@article{fdi:010080564,
  title = {{I}ntra- and inter-annual variability of {N}orth {B}razil {C}urrent rings using angular momentum eddy detection and tracking algorithm : observations from 1993 to 2016},
  author = {{A}roucha, {L}. {C}. and {V}eleda, {D}. and {L}opes, {F}. {S}. and {T}yaquica, {P}. and {L}ef{\`e}vre, {N}athalie and {A}raujo, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n order to investigate intra- and inter-annual variability of {N}orth {B}razil {C}urrent ({NBC}) rings, angular momentum eddy detection and tracking algorithm ({AMEDA}) was used for identification of their occurrence, trajectories, and parameters. {B}ased on 24 years (1993-2016) of geopotential height and geostrophic current fields reanalysis data from {ARMOR} 3{D} (1/4 degrees), we identified an average rate of five {NBC} rings shed by year. {T}he rings present an average lifetime of 15.3 (+/- 5.4) weeks, average speed-based radius ({R}-max) of 139.8 (+/- 23.6) km, and mean sea surface height anomaly ({SSH}a) of 9.4 (+/- 4.0) cm. {T}he mean observed maximum azimuthal velocity ({V}-max) was 0.27 (+/- 0.08) m/s, while the averaged {R}ossby number ({R}o) value was 0.08 (+/- 0.04) and averaged kinetic energy ({KE}) was of 255.3 (+/- 154.8) cm(2)/s(2). {NBC} rings have larger dimensions, rotate faster, live less, and transfer more energy in boreal winter months. {I}n contrast, those shed during boreal summer and early fall last longer, have smaller diameters and carry less energy. {B}esides, the analysis of ring merging pointed that the interaction between {NBC} rings generated a significantly increase in ring energy (52%), and velocity (22%). {F}inally, we observed the vertical anomalies temperature and salinity profiles, which indicated a thermocline deepening and sinking of coastal and tropical waters due to {NBC} rings downwelling. {T}his study emphasizes the robustness and efficiency of {AMEDA} for studying rings in the ocean and further theorizes possible impacts of {NBC} ring on ocean physical and biogeochemical features in the {W}estern {T}ropical {N}orth {A}tlantic.},
  keywords = {{NBC} {R}ings ; {T}ropical {A}tlantic ; {AMEDA} algorithm ; {O}cean eddies ; {BRESIL} ; {ATLANTIQUE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {O}ceans},
  volume = {125},
  numero = {12},
  pages = {e2019{JC}015921 [13 ]},
  ISSN = {2169-9275},
  year = {2020},
  DOI = {10.1029/2019jc015921},
  URL = {https://www.documentation.ird.fr/hor/fdi:010080564},
}