Variability of the ice-ocean system in the Pacific sector of the Southern Ocean: Numerical model studies
In the framework of BRIOS (Bremerhaven Ice Ocean Simulations) a coupled ice-ocean model of the Southern Ocean was adapted to investigate the variability of the ice-ocean system in the Pacific sector of the Southern Ocean with a particular focus on the factors affecting dense water formation on the R...
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Universität Bremen
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/1968 2023-05-15T13:24:18+02:00 Variability of the ice-ocean system in the Pacific sector of the Southern Ocean: Numerical model studies Variabilitaet des Eis-Ozean Systems im Pazifischen Sektor des Suedpolarmeeres: Studien mit einem numerischen Modell Assmann, Karen Olbers, Dirk Lemke, Peter 2004-02-05 application/pdf https://media.suub.uni-bremen.de/handle/elib/1968 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000007901 eng eng Universität Bremen FB1 Physik/Elektrotechnik https://media.suub.uni-bremen.de/handle/elib/1968 urn:nbn:de:gbv:46-diss000007901 info:eu-repo/semantics/openAccess Antarktica numerical modelling ocean sea ice ice shelf 29 ddc:29 Dissertation doctoralThesis 2004 ftsubbremen 2022-11-09T07:09:42Z In the framework of BRIOS (Bremerhaven Ice Ocean Simulations) a coupled ice-ocean model of the Southern Ocean was adapted to investigate the variability of the ice-ocean system in the Pacific sector of the Southern Ocean with a particular focus on the factors affecting dense water formation on the Ross Sea continental shelf. The sea ice regimes in the western and eastern Ross Sea were shown to be decoupled from each other with sea ice characteristics in the western Ross Sea determined predominantly by the local atmospheric conditions and those in the eastern Ross Sea by ice import from the Amundsen Sea. The resulting strong gradient in sea ice formation provides the thermohaline driving force for the shelf circulation. The cooling, salt input and subsequent deep convection during the seasonal cycle modifies the waters of the shelf inflow so that their density is sufficient participate in Antarctic Bottom Water formation.Model results show that the region around Ross Island and McMurdo Sound has a key role in controlling the exchange between the ice shelf cavity and the open ocean in the Ross Sea. Drainage of High Salinity Shelf Water through McMurdo Sound into the cavity in winter prevents brine accumulation and thus lowers High Salinity Shelf Water salinities to the range observed. This also affects the balance of Ice Shelf Water and High Salinity Shelf Water, the two parent water masses for the formation of Antarctic Bottom Water in the Ross Sea. The interannual variability of dense water characteristics is, however, predominantly controlled by variations in the shelf inflow through a sub-surface salinity and a deep temperature signal whose origin can be traced into the Amundsen and Bellingshausen Seas. The temperature anomalies are induced in the western Bellingshausen Sea where the meridional transport of Circumpolar Deep Water causes temperature anomalies at the continental shelf break. Doctoral or Postdoctoral Thesis Amundsen Sea Antarc* Antarctic Bellingshausen Sea Ice Shelf McMurdo Sound Ross Island Ross Sea Sea ice Southern Ocean Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Amundsen Sea Antarctic Bellingshausen Sea McMurdo Sound Pacific Ross Island Ross Sea Southern Ocean |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Antarktica numerical modelling ocean sea ice ice shelf 29 ddc:29 |
spellingShingle |
Antarktica numerical modelling ocean sea ice ice shelf 29 ddc:29 Assmann, Karen Variability of the ice-ocean system in the Pacific sector of the Southern Ocean: Numerical model studies |
topic_facet |
Antarktica numerical modelling ocean sea ice ice shelf 29 ddc:29 |
description |
In the framework of BRIOS (Bremerhaven Ice Ocean Simulations) a coupled ice-ocean model of the Southern Ocean was adapted to investigate the variability of the ice-ocean system in the Pacific sector of the Southern Ocean with a particular focus on the factors affecting dense water formation on the Ross Sea continental shelf. The sea ice regimes in the western and eastern Ross Sea were shown to be decoupled from each other with sea ice characteristics in the western Ross Sea determined predominantly by the local atmospheric conditions and those in the eastern Ross Sea by ice import from the Amundsen Sea. The resulting strong gradient in sea ice formation provides the thermohaline driving force for the shelf circulation. The cooling, salt input and subsequent deep convection during the seasonal cycle modifies the waters of the shelf inflow so that their density is sufficient participate in Antarctic Bottom Water formation.Model results show that the region around Ross Island and McMurdo Sound has a key role in controlling the exchange between the ice shelf cavity and the open ocean in the Ross Sea. Drainage of High Salinity Shelf Water through McMurdo Sound into the cavity in winter prevents brine accumulation and thus lowers High Salinity Shelf Water salinities to the range observed. This also affects the balance of Ice Shelf Water and High Salinity Shelf Water, the two parent water masses for the formation of Antarctic Bottom Water in the Ross Sea. The interannual variability of dense water characteristics is, however, predominantly controlled by variations in the shelf inflow through a sub-surface salinity and a deep temperature signal whose origin can be traced into the Amundsen and Bellingshausen Seas. The temperature anomalies are induced in the western Bellingshausen Sea where the meridional transport of Circumpolar Deep Water causes temperature anomalies at the continental shelf break. |
author2 |
Olbers, Dirk Lemke, Peter |
format |
Doctoral or Postdoctoral Thesis |
author |
Assmann, Karen |
author_facet |
Assmann, Karen |
author_sort |
Assmann, Karen |
title |
Variability of the ice-ocean system in the Pacific sector of the Southern Ocean: Numerical model studies |
title_short |
Variability of the ice-ocean system in the Pacific sector of the Southern Ocean: Numerical model studies |
title_full |
Variability of the ice-ocean system in the Pacific sector of the Southern Ocean: Numerical model studies |
title_fullStr |
Variability of the ice-ocean system in the Pacific sector of the Southern Ocean: Numerical model studies |
title_full_unstemmed |
Variability of the ice-ocean system in the Pacific sector of the Southern Ocean: Numerical model studies |
title_sort |
variability of the ice-ocean system in the pacific sector of the southern ocean: numerical model studies |
publisher |
Universität Bremen |
publishDate |
2004 |
url |
https://media.suub.uni-bremen.de/handle/elib/1968 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000007901 |
geographic |
Amundsen Sea Antarctic Bellingshausen Sea McMurdo Sound Pacific Ross Island Ross Sea Southern Ocean |
geographic_facet |
Amundsen Sea Antarctic Bellingshausen Sea McMurdo Sound Pacific Ross Island Ross Sea Southern Ocean |
genre |
Amundsen Sea Antarc* Antarctic Bellingshausen Sea Ice Shelf McMurdo Sound Ross Island Ross Sea Sea ice Southern Ocean |
genre_facet |
Amundsen Sea Antarc* Antarctic Bellingshausen Sea Ice Shelf McMurdo Sound Ross Island Ross Sea Sea ice Southern Ocean |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/1968 urn:nbn:de:gbv:46-diss000007901 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766378572430180352 |