@article{fdi:010049181,
  title = {{E}ddy activity in the four major upwelling systems from satellite altimetry (1992-2007)},
  author = {{C}haigneau, {A}lexis and {E}ldin, {G}{\'e}rard and {D}ewitte, {B}oris},
  editor = {},
  language = {{ENG}},
  abstract = {{E}ddy activity in the four major eastern boundary upwelling systems ({EBUS}) is investigated using 15 years of satellite altimetry data. {B}ased on the analysis of more than 4000 long-lived eddy trajectories in every {EBUS}, we show that mesoscale structures are mainly generated along the continental coasts and south of the main archipelagos and propagate westward with velocities increasing toward the equator. {T}hese mesoscale eddies, having radii of 70-160 km, are then frequently observed along the coastal transition zones and frontal regions and some large oceanic areas are preferentially populated by cyclonic or anticyclonic eddies. {T}emporal variations of the number of newly-formed eddies and the associated eddy activity index, defined as the mean eddy energy density, are finally examined at seasonal and interannual scales. {T}he strongest seasonal (interannual, respectively) variations are observed in the {C}alifornia ({B}enguela) upwelling systems. {T}he proposed indices also exhibit contrasted long-term trends in each {EBUS}, which suggests that eddy activity might be sensitive to a warming climate.},
  keywords = {},
  booktitle = {},
  journal = {{P}rogress in {O}ceanography},
  volume = {83},
  numero = {1-4},
  pages = {117--123},
  ISSN = {0079-6611},
  year = {2009},
  DOI = {10.1016/j.pocean.2009.07.012},
  URL = {https://www.documentation.ird.fr/hor/fdi:010049181},
}