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Water mass analysis along 22 °N in the subtropical North Atlantic for the JC150 cruise (GEOTRACES, GApr08)

Water mass analysis along 22 °N in the subtropical North Atlantic for the JC150 cruise (GEOTRACES, GApr08)
Water mass analysis along 22 °N in the subtropical North Atlantic for the JC150 cruise (GEOTRACES, GApr08)
This study presents a water mass analysis along the JC150 section in the subtropical North Atlantic, based on hydrographic and nutrient data, by combining an extended optimum multiparameter analysis (OMPA) with a Lagrangian particle tracking experiment (LPTE). This combination, which was proposed for the first time, aided in better constraining the OMPA end-member choice and providing information about their trajectories. It also enabled tracing the water mass origins in surface layers, which cannot be achieved with an OMPA. The surface layers were occupied by a shallow type of Eastern South Atlantic Central Water (ESACW) with traces of the Amazon plume in the west. Western North Atlantic Central Water dominates from 100 to 500 m, while the 13 °C-ESACW contribution occurs marginally deeper (500–900 m). At approximately 700 m, Antarctic Intermediate Water (AAIW) dominates the west of the Mid-Atlantic Ridge (MAR), while Mediterranean Water dominates the east with a small but non-negligible contribution down to 3500 m. Below AAIW, Upper Circumpolar Deep Water (UCDW) is observed throughout section (900–1250 m). Labrador Sea Water (LSW) is found centered at 1500 m, where the LPTE highlights an eastern LSW route from the eastern North Atlantic to the eastern subtropical Atlantic, which was not previously reported. North East Atlantic Deep Water (encompassing a contribution of Iceland-Scotland Overflow Water) is centered at ~2500 m, while North West Atlantic Bottom Water (NWABW, encompassing a contribution of Denmark Strait Overflow Water) is principally localized in the west of the MAR in the range of 3500–5000 m. NWABW is also present in significant proportions (>25%) in the east of the MAR, suggesting a crossing of the MAR possibly through the Kane fracture zone. This feature has not been investigated so far. Finally, Antarctic Bottom Water is present in deep waters throughout the section, mainly in the west of the MAR. Source waters have been characterized from GEOTRACES sections, which enables estimations of trace elements and isotope transport within water masses in the subtropical North Atlantic.
GEOTRACES, JC150, Lagrangian particle tracking experiment, Optimum multiparameter analysis (OMPA), Subtropical north Atlantic, Water mass
0967-0637
Artigue, Lise
8dfc3629-ad86-49de-a233-2ba6319d9c78
Lacan, François
5d9279cd-dd40-43c2-83c9-ce0704672a55
Van Gennip, Simon
e87826a9-f6d2-4fc1-a1bb-52e8dd8e6712
Lohan, Maeve C.
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Wyatt, Neil J.
258d214b-9dae-4a5f-acc9-c0a55fb66efd
Woodward, E. Malcolm S.
3a11b7bf-b110-448a-b1ee-ae1ce7d0fef5
Mahaffey, Claire
6c868a01-2c9b-48b0-ae08-9ecf6b870032
Hopkins, Joanne
e9814234-cbed-40f9-8e95-812d4b6ffd6a
Drillet, Yann
55e91cbb-e849-49ea-a9f4-5da96a198d36
Artigue, Lise
8dfc3629-ad86-49de-a233-2ba6319d9c78
Lacan, François
5d9279cd-dd40-43c2-83c9-ce0704672a55
Van Gennip, Simon
e87826a9-f6d2-4fc1-a1bb-52e8dd8e6712
Lohan, Maeve C.
6ca10597-2d0f-40e8-8e4f-7619dfac5088
Wyatt, Neil J.
258d214b-9dae-4a5f-acc9-c0a55fb66efd
Woodward, E. Malcolm S.
3a11b7bf-b110-448a-b1ee-ae1ce7d0fef5
Mahaffey, Claire
6c868a01-2c9b-48b0-ae08-9ecf6b870032
Hopkins, Joanne
e9814234-cbed-40f9-8e95-812d4b6ffd6a
Drillet, Yann
55e91cbb-e849-49ea-a9f4-5da96a198d36

Artigue, Lise, Lacan, François, Van Gennip, Simon, Lohan, Maeve C., Wyatt, Neil J., Woodward, E. Malcolm S., Mahaffey, Claire, Hopkins, Joanne and Drillet, Yann (2020) Water mass analysis along 22 °N in the subtropical North Atlantic for the JC150 cruise (GEOTRACES, GApr08). Deep Sea Research Part I: Oceanographic Research Papers, 158, [103230]. (doi:10.1016/j.dsr.2020.103230).

Record type: Article

Abstract

This study presents a water mass analysis along the JC150 section in the subtropical North Atlantic, based on hydrographic and nutrient data, by combining an extended optimum multiparameter analysis (OMPA) with a Lagrangian particle tracking experiment (LPTE). This combination, which was proposed for the first time, aided in better constraining the OMPA end-member choice and providing information about their trajectories. It also enabled tracing the water mass origins in surface layers, which cannot be achieved with an OMPA. The surface layers were occupied by a shallow type of Eastern South Atlantic Central Water (ESACW) with traces of the Amazon plume in the west. Western North Atlantic Central Water dominates from 100 to 500 m, while the 13 °C-ESACW contribution occurs marginally deeper (500–900 m). At approximately 700 m, Antarctic Intermediate Water (AAIW) dominates the west of the Mid-Atlantic Ridge (MAR), while Mediterranean Water dominates the east with a small but non-negligible contribution down to 3500 m. Below AAIW, Upper Circumpolar Deep Water (UCDW) is observed throughout section (900–1250 m). Labrador Sea Water (LSW) is found centered at 1500 m, where the LPTE highlights an eastern LSW route from the eastern North Atlantic to the eastern subtropical Atlantic, which was not previously reported. North East Atlantic Deep Water (encompassing a contribution of Iceland-Scotland Overflow Water) is centered at ~2500 m, while North West Atlantic Bottom Water (NWABW, encompassing a contribution of Denmark Strait Overflow Water) is principally localized in the west of the MAR in the range of 3500–5000 m. NWABW is also present in significant proportions (>25%) in the east of the MAR, suggesting a crossing of the MAR possibly through the Kane fracture zone. This feature has not been investigated so far. Finally, Antarctic Bottom Water is present in deep waters throughout the section, mainly in the west of the MAR. Source waters have been characterized from GEOTRACES sections, which enables estimations of trace elements and isotope transport within water masses in the subtropical North Atlantic.

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Accepted/In Press date: 27 January 2020
e-pub ahead of print date: 30 January 2020
Published date: April 2020
Additional Information: Funding Information: French Ministry of Higher Education, Research and Innovation (MESRI) public funding awarded to Lise Artigue (University of Toulouse). Funding Information: French National Centre for Scientific Research (CNRS) public funding awarded to François Lacan (LEGOS). Publisher Copyright: © 2020 Elsevier Ltd
Keywords: GEOTRACES, JC150, Lagrangian particle tracking experiment, Optimum multiparameter analysis (OMPA), Subtropical north Atlantic, Water mass

Identifiers

Local EPrints ID: 438740
URI: http://eprints.soton.ac.uk/id/eprint/438740
ISSN: 0967-0637
PURE UUID: 0186a2e9-3ecb-4390-94dd-87b51c7c7912
ORCID for Maeve C. Lohan: ORCID iD orcid.org/0000-0002-5340-3108
ORCID for Neil J. Wyatt: ORCID iD orcid.org/0000-0002-1080-7778

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Date deposited: 23 Mar 2020 18:02
Last modified: 16 Sep 2022 04:01

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Contributors

Author: Lise Artigue
Author: François Lacan
Author: Simon Van Gennip
Author: Maeve C. Lohan ORCID iD
Author: Neil J. Wyatt ORCID iD
Author: E. Malcolm S. Woodward
Author: Claire Mahaffey
Author: Joanne Hopkins
Author: Yann Drillet

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