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Portela E., Kolodziejczyk N., Maes Christophe, Thierry V. (2020). Interior water-mass variability in the southern hemisphere oceans during the last decade. Journal of Physical Oceanography, 50 (2), 361-381. ISSN 0022-3670

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Lien direct chez l'éditeur doi:10.1175/jpo-d-19-0128.1

Titre
Interior water-mass variability in the southern hemisphere oceans during the last decade
Année de publication2020
Type de documentArticle référencé dans le Web of Science WOS:000510891200001
AuteursPortela E., Kolodziejczyk N., Maes Christophe, Thierry V.
SourceJournal of Physical Oceanography, 2020, 50 (2), p. 361-381. ISSN 0022-3670
RésuméUsing an Argo dataset and the ECCOv4 reanalysis, a volume budget was performed to address the main mechanisms driving the volume change of the interior water masses in the Southern Hemisphere oceans between 2006 and 2015. The subduction rates and the isopycnal and diapycnal water-mass transformation were estimated in a density-spiciness (sigma-tau) framework. Spiciness, defined as thermohaline variations along isopycnals, was added to the potential density coordinates to discriminate between water masses spreading on isopycnal layers. The main positive volume trends were found to be associated with the Subantarctic Mode Waters (SAMW) in the South Pacific and South Indian Ocean basins, revealing a lightening of the upper waters in the Southern Hemisphere. The SAMW exhibits a two-layer density structure in which subduction and diapycnal transformation from the lower to the upper layers accounted for most of the upper-layer volume gain and lower-layer volume loss, respectively. The Antarctic Intermediate Waters, defined here between the 27.2 and 27.5 kg m(-3) isopycnals, showed the strongest negative volume trends. This volume loss can be explained by their negative isopyncal transformation southward of the Antarctic Circumpolar Current into the fresher and colder Antarctic Winter Waters (AAWW) and northward into spicier tropical/subtropical Intermediate Waters. The AAWW is destroyed by obduction back into the mixed layer so that its net volume change remains nearly zero. The proposed mechanisms to explain the transformation within the Intermediate Waters are discussed in the context of Southern Ocean dynamics. The sigma-tau decomposition provided new insight on the spatial and temporal water-mass variability and driving mechanisms over the last decade.
Plan de classementLimnologie physique / Océanographie physique [032]
Descr. géo.PACIFIQUE SUD ; OCEAN INDIEN ; ATLANTIQUE SUD
LocalisationFonds IRD [F B010077860]
Identifiant IRDfdi:010077860
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010077860

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