Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N
Because new observations have revealed that the Labrador Sea is not the primary source for waters in the lower limb of the Atlantic Meridional Overturning Circulation (AMOC) during the Overturning in the Subpolar North Atlantic Programme (OSNAP) period, it seems timely to re‐examine the traditional...
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American Geophysical Union (AGU)
2023
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Online Access: | https://centaur.reading.ac.uk/113052/ https://centaur.reading.ac.uk/113052/1/Manuscript_NADWorigins_Reviewed_CentAUR.pdf |
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ftunivreading:oai:centaur.reading.ac.uk:113052 2024-05-19T07:42:53+00:00 Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N Petit, T. Lozier, M. S. Rühs, S. Handmann, P. Biastoch, A. 2023-08 text https://centaur.reading.ac.uk/113052/ https://centaur.reading.ac.uk/113052/1/Manuscript_NADWorigins_Reviewed_CentAUR.pdf en eng American Geophysical Union (AGU) https://centaur.reading.ac.uk/113052/1/Manuscript_NADWorigins_Reviewed_CentAUR.pdf Petit, T. <https://centaur.reading.ac.uk/view/creators/90010964.html> orcid:0000-0002-7922-9363 , Lozier, M. S., Rühs, S. orcid:0000-0001-5001-4994 , Handmann, P. orcid:0000-0002-5901-4680 and Biastoch, A. orcid:0000-0003-3946-4390 (2023) Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N. Journal of Geophysical Research: Oceans, 128 (8). e2023JC019726. ISSN 2169-9291 doi: https://doi.org/10.1029/2023jc019726 <https://doi.org/10.1029/2023jc019726> cc_by_4 Article PeerReviewed 2023 ftunivreading https://doi.org/10.1029/2023jc019726 2024-05-01T00:32:29Z Because new observations have revealed that the Labrador Sea is not the primary source for waters in the lower limb of the Atlantic Meridional Overturning Circulation (AMOC) during the Overturning in the Subpolar North Atlantic Programme (OSNAP) period, it seems timely to re‐examine the traditional interpretation of pathways and property variability for the AMOC lower limb from the subpolar gyre to 26.5°N. In order to better understand these connections, Lagrangian experiments were conducted within an eddy‐rich ocean model to track upper North Atlantic Deep Water (uNADW), defined by density, between the OSNAP line and 26.5°N as well as within the Labrador Sea. The experiments reveal that 77% of uNADW at 26.5°N is directly advected from the OSNAP West section along the boundary current and interior pathways west of the Mid‐Atlantic Ridge. More precisely, the Labrador Sea is a main gateway for uNADW sourced from the Irminger Sea, while particles connecting OSNAP East to 26.5°N are exclusively advected from the Iceland Basin and Rockall Trough along the eastern flank of the Mid‐Atlantic Ridge. Although the pathways between OSNAP West and 26.5°N are only associated with a net formation of 1.1 Sv into the uNADW layer, they show large density changes within the layer. Similarly, as the particles transit through the Labrador Sea, they undergo substantial freshening and cooling that contributes to further densification within the uNADW layer. Article in Journal/Newspaper Iceland Labrador Sea North Atlantic Deep Water North Atlantic CentAUR: Central Archive at the University of Reading Journal of Geophysical Research: Oceans 128 8 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
language |
English |
description |
Because new observations have revealed that the Labrador Sea is not the primary source for waters in the lower limb of the Atlantic Meridional Overturning Circulation (AMOC) during the Overturning in the Subpolar North Atlantic Programme (OSNAP) period, it seems timely to re‐examine the traditional interpretation of pathways and property variability for the AMOC lower limb from the subpolar gyre to 26.5°N. In order to better understand these connections, Lagrangian experiments were conducted within an eddy‐rich ocean model to track upper North Atlantic Deep Water (uNADW), defined by density, between the OSNAP line and 26.5°N as well as within the Labrador Sea. The experiments reveal that 77% of uNADW at 26.5°N is directly advected from the OSNAP West section along the boundary current and interior pathways west of the Mid‐Atlantic Ridge. More precisely, the Labrador Sea is a main gateway for uNADW sourced from the Irminger Sea, while particles connecting OSNAP East to 26.5°N are exclusively advected from the Iceland Basin and Rockall Trough along the eastern flank of the Mid‐Atlantic Ridge. Although the pathways between OSNAP West and 26.5°N are only associated with a net formation of 1.1 Sv into the uNADW layer, they show large density changes within the layer. Similarly, as the particles transit through the Labrador Sea, they undergo substantial freshening and cooling that contributes to further densification within the uNADW layer. |
format |
Article in Journal/Newspaper |
author |
Petit, T. Lozier, M. S. Rühs, S. Handmann, P. Biastoch, A. |
spellingShingle |
Petit, T. Lozier, M. S. Rühs, S. Handmann, P. Biastoch, A. Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N |
author_facet |
Petit, T. Lozier, M. S. Rühs, S. Handmann, P. Biastoch, A. |
author_sort |
Petit, T. |
title |
Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N |
title_short |
Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N |
title_full |
Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N |
title_fullStr |
Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N |
title_full_unstemmed |
Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N |
title_sort |
propagation and transformation of upper north atlantic deep water from the subpolar gyre to 26.5°n |
publisher |
American Geophysical Union (AGU) |
publishDate |
2023 |
url |
https://centaur.reading.ac.uk/113052/ https://centaur.reading.ac.uk/113052/1/Manuscript_NADWorigins_Reviewed_CentAUR.pdf |
genre |
Iceland Labrador Sea North Atlantic Deep Water North Atlantic |
genre_facet |
Iceland Labrador Sea North Atlantic Deep Water North Atlantic |
op_relation |
https://centaur.reading.ac.uk/113052/1/Manuscript_NADWorigins_Reviewed_CentAUR.pdf Petit, T. <https://centaur.reading.ac.uk/view/creators/90010964.html> orcid:0000-0002-7922-9363 , Lozier, M. S., Rühs, S. orcid:0000-0001-5001-4994 , Handmann, P. orcid:0000-0002-5901-4680 and Biastoch, A. orcid:0000-0003-3946-4390 (2023) Propagation and transformation of upper North Atlantic deep water from the subpolar gyre to 26.5°N. Journal of Geophysical Research: Oceans, 128 (8). e2023JC019726. ISSN 2169-9291 doi: https://doi.org/10.1029/2023jc019726 <https://doi.org/10.1029/2023jc019726> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1029/2023jc019726 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
128 |
container_issue |
8 |
_version_ |
1799482580070825984 |