@article{fdi:010088248,
  title = {{O}n the interpretation of changes in the subtropical oxygen minimum zone volume off {C}hile during two {L}a {N}ina events (2001 and 2007)},
  author = {{P}izarro-{K}och, {M}. and {P}izarro, {O}. and {D}ewitte, {B}oris and {M}ontes, {I}. and {P}aulmier, {A}ur{\'e}lien and {G}arcon, {V}. and {S}epulveda, {H}. {H}. and {C}orredor-{A}costa, {A}. and {A}guirre, {C}. and {R}amos, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}xygen minimum zones ({OMZ}s) are extended oceanic regions for which dissolved oxygen concentration is extremely low. {T}hey are suspected to be expanding in response to global warming. {H}owever, currently, the mechanisms by which {OMZ} varies in response to climate variability are still uncertain. {H}ere, the variability of the subtropical {OMZ} off central {C}hile of a regional coupled physical-biogeochemical regional model simulation was analyzed for the period 2000-2008, noting that its fluctuations were significant despite the relatively weak amplitude of the {E}l {N}ino/{S}outhern {O}scillation ({ENSO}). {I}n particular, the interannual variability in the {OMZ} volume ({OMZ}({VOL}), defined as the volume with dissolved oxygen concentration ({DO}) & {LE}; 45 & mu;{M}) was approximately 38% larger than that of the seasonal cycle, with maximum and minimum anomalies of {OMZ}({VOL}) taking place during two cold {L}a {N}ina ({LN}) years (2001 and 2007). {T}he model analyses further reveal that these anomalies resulted from a combined effect of changes in (1) the oxygen-poor waters poleward transport by the {P}eru-{C}hile undercurrent ({PCUC}), (2) the intensity of quasi-zonal jets influencing the transport of water to and from the {OMZ}, and (3) the zonal {DO} transport related to mesoscale eddy activity. {S}pecifically, the interannual variability of the {PCUC} modulated primarily the {DO} contents of the {OMZ} core [({DO}) & {LE}; 20 & mu;{M}] and secondarily the {OMZ}({VOL}), while cross-shore {DO} transport by the zonal jets and the eddy fluxes played a major role in ventilating and shaping the offshore extent of the {OMZ}. {W}hen the {OMZ}({VOL}) was maximum (minimum), the {PCUC} transport was slightly increased (reduced), which was associated with a reduction (increase) in the ventilation of the {OMZ} through negative (positive) anomalies of zonal advection and {DO} eddy fluxes. {O}ur results demonstrate that significant natural interannual variability in the subtropical {OMZ} off {C}hile originates from the interplay between oceanic equatorial teleconnection ({PCUC} transport) and local non-linear dynamics (the zonal jets and mesoscale eddies).},
  keywords = {subtropical {E}astern {P}acific ; oxygen minimum zone ; {ENSO} ({E}l {N}ino ; {S}outhern {O}scillation) ; {P}eru-{C}hile undercurrent ; mesoscale eddy flux ; {PACIFIQUE} ; {CHILI}},
  booktitle = {},
  journal = {{F}rontiers in {M}arine {S}cience},
  volume = {10},
  numero = {},
  pages = {1155932 [18 p.]},
  year = {2023},
  DOI = {10.3389/fmars.2023.1155932},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088248},
}