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Differences between 1999 and 2010 across the Falkland Plateau: fronts and water masses

Differences between 1999 and 2010 across the Falkland Plateau: fronts and water masses
Differences between 1999 and 2010 across the Falkland Plateau: fronts and water masses
Decadal differences in the Falkland Plateau are studied from the two full-depth hydrographic data collected during the ALBATROSS (April 1999) and MOC-Austral (February 2010) cruises. Differences in the upper 100 dbar are due to changes in the seasonal thermocline, as the ALBATROSS cruise took place in the austral fall and the MOC-Austral cruise in summer. The intermediate water masses seem to be very sensitive to the wind conditions existing in their formation area, showing cooling and freshening for the decade as a consequence of a higher Antarctic Intermediate Water (AAIW) contribution and of a decrease in the Subantarctic Mode Water (SAMW) stratum. The deeper layers do not exhibit any significant change in the water mass properties. The Subantarctic Front (SAF) in 1999 is observed at 52.2–54.8° W with a relative mass transport of 32.6 Sv. In contrast, the SAF gets wider in 2010, stretching from 51.1 to 57.2° W (the Falkland Islands), and weakening to 17.9 Sv. Changes in the SAF can be linked with the westerly winds and mainly affect the northward flow of Subantarctic Surface Water (SASW), SAMW and AAIW/Antarctic Surface Water (AASW). The Polar Front (PF) carries 24.9 Sv in 1999 (49.8–44.4° W), while in 2010 (49.9–49.2° W) it narrows and strengthens to 37.3 Sv.
1812-0792
577-587
Pérez-Hernández, M. Dolores
022fdd22-6409-4a49-90a1-b5430c3ace8d
Hernández-Guerra, Alonso
09fa215a-646f-4e71-8473-0657a4531d67
Comas-Rodríguez, Isis
e6a55fda-29aa-42d4-a760-530543235f1f
Benítez-Barrios, Verónica M.
eeccb60b-d621-42b6-990e-7330f934a088
Fraile-Nuez, Eugenio
8d9da1ce-18ba-429c-8995-991f45512f7f
Pelegrí, Josep L.
1b05a0a5-cbd9-4f59-b183-f4a64b61f86d
Naveira Garabato, Alberto C.
97c0e923-f076-4b38-b89b-938e11cea7a6
Pérez-Hernández, M. Dolores
022fdd22-6409-4a49-90a1-b5430c3ace8d
Hernández-Guerra, Alonso
09fa215a-646f-4e71-8473-0657a4531d67
Comas-Rodríguez, Isis
e6a55fda-29aa-42d4-a760-530543235f1f
Benítez-Barrios, Verónica M.
eeccb60b-d621-42b6-990e-7330f934a088
Fraile-Nuez, Eugenio
8d9da1ce-18ba-429c-8995-991f45512f7f
Pelegrí, Josep L.
1b05a0a5-cbd9-4f59-b183-f4a64b61f86d
Naveira Garabato, Alberto C.
97c0e923-f076-4b38-b89b-938e11cea7a6

Pérez-Hernández, M. Dolores, Hernández-Guerra, Alonso, Comas-Rodríguez, Isis, Benítez-Barrios, Verónica M., Fraile-Nuez, Eugenio, Pelegrí, Josep L. and Naveira Garabato, Alberto C. (2017) Differences between 1999 and 2010 across the Falkland Plateau: fronts and water masses. Ocean Science, 13 (4), 577-587. (doi:10.5194/os-13-577-2017).

Record type: Article

Abstract

Decadal differences in the Falkland Plateau are studied from the two full-depth hydrographic data collected during the ALBATROSS (April 1999) and MOC-Austral (February 2010) cruises. Differences in the upper 100 dbar are due to changes in the seasonal thermocline, as the ALBATROSS cruise took place in the austral fall and the MOC-Austral cruise in summer. The intermediate water masses seem to be very sensitive to the wind conditions existing in their formation area, showing cooling and freshening for the decade as a consequence of a higher Antarctic Intermediate Water (AAIW) contribution and of a decrease in the Subantarctic Mode Water (SAMW) stratum. The deeper layers do not exhibit any significant change in the water mass properties. The Subantarctic Front (SAF) in 1999 is observed at 52.2–54.8° W with a relative mass transport of 32.6 Sv. In contrast, the SAF gets wider in 2010, stretching from 51.1 to 57.2° W (the Falkland Islands), and weakening to 17.9 Sv. Changes in the SAF can be linked with the westerly winds and mainly affect the northward flow of Subantarctic Surface Water (SASW), SAMW and AAIW/Antarctic Surface Water (AASW). The Polar Front (PF) carries 24.9 Sv in 1999 (49.8–44.4° W), while in 2010 (49.9–49.2° W) it narrows and strengthens to 37.3 Sv.

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Accepted/In Press date: 7 June 2017
e-pub ahead of print date: 7 July 2017

Identifiers

Local EPrints ID: 413245
URI: http://eprints.soton.ac.uk/id/eprint/413245
ISSN: 1812-0792
PURE UUID: 77603121-818a-4938-9133-fa32b04d6c1d

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Date deposited: 18 Aug 2017 16:31
Last modified: 06 Oct 2020 19:40

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