@article{PAR00016893,
  title = {{I}nvestigation of the intra-annual variability of the {N}orth {E}quatorial {C}ountercurrent/{N}orth {B}razil {C}urrent eddies and of the instability waves of the {N}orth {T}ropical {A}tlantic {O}cean using satellite altimetry and empirical mode decomposition},
  author = {{M}{\'e}lice, {J}ean-{L}uc and {A}rnault, {S}abine},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he intra-annual variability of the tropical {A}tlantic {O}cean north of the equator is investigated with satellite altimetry mean sea level anomaly data and with an algorithm based on empirical mode decomposition ({EMD}) methods. {T}wo regions of high variability are identified. {T}he first region, between 3 degrees and 12 degrees {N}, is characterized by the presence of westward-propagating eddies linked to the {N}orth {B}razil {C}urrent ({NBC}) retroflection in the vicinity of the {B}razilian coast. {T}hey show a strong annual cycle. {I}n this paper the {EMD} algorithm points out that this signal is frequency modulated shifting from large length-scale structures in {O}ctober to smaller ones in {M}arch. {C}onsequently, the number of "eddies' per year can be aliased, according to the time and location of sampling, and can impact the percentage they explain of the interhemispheric exchange of mass and heat associated with the meridional overturning circulation's upper limb. {A} scenario concerning this dynamics is proposed. {T}he second region reveals the presence of westward-propagating instability waves centered north of the equator (3 degrees-7 degrees {N}) between 50 degrees and 10 degrees {W}. {T}hese instability waves are also frequency modulated and show a strong seasonal cycle with maximum amplitude around {A}ugust.},
  keywords = {{ATLANTIQUE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{J}ournal of {A}tmospheric and {O}ceanic {T}echnology},
  volume = {34},
  numero = {10},
  pages = {2295--2310},
  ISSN = {0739-0572},
  year = {2017},
  DOI = {10.1175/jtech-d-17-0032.1},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00016893},
}