Water mass transformation and the North Atlantic Current in three multicentury climate model simulations
The warm and saline Subtropical Water carried by the North Atlantic Current undergoes substantial transformation on its way to higher latitudes, predominantly from oceanic heat loss to the atmosphere. The geographical distribution of the surface forced water mass transformation is assessed in multic...
Published in: | Journal of Geophysical Research: Oceans |
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ftpubman:oai:pure.mpg.de:item_1574945 2024-09-15T18:17:17+00:00 Water mass transformation and the North Atlantic Current in three multicentury climate model simulations Langehaug, H. Rhines, P. Eldevik, T. Mignot, J. Lohmann, K. 2012-11 application/pdf http://hdl.handle.net/11858/00-001M-0000-0010-3A67-C http://hdl.handle.net/11858/00-001M-0000-0014-1D2D-2 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1029/2012JC008021 http://hdl.handle.net/11858/00-001M-0000-0010-3A67-C http://hdl.handle.net/11858/00-001M-0000-0014-1D2D-2 info:eu-repo/semantics/openAccess Journal of Geophysical Research-Oceans info:eu-repo/semantics/article 2012 ftpubman https://doi.org/10.1029/2012JC008021 2024-07-31T09:31:26Z The warm and saline Subtropical Water carried by the North Atlantic Current undergoes substantial transformation on its way to higher latitudes, predominantly from oceanic heat loss to the atmosphere. The geographical distribution of the surface forced water mass transformation is assessed in multicentury climate simulations from three different climate models (BCM, IPSLCM4, and MPI-M ESM), with a particular focus on the eastern subpolar North Atlantic Ocean. A diagnosis, originally introduced by Walin (1982), estimates the surface water mass transformation from buoyancy forcing. While the depth structure of the Atlantic Meridional Overturning Circulation (AMOC) is similar in all models, their climatological heat and freshwater fluxes are very different. Consistently, the models differ in their mean pathways of the North Atlantic Current, location of upper ocean low salinity waters, as well as in sea ice cover. In the two models with an excessive sea ice extent in the Labrador Sea, most of the water mass transformation in the subpolar region occurs in the eastern part (east of 35 degrees W). The variability of the eastern water mass transformation on decadal time scales is related to the variable warm northward flow into the subpolar region, the upper branch of AMOC, where a strengthened flow leads an intensified transformation. This relationship seems to disappear with a weak connection between the Subtropical and Subpolar gyres. Article in Journal/Newspaper Labrador Sea north atlantic current North Atlantic Sea ice Max Planck Society: MPG.PuRe Journal of Geophysical Research: Oceans 117 C11 n/a n/a |
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Max Planck Society: MPG.PuRe |
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language |
English |
description |
The warm and saline Subtropical Water carried by the North Atlantic Current undergoes substantial transformation on its way to higher latitudes, predominantly from oceanic heat loss to the atmosphere. The geographical distribution of the surface forced water mass transformation is assessed in multicentury climate simulations from three different climate models (BCM, IPSLCM4, and MPI-M ESM), with a particular focus on the eastern subpolar North Atlantic Ocean. A diagnosis, originally introduced by Walin (1982), estimates the surface water mass transformation from buoyancy forcing. While the depth structure of the Atlantic Meridional Overturning Circulation (AMOC) is similar in all models, their climatological heat and freshwater fluxes are very different. Consistently, the models differ in their mean pathways of the North Atlantic Current, location of upper ocean low salinity waters, as well as in sea ice cover. In the two models with an excessive sea ice extent in the Labrador Sea, most of the water mass transformation in the subpolar region occurs in the eastern part (east of 35 degrees W). The variability of the eastern water mass transformation on decadal time scales is related to the variable warm northward flow into the subpolar region, the upper branch of AMOC, where a strengthened flow leads an intensified transformation. This relationship seems to disappear with a weak connection between the Subtropical and Subpolar gyres. |
format |
Article in Journal/Newspaper |
author |
Langehaug, H. Rhines, P. Eldevik, T. Mignot, J. Lohmann, K. |
spellingShingle |
Langehaug, H. Rhines, P. Eldevik, T. Mignot, J. Lohmann, K. Water mass transformation and the North Atlantic Current in three multicentury climate model simulations |
author_facet |
Langehaug, H. Rhines, P. Eldevik, T. Mignot, J. Lohmann, K. |
author_sort |
Langehaug, H. |
title |
Water mass transformation and the North Atlantic Current in three multicentury climate model simulations |
title_short |
Water mass transformation and the North Atlantic Current in three multicentury climate model simulations |
title_full |
Water mass transformation and the North Atlantic Current in three multicentury climate model simulations |
title_fullStr |
Water mass transformation and the North Atlantic Current in three multicentury climate model simulations |
title_full_unstemmed |
Water mass transformation and the North Atlantic Current in three multicentury climate model simulations |
title_sort |
water mass transformation and the north atlantic current in three multicentury climate model simulations |
publishDate |
2012 |
url |
http://hdl.handle.net/11858/00-001M-0000-0010-3A67-C http://hdl.handle.net/11858/00-001M-0000-0014-1D2D-2 |
genre |
Labrador Sea north atlantic current North Atlantic Sea ice |
genre_facet |
Labrador Sea north atlantic current North Atlantic Sea ice |
op_source |
Journal of Geophysical Research-Oceans |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2012JC008021 http://hdl.handle.net/11858/00-001M-0000-0010-3A67-C http://hdl.handle.net/11858/00-001M-0000-0014-1D2D-2 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2012JC008021 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
117 |
container_issue |
C11 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1810455302121717760 |