Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing
Deep-water formation in the eastern Subpolar North Atlantic Ocean (eSPNA) and Nordic Seas is crucial for maintaining the lower limb of the Atlantic Meridional Overturning Circulation (AMOC), of consequence for global climate. However, it is still uncertain which processes determine the deep-water fo...
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ftnerc:oai:nora.nerc.ac.uk:537958 2024-09-15T17:51:17+00:00 Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing Dey, Dipanjan Marsh, Robert Drijfhout, Sybren Josey, Simon A. Sinha, Bablu Grist, Jeremy Döös, Kristofer 2024-08-26 text http://nora.nerc.ac.uk/id/eprint/537958/ https://nora.nerc.ac.uk/id/eprint/537958/1/s41467-024-51777-w.pdf https://doi.org/10.1038/s41467-024-51777-w en eng https://nora.nerc.ac.uk/id/eprint/537958/1/s41467-024-51777-w.pdf Dey, Dipanjan; Marsh, Robert; Drijfhout, Sybren; Josey, Simon A. orcid:0000-0002-1683-8831 Sinha, Bablu; Grist, Jeremy orcid:0000-0003-1068-9211 Döös, Kristofer. 2024 Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing. Nature Communications, 15 (1). https://doi.org/10.1038/s41467-024-51777-w <https://doi.org/10.1038/s41467-024-51777-w> cc_by_4 Publication - Article PeerReviewed 2024 ftnerc https://doi.org/10.1038/s41467-024-51777-w 2024-09-03T23:47:14Z Deep-water formation in the eastern Subpolar North Atlantic Ocean (eSPNA) and Nordic Seas is crucial for maintaining the lower limb of the Atlantic Meridional Overturning Circulation (AMOC), of consequence for global climate. However, it is still uncertain which processes determine the deep-water formation and how much Atlantic and Arctic waters respectively contribute to the lower limb. To address this, here we used Lagrangian trajectories to diagnose a global eddy-resolving ocean model that agrees well with recent observations highlighting the eSPNA as a primary source of the AMOC lower limb. Comprised of 72% Atlantic waters and 28% Arctic waters, the density and depth of the AMOC lower limb is critically dependent on Atlantic-Arctic mixing, primarily in the vicinity of Denmark Strait. In contrast, Atlantic waters gaining density through air-sea interaction along the eastern periphery of Nordic Seas and not entering the Arctic Ocean make a negligible contribution to the lower limb. Article in Journal/Newspaper Arctic Arctic Ocean Atlantic Arctic Atlantic-Arctic Denmark Strait Nordic Seas North Atlantic Natural Environment Research Council: NERC Open Research Archive Nature Communications 15 1 |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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English |
description |
Deep-water formation in the eastern Subpolar North Atlantic Ocean (eSPNA) and Nordic Seas is crucial for maintaining the lower limb of the Atlantic Meridional Overturning Circulation (AMOC), of consequence for global climate. However, it is still uncertain which processes determine the deep-water formation and how much Atlantic and Arctic waters respectively contribute to the lower limb. To address this, here we used Lagrangian trajectories to diagnose a global eddy-resolving ocean model that agrees well with recent observations highlighting the eSPNA as a primary source of the AMOC lower limb. Comprised of 72% Atlantic waters and 28% Arctic waters, the density and depth of the AMOC lower limb is critically dependent on Atlantic-Arctic mixing, primarily in the vicinity of Denmark Strait. In contrast, Atlantic waters gaining density through air-sea interaction along the eastern periphery of Nordic Seas and not entering the Arctic Ocean make a negligible contribution to the lower limb. |
format |
Article in Journal/Newspaper |
author |
Dey, Dipanjan Marsh, Robert Drijfhout, Sybren Josey, Simon A. Sinha, Bablu Grist, Jeremy Döös, Kristofer |
spellingShingle |
Dey, Dipanjan Marsh, Robert Drijfhout, Sybren Josey, Simon A. Sinha, Bablu Grist, Jeremy Döös, Kristofer Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing |
author_facet |
Dey, Dipanjan Marsh, Robert Drijfhout, Sybren Josey, Simon A. Sinha, Bablu Grist, Jeremy Döös, Kristofer |
author_sort |
Dey, Dipanjan |
title |
Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing |
title_short |
Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing |
title_full |
Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing |
title_fullStr |
Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing |
title_full_unstemmed |
Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing |
title_sort |
formation of the atlantic meridional overturning circulation lower limb is critically dependent on atlantic-arctic mixing |
publishDate |
2024 |
url |
http://nora.nerc.ac.uk/id/eprint/537958/ https://nora.nerc.ac.uk/id/eprint/537958/1/s41467-024-51777-w.pdf https://doi.org/10.1038/s41467-024-51777-w |
genre |
Arctic Arctic Ocean Atlantic Arctic Atlantic-Arctic Denmark Strait Nordic Seas North Atlantic |
genre_facet |
Arctic Arctic Ocean Atlantic Arctic Atlantic-Arctic Denmark Strait Nordic Seas North Atlantic |
op_relation |
https://nora.nerc.ac.uk/id/eprint/537958/1/s41467-024-51777-w.pdf Dey, Dipanjan; Marsh, Robert; Drijfhout, Sybren; Josey, Simon A. orcid:0000-0002-1683-8831 Sinha, Bablu; Grist, Jeremy orcid:0000-0003-1068-9211 Döös, Kristofer. 2024 Formation of the Atlantic Meridional Overturning Circulation lower limb is critically dependent on Atlantic-Arctic mixing. Nature Communications, 15 (1). https://doi.org/10.1038/s41467-024-51777-w <https://doi.org/10.1038/s41467-024-51777-w> |
op_rights |
cc_by_4 |
op_doi |
https://doi.org/10.1038/s41467-024-51777-w |
container_title |
Nature Communications |
container_volume |
15 |
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1 |
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1810293141123629056 |