@article{fdi:010080584,
  title = {{N}ear-surface western boundary circulation off {N}ortheast {B}razil},
  author = {{D}ossa, {A}. {N}. and {S}ilva, {A}. {C}. and {C}haigneau, {A}lexis and {E}ldin, {G}{\'e}rard and {A}raujo, {M}. and {B}ertrand, {A}rnaud},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n the tropical {A}tlantic {O}cean, the {N}orth {B}razil {U}ndercurrent ({NBUC}) and the {N}orth {B}razil {C}urrent ({NBC}) play important roles as near-surface northward paths for the {A}tlantic meridional overturning circulation. {T}o investigate the meridional evolution of the near-surface western boundary circulation in that region, two surveys were carried out off {N}ortheast {B}razil during austral spring 2015 and fall 2017, periods that we show to be representative of typical conditions for the spring and fall seasons. {U}sing conductivity temperature depth oxygen probe and ship-mounted acoustic {D}oppler current profiler measurements, altimetry data, and numerical reanalysis products, we examine the spatiotemporal variability of the {NBUC}, providing a comprehensive view of the circulation, including {NBUC}-{NBC} transition and the potential impact of mesoscale eddies. {T}he {NBUC} originating south of 10 degrees {S} flows equatorward over the continental slope. {NBUC} mean velocity, transport and vertical extent of the velocity core were higher in spring 2015 (0.81 m s(-1), 15.6 {S}v, and >400 m) than in fall 2017 (0.65 m s(-1), 11.0 {S}v, and similar to 300 m). {T}he upper limit of the {NBUC} velocity core rose slightly from 160 m at 9 degrees {S} to 105 m depth at 6 degrees {S}. {T}his pattern is associated with a northward increase in current velocity from 0.7 m s(-1) at 9 degrees {S} to 1 m s(-1) at 5 degrees {S}. {T}he orographic effect shifts the flow from northeastward south of 7.5 degrees {S} to northwestward north of 7.5 degrees {S}, following the shoreline. {B}esides, altimetry data show that this flow can be locally influenced by mesoscale activity. {F}arther north, at similar to 4.8 degrees {S}, data obtained in fall 2017 show that the central branch of the {S}outh {E}quatorial {C}urrent (c{SEC}) enters into the western boundary system where it coalesces with the {NBUC} to form the {NBC}, flowing toward the {C}aribbean {S}ea. {F}inally, in fall, the {NBUC} retroflection does not feed the {S}outh {E}quatorial {U}ndercurrent ({SEUC}), which, instead originates from retroflections of the c{SEC} and the equatorial branch of the {S}outh {E}quatorial {C}urrent (e{SEC}).},
  keywords = {{W}estern {T}ropical {A}tlantic ; {N}orth {B}razil {U}ndercurrent ; {N}orth {B}razil {C}urrent ; {F}low-topography interaction ; {M}esoscale activity ; {ADCP} ; {BRESIL} ; {ATLANTIQUE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{P}rogress in {O}ceanography},
  volume = {190},
  numero = {},
  pages = {102475 [15 ]},
  ISSN = {0079-6611},
  year = {2021},
  DOI = {10.1016/j.pocean.2020.102475},
  URL = {https://www.documentation.ird.fr/hor/fdi:010080584},
}