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Pegliasco C., Chaigneau Alexis, Morrow R. (2015). Main eddy vertical structures observed in the four major Eastern Boundary Upwelling Systems. Journal of Geophysical Research. Oceans, 120 (9), 6008-6033. ISSN 2169-9275

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Lien direct chez l'éditeur doi:10.1002/2015jc010950

Titre
Main eddy vertical structures observed in the four major Eastern Boundary Upwelling Systems
Année de publication2015
Type de documentArticle référencé dans le Web of Science WOS:000363470300008
AuteursPegliasco C., Chaigneau Alexis, Morrow R.
SourceJournal of Geophysical Research. Oceans, 2015, 120 (9), p. 6008-6033. ISSN 2169-9275
RésuméIn the four major Eastern Boundary Upwelling Systems (EBUS), mesoscale eddies are known to modulate the biological productivity and transport near-coastal seawater properties toward the offshore ocean, however little is known about their main characteristics and vertical structure. This study combines 10 years of satellite-altimetry data and Argo float profiles of temperature and salinity, and our main goals are (i) to describe the main surface characteristics of long-lived eddies formed in each EBUS and their evolution, and (ii) to depict the main vertical structure of the eddy-types that coexist in these regions. A clustering analysis of the Argo profiles surfacing within the long-lived eddies of each EBUS allows us to determine the proportion of surface and subsurface-intensified eddies in each region, and to describe their vertical structure in terms of temperature, salinity and dynamic height anomalies. In the Peru-Chile Upwelling System, 55% of the sampled anticyclonic eddies (AEs) have subsurface-intensified maximum temperature and salinity anomalies below the seasonal pycnocline, whereas 88% of the cyclonic eddies (CEs) are surface-intensified. In the California Upwelling System, only 30% of the AEs are subsurface-intensified and all of the CEs show maximum anomalies above the pycnocline. In the Canary Upwelling System, approximate to 40% of the AEs and approximate to 60% of the CEs are subsurface-intensified with maximum anomalies extending down to 800 m depth. Finally, the Benguela Upwelling System tends to generate approximate to 40-50% of weak surface-intensified eddies and approximate to 50-60% of much stronger subsurface-intensified eddies with a clear geographical distribution. The mechanisms involved in the observed eddy vertical shapes are discussed.
Plan de classementLimnologie physique / Océanographie physique [032]
Descr. géo.PACIFIQUE ; PEROU ; CHILI
LocalisationFonds IRD [F B010065395]
Identifiant IRDfdi:010065395
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010065395

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