The effects of rotation and ice shelf topography on frazil-laden ice shelf water plumes
A model of the dynamics and thermodynamics of a plume of meltwater at the base of an ice shelf is presented. Such ice shelf water plumes may become supercooled and deposit marine ice if they rise (because of the pressure decrease in the in situ freezing temperature), so the model incorporates both m...
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AMER METEOROLOGICAL SOC
2006
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ftucl:oai:eprints.ucl.ac.uk.OAI2:54563 2023-05-15T13:50:20+02:00 The effects of rotation and ice shelf topography on frazil-laden ice shelf water plumes Holland, PR Feltham, DL 2006-12 http://discovery.ucl.ac.uk/54563/ unknown AMER METEOROLOGICAL SOC J PHYS OCEANOGR , 36 (12) 2312 - 2327. (2006) THERMOHALINE CIRCULATION CONTINENTAL-SLOPE OCEAN INTERACTION NUMERICAL-MODEL BOTTOM WATER WEDDELL SEA RONNE ANTARCTICA DYNAMICS LAYER Article 2006 ftucl 2016-01-15T01:25:04Z A model of the dynamics and thermodynamics of a plume of meltwater at the base of an ice shelf is presented. Such ice shelf water plumes may become supercooled and deposit marine ice if they rise (because of the pressure decrease in the in situ freezing temperature), so the model incorporates both melting and freezing at the ice shelf base and a multiple-size-class model of frazil ice dynamics and deposition. The plume is considered in two horizontal dimensions, so the influence of Coriolis forces is incorporated for the first time. It is found that rotation is extremely influential, with simulated plumes flowing in near-geostrophy because of the low friction at a smooth ice shelf base. As a result, an ice shelf water plume will only rise and become supercooled (and thus deposit marine ice) if it is constrained to flow upslope by topography. This result agrees with the observed distribution of marine ice under Filchner-Ronne Ice Shelf, Antarctica. In addition, it is found that the model only produces reasonable marine ice formation rates when an accurate ice shelf draft is used, implying that the characteristics of real ice shelf water plumes can only be captured using models with both rotation and a realistic topography. Article in Journal/Newspaper Antarc* Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Weddell Sea University College London: UCL Discovery Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Weddell Weddell Sea |
institution |
Open Polar |
collection |
University College London: UCL Discovery |
op_collection_id |
ftucl |
language |
unknown |
topic |
THERMOHALINE CIRCULATION CONTINENTAL-SLOPE OCEAN INTERACTION NUMERICAL-MODEL BOTTOM WATER WEDDELL SEA RONNE ANTARCTICA DYNAMICS LAYER |
spellingShingle |
THERMOHALINE CIRCULATION CONTINENTAL-SLOPE OCEAN INTERACTION NUMERICAL-MODEL BOTTOM WATER WEDDELL SEA RONNE ANTARCTICA DYNAMICS LAYER Holland, PR Feltham, DL The effects of rotation and ice shelf topography on frazil-laden ice shelf water plumes |
topic_facet |
THERMOHALINE CIRCULATION CONTINENTAL-SLOPE OCEAN INTERACTION NUMERICAL-MODEL BOTTOM WATER WEDDELL SEA RONNE ANTARCTICA DYNAMICS LAYER |
description |
A model of the dynamics and thermodynamics of a plume of meltwater at the base of an ice shelf is presented. Such ice shelf water plumes may become supercooled and deposit marine ice if they rise (because of the pressure decrease in the in situ freezing temperature), so the model incorporates both melting and freezing at the ice shelf base and a multiple-size-class model of frazil ice dynamics and deposition. The plume is considered in two horizontal dimensions, so the influence of Coriolis forces is incorporated for the first time. It is found that rotation is extremely influential, with simulated plumes flowing in near-geostrophy because of the low friction at a smooth ice shelf base. As a result, an ice shelf water plume will only rise and become supercooled (and thus deposit marine ice) if it is constrained to flow upslope by topography. This result agrees with the observed distribution of marine ice under Filchner-Ronne Ice Shelf, Antarctica. In addition, it is found that the model only produces reasonable marine ice formation rates when an accurate ice shelf draft is used, implying that the characteristics of real ice shelf water plumes can only be captured using models with both rotation and a realistic topography. |
format |
Article in Journal/Newspaper |
author |
Holland, PR Feltham, DL |
author_facet |
Holland, PR Feltham, DL |
author_sort |
Holland, PR |
title |
The effects of rotation and ice shelf topography on frazil-laden ice shelf water plumes |
title_short |
The effects of rotation and ice shelf topography on frazil-laden ice shelf water plumes |
title_full |
The effects of rotation and ice shelf topography on frazil-laden ice shelf water plumes |
title_fullStr |
The effects of rotation and ice shelf topography on frazil-laden ice shelf water plumes |
title_full_unstemmed |
The effects of rotation and ice shelf topography on frazil-laden ice shelf water plumes |
title_sort |
effects of rotation and ice shelf topography on frazil-laden ice shelf water plumes |
publisher |
AMER METEOROLOGICAL SOC |
publishDate |
2006 |
url |
http://discovery.ucl.ac.uk/54563/ |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Ronne Ice Shelf Weddell Weddell Sea |
geographic_facet |
Ronne Ice Shelf Weddell Weddell Sea |
genre |
Antarc* Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctica Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Weddell Sea |
op_source |
J PHYS OCEANOGR , 36 (12) 2312 - 2327. (2006) |
_version_ |
1766253372018524160 |