Einfluss arktischer Süßwasserquellen auf die Zirkulation im Nordmeer und im Nordatlantik in einem prognostischen Ozean-Meereis-Modell
The thesis documents the design and development of a three-dimensional prognostic ocean/sea-ice model of the Arctic Mediterranean and the North Atlantic. The model has been set up on the basis of the z-coordinate ocean model MOM 2 coupled to a dynamic/thermodynamic sea-ice model with viscous-plastic...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | German |
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Universität Bremen
2003
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Online Access: | https://media.suub.uni-bremen.de/handle/elib/1918 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000006238 |
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/1918 2023-05-15T14:29:01+02:00 Einfluss arktischer Süßwasserquellen auf die Zirkulation im Nordmeer und im Nordatlantik in einem prognostischen Ozean-Meereis-Modell Influence of Arctic Freshwater Sources on the Circulation in the Arctic Mediterranean and the North Atlantic in a Prognostic Ocean/Sea-Ice Model Prange, Matthias Olbers, Dirk Schulz, Michael 2003-07-25 application/pdf https://media.suub.uni-bremen.de/handle/elib/1918 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000006238 ger ger Universität Bremen FB1 Physik/Elektrotechnik https://media.suub.uni-bremen.de/handle/elib/1918 urn:nbn:de:gbv:46-diss000006238 info:eu-repo/semantics/openAccess Bitte wählen Sie eine Lizenz aus: (Unsere Empfehlung: CC-BY) CC-BY Arctic Ocean Nordic Seas North Atlantic Bering Strait Fram Strait ocean modelling sea-ice modelling ocean dynamics hydrology 80 ddc:80 Dissertation doctoralThesis 2003 ftsubbremen 2022-11-09T07:09:41Z The thesis documents the design and development of a three-dimensional prognostic ocean/sea-ice model of the Arctic Mediterranean and the North Atlantic. The model has been set up on the basis of the z-coordinate ocean model MOM 2 coupled to a dynamic/thermodynamic sea-ice model with viscous-plastic rheology. Adding arctic freshwater sources step by step leads to a progressive improvement of the coupled model, and allows to analyse the sensitivity of the ocean/sea-ice system with respect to freshwater forcing. The results reveal that freshwater plays a major role in Arctic Ocean dynamics. In particular, the path of the Transpolar Drift and the strength of the East Greenland Current in the western Fram Strait are strongly influenced by the input of freshwater. Thus, freshwater favours the exchange of water masses between the Nordic Seas and the Arctic Ocean. Moreover, freshwater input controls vertical oceanic heat fluxes into the ice by forming a stable density stratification. The model requires a total freshwater input of approx. 6800 km^3/yr to the Arctic Ocean in order to maintain a realistic hydrography. More than 40% of this freshwater leaves the Arctic Ocean as sea-ice through Fram Strait. The sum of liquid freshwater exports through Fram Strait and the Canadian Arctic Archipelago is of similar magnitude (c. 1500 km^3/yr through each passage). Taking the volume input of surface freshwater fluxes into account by applying an open surface, the model presented here is superior to other models of the Arctic Mediterranean, which are driven by virtual salinity fluxes. Experiments with different salinity/freshwater flux boundary conditions reveal the shortcomings of salinity-flux formulations. It is concluded that other prognostic models of the Arctic Ocean can be improved substantially by implementing an open surface. Doctoral or Postdoctoral Thesis Arctic Archipelago Arctic Arctic Ocean Arktis* Bering Strait Canadian Arctic Archipelago East Greenland east greenland current Fram Strait Greenland Nordic Seas North Atlantic Sea ice Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Arctic Arctic Ocean Bering Strait Canadian Arctic Archipelago Greenland |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
German |
topic |
Arctic Ocean Nordic Seas North Atlantic Bering Strait Fram Strait ocean modelling sea-ice modelling ocean dynamics hydrology 80 ddc:80 |
spellingShingle |
Arctic Ocean Nordic Seas North Atlantic Bering Strait Fram Strait ocean modelling sea-ice modelling ocean dynamics hydrology 80 ddc:80 Prange, Matthias Einfluss arktischer Süßwasserquellen auf die Zirkulation im Nordmeer und im Nordatlantik in einem prognostischen Ozean-Meereis-Modell |
topic_facet |
Arctic Ocean Nordic Seas North Atlantic Bering Strait Fram Strait ocean modelling sea-ice modelling ocean dynamics hydrology 80 ddc:80 |
description |
The thesis documents the design and development of a three-dimensional prognostic ocean/sea-ice model of the Arctic Mediterranean and the North Atlantic. The model has been set up on the basis of the z-coordinate ocean model MOM 2 coupled to a dynamic/thermodynamic sea-ice model with viscous-plastic rheology. Adding arctic freshwater sources step by step leads to a progressive improvement of the coupled model, and allows to analyse the sensitivity of the ocean/sea-ice system with respect to freshwater forcing. The results reveal that freshwater plays a major role in Arctic Ocean dynamics. In particular, the path of the Transpolar Drift and the strength of the East Greenland Current in the western Fram Strait are strongly influenced by the input of freshwater. Thus, freshwater favours the exchange of water masses between the Nordic Seas and the Arctic Ocean. Moreover, freshwater input controls vertical oceanic heat fluxes into the ice by forming a stable density stratification. The model requires a total freshwater input of approx. 6800 km^3/yr to the Arctic Ocean in order to maintain a realistic hydrography. More than 40% of this freshwater leaves the Arctic Ocean as sea-ice through Fram Strait. The sum of liquid freshwater exports through Fram Strait and the Canadian Arctic Archipelago is of similar magnitude (c. 1500 km^3/yr through each passage). Taking the volume input of surface freshwater fluxes into account by applying an open surface, the model presented here is superior to other models of the Arctic Mediterranean, which are driven by virtual salinity fluxes. Experiments with different salinity/freshwater flux boundary conditions reveal the shortcomings of salinity-flux formulations. It is concluded that other prognostic models of the Arctic Ocean can be improved substantially by implementing an open surface. |
author2 |
Olbers, Dirk Schulz, Michael |
format |
Doctoral or Postdoctoral Thesis |
author |
Prange, Matthias |
author_facet |
Prange, Matthias |
author_sort |
Prange, Matthias |
title |
Einfluss arktischer Süßwasserquellen auf die Zirkulation im Nordmeer und im Nordatlantik in einem prognostischen Ozean-Meereis-Modell |
title_short |
Einfluss arktischer Süßwasserquellen auf die Zirkulation im Nordmeer und im Nordatlantik in einem prognostischen Ozean-Meereis-Modell |
title_full |
Einfluss arktischer Süßwasserquellen auf die Zirkulation im Nordmeer und im Nordatlantik in einem prognostischen Ozean-Meereis-Modell |
title_fullStr |
Einfluss arktischer Süßwasserquellen auf die Zirkulation im Nordmeer und im Nordatlantik in einem prognostischen Ozean-Meereis-Modell |
title_full_unstemmed |
Einfluss arktischer Süßwasserquellen auf die Zirkulation im Nordmeer und im Nordatlantik in einem prognostischen Ozean-Meereis-Modell |
title_sort |
einfluss arktischer süßwasserquellen auf die zirkulation im nordmeer und im nordatlantik in einem prognostischen ozean-meereis-modell |
publisher |
Universität Bremen |
publishDate |
2003 |
url |
https://media.suub.uni-bremen.de/handle/elib/1918 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000006238 |
geographic |
Arctic Arctic Ocean Bering Strait Canadian Arctic Archipelago Greenland |
geographic_facet |
Arctic Arctic Ocean Bering Strait Canadian Arctic Archipelago Greenland |
genre |
Arctic Archipelago Arctic Arctic Ocean Arktis* Bering Strait Canadian Arctic Archipelago East Greenland east greenland current Fram Strait Greenland Nordic Seas North Atlantic Sea ice |
genre_facet |
Arctic Archipelago Arctic Arctic Ocean Arktis* Bering Strait Canadian Arctic Archipelago East Greenland east greenland current Fram Strait Greenland Nordic Seas North Atlantic Sea ice |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/1918 urn:nbn:de:gbv:46-diss000006238 |
op_rights |
info:eu-repo/semantics/openAccess Bitte wählen Sie eine Lizenz aus: (Unsere Empfehlung: CC-BY) |
op_rightsnorm |
CC-BY |
_version_ |
1766303120364666880 |