Granular flow in the marginal ice zone
The region of sea ice near the edge of the sea ice pack is known as the marginal ice zone (MIZ), and its dynamics are complicated by ocean wave interaction with the ice cover, strong gradients in the atmosphere and ocean and variations in sea ice rheology. This paper focuses on the role of sea ice r...
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ROYAL SOCIETY
2005
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ftucl:oai:eprints.ucl.ac.uk.OAI2:67137 2023-05-15T16:39:31+02:00 Granular flow in the marginal ice zone Feltham, DL 2005-07-15 http://discovery.ucl.ac.uk/67137/ unknown ROYAL SOCIETY PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES , 363 (1832) 1677 - 1700. (2005) sea ice marginal ice zone granular flow SEA-ICE MODEL COLLISIONS DYNAMICS Article 2005 ftucl 2016-01-15T01:49:26Z The region of sea ice near the edge of the sea ice pack is known as the marginal ice zone (MIZ), and its dynamics are complicated by ocean wave interaction with the ice cover, strong gradients in the atmosphere and ocean and variations in sea ice rheology. This paper focuses on the role of sea ice rheology in determining the dynamics of the MIZ. Here, sea ice is treated as a granular material with a composite rheology describing collisional ice floe interaction and plastic interaction. The collisional component of sea ice rheology depends upon the granular temperature, a measure of the kinetic energy of flow fluctuations. A simplified model of the MIZ is introduced consisting of the along and across momentum balance of the sea ice and the balance equation of fluctuation kinetic energy. The steady solution of these equations is found to leading order using elementary methods. This reveals a concentrated region of rapid ice flow parallel to the ice edge, which is in accordance with field observations, and previously called the ice jet. Previous explanations of the ice jet relied upon the existence of ocean currents beneath the ice cover. We show that an ice jet results as a natural consequence of the granular nature of sea ice. Article in Journal/Newspaper ice pack Sea ice University College London: UCL Discovery |
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University College London: UCL Discovery |
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sea ice marginal ice zone granular flow SEA-ICE MODEL COLLISIONS DYNAMICS |
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sea ice marginal ice zone granular flow SEA-ICE MODEL COLLISIONS DYNAMICS Feltham, DL Granular flow in the marginal ice zone |
topic_facet |
sea ice marginal ice zone granular flow SEA-ICE MODEL COLLISIONS DYNAMICS |
description |
The region of sea ice near the edge of the sea ice pack is known as the marginal ice zone (MIZ), and its dynamics are complicated by ocean wave interaction with the ice cover, strong gradients in the atmosphere and ocean and variations in sea ice rheology. This paper focuses on the role of sea ice rheology in determining the dynamics of the MIZ. Here, sea ice is treated as a granular material with a composite rheology describing collisional ice floe interaction and plastic interaction. The collisional component of sea ice rheology depends upon the granular temperature, a measure of the kinetic energy of flow fluctuations. A simplified model of the MIZ is introduced consisting of the along and across momentum balance of the sea ice and the balance equation of fluctuation kinetic energy. The steady solution of these equations is found to leading order using elementary methods. This reveals a concentrated region of rapid ice flow parallel to the ice edge, which is in accordance with field observations, and previously called the ice jet. Previous explanations of the ice jet relied upon the existence of ocean currents beneath the ice cover. We show that an ice jet results as a natural consequence of the granular nature of sea ice. |
format |
Article in Journal/Newspaper |
author |
Feltham, DL |
author_facet |
Feltham, DL |
author_sort |
Feltham, DL |
title |
Granular flow in the marginal ice zone |
title_short |
Granular flow in the marginal ice zone |
title_full |
Granular flow in the marginal ice zone |
title_fullStr |
Granular flow in the marginal ice zone |
title_full_unstemmed |
Granular flow in the marginal ice zone |
title_sort |
granular flow in the marginal ice zone |
publisher |
ROYAL SOCIETY |
publishDate |
2005 |
url |
http://discovery.ucl.ac.uk/67137/ |
genre |
ice pack Sea ice |
genre_facet |
ice pack Sea ice |
op_source |
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES , 363 (1832) 1677 - 1700. (2005) |
_version_ |
1766029857006813184 |