Modeling ocean processes below Fimbulisen, Antarctica
Model simulations of circulation and melting beneath Fimbulisen, Antarctica, obtained using an isopycnic coordinate ocean model, are presented. Model results compare well with available observations of currents and hydrography in the open ocean to the north of Fimbulisen and suggest that Warm Deep W...
Published in: | Journal of Geophysical Research |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union
2006
|
Subjects: | |
Online Access: | https://hdl.handle.net/1956/1061 https://doi.org/10.1029/2005jc002915 |
id |
ftunivbergen:oai:bora.uib.no:1956/1061 |
---|---|
record_format |
openpolar |
spelling |
ftunivbergen:oai:bora.uib.no:1956/1061 2023-05-15T13:36:55+02:00 Modeling ocean processes below Fimbulisen, Antarctica Smedsrud, Lars Henrik Jenkins, Adrian Holland, David M. Nøst, Ole A. 2006-01-18 756891 bytes application/pdf https://hdl.handle.net/1956/1061 https://doi.org/10.1029/2005jc002915 eng eng American Geophysical Union https://hdl.handle.net/1956/1061 https://doi.org/10.1029/2005jc002915 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Peer reviewed Journal article 2006 ftunivbergen https://doi.org/10.1029/2005jc002915 2023-03-14T17:39:42Z Model simulations of circulation and melting beneath Fimbulisen, Antarctica, obtained using an isopycnic coordinate ocean model, are presented. Model results compare well with available observations of currents and hydrography in the open ocean to the north of Fimbulisen and suggest that Warm Deep Water exists above the level of a sub-ice-shelf bedrock sill, the principal pathway for warm waters to enter the sub-iceshelf cavity. The model shows a southward inflow of Warm Deep Water over this sill and into the cavity, producing a mean cavity temperature close to -1.0ºC. This leads to high levels of basal melting (>10 m/a) at the grounding line of Jutulstraumen and an average melting over the ice shelf base close to 1.9 m/a. The southward inflow is a compensating flow caused by the northward outflow of fresh, cold water produced by the basal melting. Results on inflow and melting are difficult to validate since no in situ measurements yet exist in the cavity. If such high melt rates are realistic, the mass balance of Fimbulisen must be significantly negative, and the ice shelves along Dronning Maud Land must contribute about 4.4 mSv of melt water to the Weddell Sea, about 15% of the total Antarctic meltwater input to the Southern Ocean. Article in Journal/Newspaper Antarc* Antarctic Antarctica Dronning Maud Land Ice Shelf Ice Shelves Southern Ocean Weddell Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Antarctic Dronning Maud Land Fimbulisen ENVELOPE(-0.500,-0.500,-70.750,-70.750) Jutulstraumen ENVELOPE(-1.000,-1.000,-72.000,-72.000) Southern Ocean Weddell Weddell Sea Journal of Geophysical Research 111 C1 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
spellingShingle |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 Smedsrud, Lars Henrik Jenkins, Adrian Holland, David M. Nøst, Ole A. Modeling ocean processes below Fimbulisen, Antarctica |
topic_facet |
VDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Oseanografi: 452 VDP::Matematikk og Naturvitenskap: 400::Geofag: 450 |
description |
Model simulations of circulation and melting beneath Fimbulisen, Antarctica, obtained using an isopycnic coordinate ocean model, are presented. Model results compare well with available observations of currents and hydrography in the open ocean to the north of Fimbulisen and suggest that Warm Deep Water exists above the level of a sub-ice-shelf bedrock sill, the principal pathway for warm waters to enter the sub-iceshelf cavity. The model shows a southward inflow of Warm Deep Water over this sill and into the cavity, producing a mean cavity temperature close to -1.0ºC. This leads to high levels of basal melting (>10 m/a) at the grounding line of Jutulstraumen and an average melting over the ice shelf base close to 1.9 m/a. The southward inflow is a compensating flow caused by the northward outflow of fresh, cold water produced by the basal melting. Results on inflow and melting are difficult to validate since no in situ measurements yet exist in the cavity. If such high melt rates are realistic, the mass balance of Fimbulisen must be significantly negative, and the ice shelves along Dronning Maud Land must contribute about 4.4 mSv of melt water to the Weddell Sea, about 15% of the total Antarctic meltwater input to the Southern Ocean. |
format |
Article in Journal/Newspaper |
author |
Smedsrud, Lars Henrik Jenkins, Adrian Holland, David M. Nøst, Ole A. |
author_facet |
Smedsrud, Lars Henrik Jenkins, Adrian Holland, David M. Nøst, Ole A. |
author_sort |
Smedsrud, Lars Henrik |
title |
Modeling ocean processes below Fimbulisen, Antarctica |
title_short |
Modeling ocean processes below Fimbulisen, Antarctica |
title_full |
Modeling ocean processes below Fimbulisen, Antarctica |
title_fullStr |
Modeling ocean processes below Fimbulisen, Antarctica |
title_full_unstemmed |
Modeling ocean processes below Fimbulisen, Antarctica |
title_sort |
modeling ocean processes below fimbulisen, antarctica |
publisher |
American Geophysical Union |
publishDate |
2006 |
url |
https://hdl.handle.net/1956/1061 https://doi.org/10.1029/2005jc002915 |
long_lat |
ENVELOPE(-0.500,-0.500,-70.750,-70.750) ENVELOPE(-1.000,-1.000,-72.000,-72.000) |
geographic |
Antarctic Dronning Maud Land Fimbulisen Jutulstraumen Southern Ocean Weddell Weddell Sea |
geographic_facet |
Antarctic Dronning Maud Land Fimbulisen Jutulstraumen Southern Ocean Weddell Weddell Sea |
genre |
Antarc* Antarctic Antarctica Dronning Maud Land Ice Shelf Ice Shelves Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Antarctica Dronning Maud Land Ice Shelf Ice Shelves Southern Ocean Weddell Sea |
op_relation |
https://hdl.handle.net/1956/1061 https://doi.org/10.1029/2005jc002915 |
op_doi |
https://doi.org/10.1029/2005jc002915 |
container_title |
Journal of Geophysical Research |
container_volume |
111 |
container_issue |
C1 |
_version_ |
1766085602339454976 |