Circulation and transformation of Atlantic and Arctic water masses in climate models
Ocean heat transport and associated heat loss to the atmosphere contributes significantly to the anomalously mild climate of northwestern Europe and its variability. In this thesis, the circulation and transformation of water masses in the northern North Atlantic and the Nordic Seas have been assess...
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Language: | English |
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The University of Bergen
2011
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Online Access: | https://hdl.handle.net/1956/5282 |
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ftunivbergen:oai:bora.uib.no:1956/5282 2023-05-15T14:28:11+02:00 Circulation and transformation of Atlantic and Arctic water masses in climate models Langehaug, Helene Reinertsen 2011-12-09 application/pdf https://hdl.handle.net/1956/5282 eng eng The University of Bergen Paper I: Langehaug H. R., P. B. Rhines, T. Eldevik, J. Mignot, and K. Lohmann, 2011: Water mass transformation and the North Atlantic Current in three multi-century climate model simulations. The article is available at: http://hdl.handle.net/1956/5278 Paper II: Langehaug, H. R., I. Medhaug, T. Eldevik, and O. H. Otterå, 2011: Arctic/ Atlantic exchanges via the Subpolar Gyre. The article is available at: http://hdl.handle.net/1956/5279 Paper III: Medhaug, I., H. R. Langehaug, T. Eldevik, T. Furevik, and M. Bentsen, 2011: Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation, Climate Dynamics, in press. Full text not available in BORA due to publisher restrictions. The article is available at: http://dx.doi.org/10.1007/s00382-011-1124-z Paper IV: Langehaug, H. R. and E. Falck, 2011: Changes in the properties and distribution of the intermediate and deep waters in the Fram Strait. The article is available at: http://hdl.handle.net/1956/5280 urn:isbn:978-82-308-1903-6 (print version) https://hdl.handle.net/1956/5282 Copyright the authors. All rights reserved VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Doctoral thesis 2011 ftunivbergen https://doi.org/10.1007/s00382-011-1124-z 2023-03-14T17:39:10Z Ocean heat transport and associated heat loss to the atmosphere contributes significantly to the anomalously mild climate of northwestern Europe and its variability. In this thesis, the circulation and transformation of water masses in the northern North Atlantic and the Nordic Seas have been assessed and explored in state-of-the-art climate models. A most important aspect of model evaluation is to identify the degree of realism in model climatology and variability, e.g., for model improvement or in order to assess the potential for decadal-scale climate prediction. A main approach for assessing simulated ocean circulations herein is water mass analysis as routinely applied in observational oceanography. Air-sea exchange and water mass transformation at northern high latitudes are accordingly related to the Atlantic Meridional Overturning Circulation (AMOC). The variable overturning of the Bergen Climate Model (BCM) – the core model system in this thesis – is found to reflect decadal variability in dense water formation in the Labrador Sea and in the oceanic heat transport into the Nordic Seas, the overall constraint on the northernmost water mass transformation. The simulated AMOC is strongly interconnected with the horizontal Subpolar Gyre circulation. Decadal variability of BCM’s Subpolar Gyre, as its AMOC, can partly be explained as a response to distinct patterns of atmospheric variability. The intercomparison of BCM with two other climate models finds the model pathways for the North Atlantic Current and the model sea-ice covers to differ substantially, and hence their oceanic poleward transport of heat, their air-sea exchange, and consequent northern water mass transformation to be very different. Doctoral or Postdoctoral Thesis Arctic Arctic Labrador Sea Nordic Seas north atlantic current North Atlantic Sea ice University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Bergen Climate Dynamics 39 1-2 77 93 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
spellingShingle |
VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 Langehaug, Helene Reinertsen Circulation and transformation of Atlantic and Arctic water masses in climate models |
topic_facet |
VDP::Mathematics and natural science: 400::Geosciences: 450::Oceanography: 452 |
description |
Ocean heat transport and associated heat loss to the atmosphere contributes significantly to the anomalously mild climate of northwestern Europe and its variability. In this thesis, the circulation and transformation of water masses in the northern North Atlantic and the Nordic Seas have been assessed and explored in state-of-the-art climate models. A most important aspect of model evaluation is to identify the degree of realism in model climatology and variability, e.g., for model improvement or in order to assess the potential for decadal-scale climate prediction. A main approach for assessing simulated ocean circulations herein is water mass analysis as routinely applied in observational oceanography. Air-sea exchange and water mass transformation at northern high latitudes are accordingly related to the Atlantic Meridional Overturning Circulation (AMOC). The variable overturning of the Bergen Climate Model (BCM) – the core model system in this thesis – is found to reflect decadal variability in dense water formation in the Labrador Sea and in the oceanic heat transport into the Nordic Seas, the overall constraint on the northernmost water mass transformation. The simulated AMOC is strongly interconnected with the horizontal Subpolar Gyre circulation. Decadal variability of BCM’s Subpolar Gyre, as its AMOC, can partly be explained as a response to distinct patterns of atmospheric variability. The intercomparison of BCM with two other climate models finds the model pathways for the North Atlantic Current and the model sea-ice covers to differ substantially, and hence their oceanic poleward transport of heat, their air-sea exchange, and consequent northern water mass transformation to be very different. |
format |
Doctoral or Postdoctoral Thesis |
author |
Langehaug, Helene Reinertsen |
author_facet |
Langehaug, Helene Reinertsen |
author_sort |
Langehaug, Helene Reinertsen |
title |
Circulation and transformation of Atlantic and Arctic water masses in climate models |
title_short |
Circulation and transformation of Atlantic and Arctic water masses in climate models |
title_full |
Circulation and transformation of Atlantic and Arctic water masses in climate models |
title_fullStr |
Circulation and transformation of Atlantic and Arctic water masses in climate models |
title_full_unstemmed |
Circulation and transformation of Atlantic and Arctic water masses in climate models |
title_sort |
circulation and transformation of atlantic and arctic water masses in climate models |
publisher |
The University of Bergen |
publishDate |
2011 |
url |
https://hdl.handle.net/1956/5282 |
geographic |
Arctic Bergen |
geographic_facet |
Arctic Bergen |
genre |
Arctic Arctic Labrador Sea Nordic Seas north atlantic current North Atlantic Sea ice |
genre_facet |
Arctic Arctic Labrador Sea Nordic Seas north atlantic current North Atlantic Sea ice |
op_relation |
Paper I: Langehaug H. R., P. B. Rhines, T. Eldevik, J. Mignot, and K. Lohmann, 2011: Water mass transformation and the North Atlantic Current in three multi-century climate model simulations. The article is available at: http://hdl.handle.net/1956/5278 Paper II: Langehaug, H. R., I. Medhaug, T. Eldevik, and O. H. Otterå, 2011: Arctic/ Atlantic exchanges via the Subpolar Gyre. The article is available at: http://hdl.handle.net/1956/5279 Paper III: Medhaug, I., H. R. Langehaug, T. Eldevik, T. Furevik, and M. Bentsen, 2011: Mechanisms for decadal scale variability in a simulated Atlantic Meridional Overturning Circulation, Climate Dynamics, in press. Full text not available in BORA due to publisher restrictions. The article is available at: http://dx.doi.org/10.1007/s00382-011-1124-z Paper IV: Langehaug, H. R. and E. Falck, 2011: Changes in the properties and distribution of the intermediate and deep waters in the Fram Strait. The article is available at: http://hdl.handle.net/1956/5280 urn:isbn:978-82-308-1903-6 (print version) https://hdl.handle.net/1956/5282 |
op_rights |
Copyright the authors. All rights reserved |
op_doi |
https://doi.org/10.1007/s00382-011-1124-z |
container_title |
Climate Dynamics |
container_volume |
39 |
container_issue |
1-2 |
container_start_page |
77 |
op_container_end_page |
93 |
_version_ |
1766302345170255872 |