Interannual variability of the Ocean Circulation in the Atlantic-Arctic Ocean Gateways
The northward transport of warm and saline water from the Atlantic Ocean into the Arctic Ocean is a crucial element of the Arctic climate system. On its way north, the Atlantic Water (AW) is either transported through the Barents Sea (BS), a shallow Arctic shelf sea, or with the West Spitsbergen Cur...
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Universität Bremen
2024
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/7999 2024-09-15T17:53:17+00:00 Interannual variability of the Ocean Circulation in the Atlantic-Arctic Ocean Gateways Heukamp, Finn Ole Kanzow, Torsten Wekerle, Claudia Jung, Thomas 2024-05-24 application/pdf https://media.suub.uni-bremen.de/handle/elib/7999 https://doi.org/10.26092/elib/3037 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib79997 eng eng Universität Bremen Fachbereich 01: Physik/Elektrotechnik (FB 01) https://media.suub.uni-bremen.de/handle/elib/7999 https://doi.org/10.26092/elib/3037 doi:10.26092/elib/3037 urn:nbn:de:gbv:46-elib79997 info:eu-repo/semantics/openAccess CC BY 4.0 (Attribution) https://creativecommons.org/licenses/by/4.0/ Oceanography ocean modelling Arctic Ocean Arctic Amplification Barents Sea Fram Strait Atlantic Water 530 530 Physics ddc:530 Dissertation doctoralThesis 2024 ftsubbremen https://doi.org/10.26092/elib/3037 2024-07-24T01:45:25Z The northward transport of warm and saline water from the Atlantic Ocean into the Arctic Ocean is a crucial element of the Arctic climate system. On its way north, the Atlantic Water (AW) is either transported through the Barents Sea (BS), a shallow Arctic shelf sea, or with the West Spitsbergen Current through eastern Fram Strait (FS). The temperature and volume of the two-branched AW flow depict pronounced interannual variability, affecting the downstream water properties in the Arctic Ocean and the Arctic sea ice. In the first part of my thesis, I examine a potential positive feedback in the ice-ocean-atmosphere system of the BS. Using satellite data, atmospheric reanalysis, and a special setup of a global ocean and sea ice model I test whether the pronounced local decrease in sea ice in the BS can trigger a local feedback. It was hypothesized that reduced sea ice increases ocean-to-atmosphere heat flux, reduces the air pressure, alters the local wind field, and finally increases the warm water transport into the BS resulting in even less sea ice. The results of my study contradict the existence of this feedback but indicate that air pressure anomalies centered over the north-western BS can modify the Atlantic Water re-circulation in both, the Barents Sea Opening (BSO) and FS. In the second part of my thesis, I investigate the interannual variability of the transport through the BSO and its link to the North Atlantic Oscillation (NAO), using special setups of a global ocean and sea ice model. By combining different atmospheric forcing fields, the transport anomalies are split into local and upstream forced contributions. With the help of the simulations, I show that a previously detected loss of co-variability between the NAO and the BSO AW transport around the year 2000 can be attributed to the upstream forced BSO transport anomalies. These anomalies are strongly affected by atmospheric blocking events in this period. Atmospheric blocking deflects synoptic-scale cyclones that usually maintain the control of ... Doctoral or Postdoctoral Thesis Arctic Ocean Atlantic Arctic Atlantic-Arctic Barents Sea Fram Strait North Atlantic North Atlantic oscillation Sea ice Spitsbergen Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
Oceanography ocean modelling Arctic Ocean Arctic Amplification Barents Sea Fram Strait Atlantic Water 530 530 Physics ddc:530 |
spellingShingle |
Oceanography ocean modelling Arctic Ocean Arctic Amplification Barents Sea Fram Strait Atlantic Water 530 530 Physics ddc:530 Heukamp, Finn Ole Interannual variability of the Ocean Circulation in the Atlantic-Arctic Ocean Gateways |
topic_facet |
Oceanography ocean modelling Arctic Ocean Arctic Amplification Barents Sea Fram Strait Atlantic Water 530 530 Physics ddc:530 |
description |
The northward transport of warm and saline water from the Atlantic Ocean into the Arctic Ocean is a crucial element of the Arctic climate system. On its way north, the Atlantic Water (AW) is either transported through the Barents Sea (BS), a shallow Arctic shelf sea, or with the West Spitsbergen Current through eastern Fram Strait (FS). The temperature and volume of the two-branched AW flow depict pronounced interannual variability, affecting the downstream water properties in the Arctic Ocean and the Arctic sea ice. In the first part of my thesis, I examine a potential positive feedback in the ice-ocean-atmosphere system of the BS. Using satellite data, atmospheric reanalysis, and a special setup of a global ocean and sea ice model I test whether the pronounced local decrease in sea ice in the BS can trigger a local feedback. It was hypothesized that reduced sea ice increases ocean-to-atmosphere heat flux, reduces the air pressure, alters the local wind field, and finally increases the warm water transport into the BS resulting in even less sea ice. The results of my study contradict the existence of this feedback but indicate that air pressure anomalies centered over the north-western BS can modify the Atlantic Water re-circulation in both, the Barents Sea Opening (BSO) and FS. In the second part of my thesis, I investigate the interannual variability of the transport through the BSO and its link to the North Atlantic Oscillation (NAO), using special setups of a global ocean and sea ice model. By combining different atmospheric forcing fields, the transport anomalies are split into local and upstream forced contributions. With the help of the simulations, I show that a previously detected loss of co-variability between the NAO and the BSO AW transport around the year 2000 can be attributed to the upstream forced BSO transport anomalies. These anomalies are strongly affected by atmospheric blocking events in this period. Atmospheric blocking deflects synoptic-scale cyclones that usually maintain the control of ... |
author2 |
Kanzow, Torsten Wekerle, Claudia Jung, Thomas |
format |
Doctoral or Postdoctoral Thesis |
author |
Heukamp, Finn Ole |
author_facet |
Heukamp, Finn Ole |
author_sort |
Heukamp, Finn Ole |
title |
Interannual variability of the Ocean Circulation in the Atlantic-Arctic Ocean Gateways |
title_short |
Interannual variability of the Ocean Circulation in the Atlantic-Arctic Ocean Gateways |
title_full |
Interannual variability of the Ocean Circulation in the Atlantic-Arctic Ocean Gateways |
title_fullStr |
Interannual variability of the Ocean Circulation in the Atlantic-Arctic Ocean Gateways |
title_full_unstemmed |
Interannual variability of the Ocean Circulation in the Atlantic-Arctic Ocean Gateways |
title_sort |
interannual variability of the ocean circulation in the atlantic-arctic ocean gateways |
publisher |
Universität Bremen |
publishDate |
2024 |
url |
https://media.suub.uni-bremen.de/handle/elib/7999 https://doi.org/10.26092/elib/3037 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib79997 |
genre |
Arctic Ocean Atlantic Arctic Atlantic-Arctic Barents Sea Fram Strait North Atlantic North Atlantic oscillation Sea ice Spitsbergen |
genre_facet |
Arctic Ocean Atlantic Arctic Atlantic-Arctic Barents Sea Fram Strait North Atlantic North Atlantic oscillation Sea ice Spitsbergen |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/7999 https://doi.org/10.26092/elib/3037 doi:10.26092/elib/3037 urn:nbn:de:gbv:46-elib79997 |
op_rights |
info:eu-repo/semantics/openAccess CC BY 4.0 (Attribution) https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.26092/elib/3037 |
_version_ |
1810295312196042752 |