@article{fdi:010083085,
  title = {{A}dvective transport caused by intraseasonal {R}ossby waves : {A} key player of the high chlorophyll variability off the {P}eru upwelling region - art. no. {C}09018},
  author = {{B}onhomme, {C}{\'e}line and {A}umont, {O}livier and {E}chevin, {V}incent},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he upwelling region off {P}eru between 5 degrees {S} and 12 degrees {S} is characterized by high offshore intraseasonal variability in sea-surface productivity due to westward propagating chlorophyll anomalies, whose magnitude can reach half the variance of total chlorophyll variations. {S}pectral analyses of {SSH}, {SST} and chlorophyll satellite data show that these events are generated by intraseasonal {R}ossby waves. {T}he almost constant phase shift between chlorophyll and altimetric signals suggests a physical mechanism dominated by horizontal advection, which is confirmed by the use of a simple conceptual model. {F}urthermore, an increase from the north to the south in the detected {R}ossby wave periods, correlated with a decrease in the wavelengths and phase velocities of the wave, suggests the presence of a second baroclinic mode north of 8 degrees {S} and of a first baroclinic mode south of this latitude. {T}he latitude of this transition is consistent with the theory of critical latitudes, which specifies that at a given latitude, only {R}ossby wave with periods below a threshold period, depending on the baroclinic structure of the wave, can propagate offshore. {A}ccording to this theory, second baroclinic mode {R}ossby waves with periods greater than 130 days are supposed to propagate off the {S}outh {A}merican coast north of 8 degrees {S}, the corresponding critical latitude.},
  keywords = {{PEROU} ; {PACIFIQUE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch {O}ceans},
  volume = {112},
  numero = {{C}9},
  pages = {{C}09018 [13 ]},
  ISSN = {0148-0227},
  year = {2007},
  DOI = {10.1029/2006{JC}004022},
  URL = {https://www.documentation.ird.fr/hor/fdi:010083085},
}