Numerical simulation of the Filchner overflow
The plume of Ice Shelf Water (ISW) flowing into the Weddell Sea over the Filchner sill contributes to the formation of Antarctic Bottom Water. The Filchner overflow is simulated using a hydrostatic, primitive equation three-dimensional ocean model with a 0.5-2 Sv ISW influx above the Filchner sill....
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American Geophysical Union
2009
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Online Access: | http://nora.nerc.ac.uk/id/eprint/11378/ https://nora.nerc.ac.uk/id/eprint/11378/1/2008JC005013.pdf |
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ftnerc:oai:nora.nerc.ac.uk:11378 2023-05-15T13:45:10+02:00 Numerical simulation of the Filchner overflow Wilchinsky, Alexander V. Feltham, Daniel L. 2009 text http://nora.nerc.ac.uk/id/eprint/11378/ https://nora.nerc.ac.uk/id/eprint/11378/1/2008JC005013.pdf en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/11378/1/2008JC005013.pdf Wilchinsky, Alexander V.; Feltham, Daniel L. 2009 Numerical simulation of the Filchner overflow. Journal of Geophysical Research, 114 (C12), C12012. 20, pp. https://doi.org/10.1029/2008JC005013 <https://doi.org/10.1029/2008JC005013> Marine Sciences Hydrology Publication - Article PeerReviewed 2009 ftnerc https://doi.org/10.1029/2008JC005013 2023-02-04T19:27:17Z The plume of Ice Shelf Water (ISW) flowing into the Weddell Sea over the Filchner sill contributes to the formation of Antarctic Bottom Water. The Filchner overflow is simulated using a hydrostatic, primitive equation three-dimensional ocean model with a 0.5-2 Sv ISW influx above the Filchner sill. The best fit to mooring temperature observations is found with influxes of 0.5 and 1 Sv, below a previous estimate of 1.6 +/- 0.5 Sv based on sparse mooring velocities. The plume first moves north over the continental shelf, and then turns west, along slope of the continental shelf break where it breaks up into subplumes and domes, some of which then move downslope. Other subplumes run into the eastern submarine ridge and propagate along the ridge downslope in a chaotic manner. The next, western ridge is crossed by the plume through several paths. Despite a number of discrepancies with observational data, the model reproduces many attributes of the flow. In particular, we argue that the temporal variability shown by the observations can largely be attributed to the unstable structure of the flow, where the temperature fluctuations are determined by the motion of the domes past the moorings. Our sensitivity studies show that while thermobaricity plays a role, its effect is small for the flows considered. Smoothing the ridges out demonstrate that their presence strongly affects the plume shape around the ridges. An increase in the bottom drag or viscosity leads to slowing down, and hence thickening and widening of the plume. Article in Journal/Newspaper Antarc* Antarctic Ice Shelf Weddell Sea Natural Environment Research Council: NERC Open Research Archive Antarctic Weddell Weddell Sea Journal of Geophysical Research 114 C12 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
topic |
Marine Sciences Hydrology |
spellingShingle |
Marine Sciences Hydrology Wilchinsky, Alexander V. Feltham, Daniel L. Numerical simulation of the Filchner overflow |
topic_facet |
Marine Sciences Hydrology |
description |
The plume of Ice Shelf Water (ISW) flowing into the Weddell Sea over the Filchner sill contributes to the formation of Antarctic Bottom Water. The Filchner overflow is simulated using a hydrostatic, primitive equation three-dimensional ocean model with a 0.5-2 Sv ISW influx above the Filchner sill. The best fit to mooring temperature observations is found with influxes of 0.5 and 1 Sv, below a previous estimate of 1.6 +/- 0.5 Sv based on sparse mooring velocities. The plume first moves north over the continental shelf, and then turns west, along slope of the continental shelf break where it breaks up into subplumes and domes, some of which then move downslope. Other subplumes run into the eastern submarine ridge and propagate along the ridge downslope in a chaotic manner. The next, western ridge is crossed by the plume through several paths. Despite a number of discrepancies with observational data, the model reproduces many attributes of the flow. In particular, we argue that the temporal variability shown by the observations can largely be attributed to the unstable structure of the flow, where the temperature fluctuations are determined by the motion of the domes past the moorings. Our sensitivity studies show that while thermobaricity plays a role, its effect is small for the flows considered. Smoothing the ridges out demonstrate that their presence strongly affects the plume shape around the ridges. An increase in the bottom drag or viscosity leads to slowing down, and hence thickening and widening of the plume. |
format |
Article in Journal/Newspaper |
author |
Wilchinsky, Alexander V. Feltham, Daniel L. |
author_facet |
Wilchinsky, Alexander V. Feltham, Daniel L. |
author_sort |
Wilchinsky, Alexander V. |
title |
Numerical simulation of the Filchner overflow |
title_short |
Numerical simulation of the Filchner overflow |
title_full |
Numerical simulation of the Filchner overflow |
title_fullStr |
Numerical simulation of the Filchner overflow |
title_full_unstemmed |
Numerical simulation of the Filchner overflow |
title_sort |
numerical simulation of the filchner overflow |
publisher |
American Geophysical Union |
publishDate |
2009 |
url |
http://nora.nerc.ac.uk/id/eprint/11378/ https://nora.nerc.ac.uk/id/eprint/11378/1/2008JC005013.pdf |
geographic |
Antarctic Weddell Weddell Sea |
geographic_facet |
Antarctic Weddell Weddell Sea |
genre |
Antarc* Antarctic Ice Shelf Weddell Sea |
genre_facet |
Antarc* Antarctic Ice Shelf Weddell Sea |
op_relation |
https://nora.nerc.ac.uk/id/eprint/11378/1/2008JC005013.pdf Wilchinsky, Alexander V.; Feltham, Daniel L. 2009 Numerical simulation of the Filchner overflow. Journal of Geophysical Research, 114 (C12), C12012. 20, pp. https://doi.org/10.1029/2008JC005013 <https://doi.org/10.1029/2008JC005013> |
op_doi |
https://doi.org/10.1029/2008JC005013 |
container_title |
Journal of Geophysical Research |
container_volume |
114 |
container_issue |
C12 |
_version_ |
1766214523026407424 |