numerical modelling of landfast sea ice |
title_full |
Numerical modelling of landfast sea ice |
title_fullStr |
Numerical modelling of landfast sea ice |
title_full_unstemmed |
Numerical modelling of landfast sea ice |
title_sort |
numerical modelling of landfast sea ice |
publishDate |
2014 |
url |
http://livrepository.liverpool.ac.uk/18773/ http://livrepository.liverpool.ac.uk/18773/1/CarsonNuala_June2014_18773.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Sea ice |
genre_facet |
Arctic Sea ice |
op_relation |
http://livrepository.liverpool.ac.uk/18773/1/CarsonNuala_June2014_18773.pdf Carson, Nuala (2014) Numerical modelling of landfast sea ice. Doctor of Philosophy thesis, University of Liverpool. |
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CC-BY-ND |
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1766345014830432256 |