Dynamics of the Canadian Arctic Archipelago throughflow: A numerical study with a finite element sea ice and ocean model
The Canadian Arctic Archipelago (CAA) connects the Arctic Ocean and Baffin Bay through narrow channels and is one of the key gateways where freshwater leaves the Arctic. It has therefore the potential to affect the deep convection in the northern North Atlantic. Representing the CAA in traditional g...
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Language: | English |
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Universität Bremen
2013
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Online Access: | https://media.suub.uni-bremen.de/handle/elib/543 https://nbn-resolving.org/urn:nbn:de:gbv:46-00103421-10 |
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/543 2023-05-15T14:28:50+02:00 Dynamics of the Canadian Arctic Archipelago throughflow: A numerical study with a finite element sea ice and ocean model Dynamik des Durchflusses durch das kanadisch-arktische Archipel: Eine numerische Studie mit einem Finite Elemente Ozean- und Meereismodell Wekerle, Claudia Lemke, Peter Wang, Qiang Jung, Thomas 2013-09-13 application/pdf https://media.suub.uni-bremen.de/handle/elib/543 https://nbn-resolving.org/urn:nbn:de:gbv:46-00103421-10 eng eng Universität Bremen FB1 Physik/Elektrotechnik https://media.suub.uni-bremen.de/handle/elib/543 urn:nbn:de:gbv:46-00103421-10 info:eu-repo/semantics/openAccess ocean modeling Arctic freshwater exports 530 530 Physics ddc:530 Dissertation doctoralThesis 2013 ftsubbremen 2022-11-09T07:09:23Z The Canadian Arctic Archipelago (CAA) connects the Arctic Ocean and Baffin Bay through narrow channels and is one of the key gateways where freshwater leaves the Arctic. It has therefore the potential to affect the deep convection in the northern North Atlantic. Representing the CAA in traditional global models still poses a challenge due to the small scale nature of the narrow passages. In this study we apply a global, multi-resolution sea ice ocean model (the Finite Element Sea ice Ocean Model, FESOM) with refinement in the CAA up to 5 km, while keeping a coarse resolution setup otherwise. With this model setup, a hindcast simulation for the period 1968-2007 was performed. The first goal of this thesis is to assess the model behavior in the CAA region and in the Arctic Ocean. The model assessment revealed good agreement with sea ice conditions in the Arctic Ocean and with fluxes through the main gates of the Arctic Ocean. During the period 1968-2007 the mean volume transports through Lancaster Sound and Nares Strait amount to 0.86 Sv (1 Sv = 10^6 m^3/s) and 0.91 Sv, respectively. The monthly mean volume transport through western Lancaster Sound is highly correlated with the observational estimate (r=0.81). A comparison of simulated sectionally averaged velocities in Nares Strait with observational estimates reveals good agreement (r=0.57). The simulated mean CAA freshwater export rate is 123 mSv, slightly higher than the observational estimate (101 -10 mSv). The local refinement of 5 km allows to investigate the freshwater contribution of individual narrow straits to the Parry Channel. In the second part of the thesis, the mechanisms driving the interannual variability of freshwater transports through the CAA are analyzed. The interannual variability is determined by sea surface height (SSH) gradients between the Arctic Ocean and northern Baffin Bay. The variability of fluxes through Lancaster Sound and Nares Strait is mainly determined by that of the SSH on the shelf along the Beaufort Sea coast and in the ... Doctoral or Postdoctoral Thesis Arctic Archipelago Arctic Arctic Ocean Arktis* Baffin Bay Baffin Bay Baffin Beaufort Sea Canadian Arctic Archipelago kanadisch-arktische Archipel Lancaster Sound Nares strait North Atlantic Parry Channel Sea ice Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Arctic Arctic Ocean Baffin Bay Canadian Arctic Archipelago Lancaster Sound ENVELOPE(-83.999,-83.999,74.218,74.218) Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Parry ENVELOPE(-62.417,-62.417,-64.283,-64.283) |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
ocean modeling Arctic freshwater exports 530 530 Physics ddc:530 |
spellingShingle |
ocean modeling Arctic freshwater exports 530 530 Physics ddc:530 Wekerle, Claudia Dynamics of the Canadian Arctic Archipelago throughflow: A numerical study with a finite element sea ice and ocean model |
topic_facet |
ocean modeling Arctic freshwater exports 530 530 Physics ddc:530 |
description |
The Canadian Arctic Archipelago (CAA) connects the Arctic Ocean and Baffin Bay through narrow channels and is one of the key gateways where freshwater leaves the Arctic. It has therefore the potential to affect the deep convection in the northern North Atlantic. Representing the CAA in traditional global models still poses a challenge due to the small scale nature of the narrow passages. In this study we apply a global, multi-resolution sea ice ocean model (the Finite Element Sea ice Ocean Model, FESOM) with refinement in the CAA up to 5 km, while keeping a coarse resolution setup otherwise. With this model setup, a hindcast simulation for the period 1968-2007 was performed. The first goal of this thesis is to assess the model behavior in the CAA region and in the Arctic Ocean. The model assessment revealed good agreement with sea ice conditions in the Arctic Ocean and with fluxes through the main gates of the Arctic Ocean. During the period 1968-2007 the mean volume transports through Lancaster Sound and Nares Strait amount to 0.86 Sv (1 Sv = 10^6 m^3/s) and 0.91 Sv, respectively. The monthly mean volume transport through western Lancaster Sound is highly correlated with the observational estimate (r=0.81). A comparison of simulated sectionally averaged velocities in Nares Strait with observational estimates reveals good agreement (r=0.57). The simulated mean CAA freshwater export rate is 123 mSv, slightly higher than the observational estimate (101 -10 mSv). The local refinement of 5 km allows to investigate the freshwater contribution of individual narrow straits to the Parry Channel. In the second part of the thesis, the mechanisms driving the interannual variability of freshwater transports through the CAA are analyzed. The interannual variability is determined by sea surface height (SSH) gradients between the Arctic Ocean and northern Baffin Bay. The variability of fluxes through Lancaster Sound and Nares Strait is mainly determined by that of the SSH on the shelf along the Beaufort Sea coast and in the ... |
author2 |
Lemke, Peter Wang, Qiang Jung, Thomas |
format |
Doctoral or Postdoctoral Thesis |
author |
Wekerle, Claudia |
author_facet |
Wekerle, Claudia |
author_sort |
Wekerle, Claudia |
title |
Dynamics of the Canadian Arctic Archipelago throughflow: A numerical study with a finite element sea ice and ocean model |
title_short |
Dynamics of the Canadian Arctic Archipelago throughflow: A numerical study with a finite element sea ice and ocean model |
title_full |
Dynamics of the Canadian Arctic Archipelago throughflow: A numerical study with a finite element sea ice and ocean model |
title_fullStr |
Dynamics of the Canadian Arctic Archipelago throughflow: A numerical study with a finite element sea ice and ocean model |
title_full_unstemmed |
Dynamics of the Canadian Arctic Archipelago throughflow: A numerical study with a finite element sea ice and ocean model |
title_sort |
dynamics of the canadian arctic archipelago throughflow: a numerical study with a finite element sea ice and ocean model |
publisher |
Universität Bremen |
publishDate |
2013 |
url |
https://media.suub.uni-bremen.de/handle/elib/543 https://nbn-resolving.org/urn:nbn:de:gbv:46-00103421-10 |
long_lat |
ENVELOPE(-83.999,-83.999,74.218,74.218) ENVELOPE(158.167,158.167,-81.450,-81.450) ENVELOPE(-62.417,-62.417,-64.283,-64.283) |
geographic |
Arctic Arctic Ocean Baffin Bay Canadian Arctic Archipelago Lancaster Sound Nares Parry |
geographic_facet |
Arctic Arctic Ocean Baffin Bay Canadian Arctic Archipelago Lancaster Sound Nares Parry |
genre |
Arctic Archipelago Arctic Arctic Ocean Arktis* Baffin Bay Baffin Bay Baffin Beaufort Sea Canadian Arctic Archipelago kanadisch-arktische Archipel Lancaster Sound Nares strait North Atlantic Parry Channel Sea ice |
genre_facet |
Arctic Archipelago Arctic Arctic Ocean Arktis* Baffin Bay Baffin Bay Baffin Beaufort Sea Canadian Arctic Archipelago kanadisch-arktische Archipel Lancaster Sound Nares strait North Atlantic Parry Channel Sea ice |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/543 urn:nbn:de:gbv:46-00103421-10 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766302982221070336 |