The effect of a new drag-law parameterization on ice shelf water plume dynamics
A drag law accounting for Ekman rotation adjacent to a flat, horizontal boundary is proposed for use in a plume model that is written in terms of the depth-mean velocity. The drag law contains a variable turning angle between the mean velocity and the drag imposed by the turbulent boundary layer. Th...
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AMER METEOROLOGICAL SOC
2007
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ftucl:oai:eprints.ucl.ac.uk.OAI2:154805 2023-05-15T13:42:34+02:00 The effect of a new drag-law parameterization on ice shelf water plume dynamics Wilchinsky, AV Feltham, DL Holland, PR 2007-07 http://discovery.ucl.ac.uk/154805/ unknown AMER METEOROLOGICAL SOC J PHYS OCEANOGR , 37 (7) 1778 - 1792. (2007) OVERFLOW OCEAN MODEL Article 2007 ftucl 2016-01-21T23:11:20Z A drag law accounting for Ekman rotation adjacent to a flat, horizontal boundary is proposed for use in a plume model that is written in terms of the depth-mean velocity. The drag law contains a variable turning angle between the mean velocity and the drag imposed by the turbulent boundary layer. The effect of the variable turning angle in the drag law is studied for a plume of ice shelf water ( ISW) ascending and turning beneath an Antarctic ice shelf with draft decreasing away from the grounding line. As the ISW plume ascends the sloping ice shelf-ocean boundary, it can melt the ice shelf, which alters the buoyancy forcing driving the plume motion. Under these conditions, the typical turning angle is of order -10 degrees over most of the plume area for a range of drag coefficients ( the minus sign arises for the Southern Hemisphere). The rotation of the drag with respect to the mean velocity is found to be significant if the drag coefficient exceeds 0.003; in this case the plume body propagates farther along and across the base of the ice shelf than a plume with the standard quadratic drag law with no turning angle. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf University College London: UCL Discovery Antarctic |
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Open Polar |
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University College London: UCL Discovery |
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topic |
OVERFLOW OCEAN MODEL |
spellingShingle |
OVERFLOW OCEAN MODEL Wilchinsky, AV Feltham, DL Holland, PR The effect of a new drag-law parameterization on ice shelf water plume dynamics |
topic_facet |
OVERFLOW OCEAN MODEL |
description |
A drag law accounting for Ekman rotation adjacent to a flat, horizontal boundary is proposed for use in a plume model that is written in terms of the depth-mean velocity. The drag law contains a variable turning angle between the mean velocity and the drag imposed by the turbulent boundary layer. The effect of the variable turning angle in the drag law is studied for a plume of ice shelf water ( ISW) ascending and turning beneath an Antarctic ice shelf with draft decreasing away from the grounding line. As the ISW plume ascends the sloping ice shelf-ocean boundary, it can melt the ice shelf, which alters the buoyancy forcing driving the plume motion. Under these conditions, the typical turning angle is of order -10 degrees over most of the plume area for a range of drag coefficients ( the minus sign arises for the Southern Hemisphere). The rotation of the drag with respect to the mean velocity is found to be significant if the drag coefficient exceeds 0.003; in this case the plume body propagates farther along and across the base of the ice shelf than a plume with the standard quadratic drag law with no turning angle. |
format |
Article in Journal/Newspaper |
author |
Wilchinsky, AV Feltham, DL Holland, PR |
author_facet |
Wilchinsky, AV Feltham, DL Holland, PR |
author_sort |
Wilchinsky, AV |
title |
The effect of a new drag-law parameterization on ice shelf water plume dynamics |
title_short |
The effect of a new drag-law parameterization on ice shelf water plume dynamics |
title_full |
The effect of a new drag-law parameterization on ice shelf water plume dynamics |
title_fullStr |
The effect of a new drag-law parameterization on ice shelf water plume dynamics |
title_full_unstemmed |
The effect of a new drag-law parameterization on ice shelf water plume dynamics |
title_sort |
effect of a new drag-law parameterization on ice shelf water plume dynamics |
publisher |
AMER METEOROLOGICAL SOC |
publishDate |
2007 |
url |
http://discovery.ucl.ac.uk/154805/ |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Ice Shelf |
genre_facet |
Antarc* Antarctic Ice Shelf |
op_source |
J PHYS OCEANOGR , 37 (7) 1778 - 1792. (2007) |
_version_ |
1766169795931144192 |