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Ocean Dynamics

, Volume 68, Issue 7, pp 761–777 | Cite as

Eddy properties in the Southern California Current System

  • Fanny Chenillat
  • Peter J. S. Franks
  • Xavier Capet
  • Pascal Rivière
  • Nicolas Grima
  • Bruno Blanke
  • Vincent Combes
Article

Abstract

The California Current System (CCS) is an eastern boundary upwelling system characterized by strong eddies that are often generated at the coast. These eddies contribute to intense, long-distance cross-shelf transport of upwelled water with enhanced biological activity. However, the mechanisms of formation of such coastal eddies, and more importantly their capacity to trap and transport tracers, are poorly understood. Their unpredictability and strong dynamics leave us with an incomplete picture of the physical and biological processes at work, their effects on coastal export, lateral water exchange among eddies and their surrounding waters, and how long and how far these eddies remain coherent structures. Focusing our analysis on the southern part of the CCS, we find a predominance of cyclonic eddies, with a 25-km radius and a SSH amplitude of 6 cm. They are formed near shore and travel slightly northwest offshore for ~ 190 days at ~ 2 km day−1. We then study one particular, representative cyclonic eddy using a combined Lagrangian and Eulerian numerical approach to characterize its kinematics. Formed near shore, this eddy trapped a core made up of ~ 67% California Current waters and ~ 33% California Undercurrent waters. This core was surrounded by other waters while the eddy detached from the coast, leaving the oldest waters at the eddy’s core and the younger waters toward the edge. The eddy traveled several months as a coherent structure, with only limited lateral exchange within the eddy.

Keywords

California upwelling system Mesoscale eddies Eddy dynamics Lagrangian study Numerical study 

Notes

Acknowledgments

This work was supported by the California Current Ecosystem LTER site (NSF Award No. 1026607). FC thanks Mati Kahru (Scripps Institution of Oceanography, UCSD—mkahru@ucsd.edu) for providing satellite data. We thank the two anonymous referees for their insightful comment on the manuscript. The altimeter products were produced by Ssalto/Duacs and distributed by Aviso, with support from CNES (http://www.aviso.oceanobs.com/duac). The data used as boundaries and surface forcing for the model study are available from the Comprehensive Ocean-Atmosphere Data Set (COADS) (http://iridl.ldeo.columbia.edu/SOURCES/.COADS/), Advanced Very High Resolution Radiometer (AVHRR) (http://noaasis.noaa.gov/NOAASIS/ml/avhrr.html), from Quick Scatterometer (QuikScat) (http://www.remss.com/missions/qscat), and Ocean General Circulation Model for the Earth Simulator (OFES) (http://www.jamstec.go.jp/esc/research/AtmOcn/product/ofes.html). All the numerical runs were performed with the Caparmor high-performance computer facilities available at Ifremer. The numerical dataset that supports this article is available upon request to the authors.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Integrative Oceanography Division, Scripps Institution of OceanographyUniversity of California San DiegoLa JollaUSA
  2. 2.Laboratoire des Sciences de l’Environnement Marin (LEMAR), UMR 6539 CNRS-Ifremer-IRD-UBOInstitut Universitaire Européen de la Mer (IUEM)PlouzanéFrance
  3. 3.Laboratoire d’Océanographie et du Climat (LOCEAN), CNRS-UPMC-IRD-MNHNInstitut Pierre Simon Laplace (IPSL)ParisFrance
  4. 4.Laboratoire d’Océanographie Physique et Spatiale (LOPS), UMR 6523 CNRS-Ifremer-IRD-UBOIUEMPlouzanéFrance
  5. 5.College of Earth, Ocean and Atmospheric SciencesOregon State UniversityCorvallisUSA

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