@article{fdi:010094824,
  title = {{M}eso- and submesoscale circulation origins for subsurface oxygen intrusions into the oxygen deficient zone of the {E}astern {T}ropical {N}orth {P}acific},
  author = {{P}ietri, {A}lice and {A}ltabet, {M}. and {C}owles, {G}. {W}. and {D}'{A}saro, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ubsurface oxygen maxima ({SOM}) are recurrent but poorly understood features within the eastern tropical {N}orth {P}acific oxygen deficient zone ({ODZ}). {H}ere, we analyze a subsurface oxygen maximum ({SOM}) observed during the {SR}2114 cruise using in situ biogeochemical and physical measurements, satellite remote sensing, and {L}agrangian particle tracking. {T}he {SOM} was detected around the 26.4 isopycnal (similar to 150-200 m) and spatially associated with elevated oxygen concentrations within an otherwise hypoxic environment. {O}ur results show that intense gap winds in the {G}ulfs of {T}ehuantepec and {P}apagayo generate strong upwelling, vertical mixing, and horizontal advection near the coast, potentially allowing subsurface layers to come into contact with surface waters and become oxygenated. {T}he observed vertical penetration of wind-driven features below the {E}kman layer also suggests the influence of eddy-wind interactions that reinforce vertical coherence and enhance the offshore transport of oxygen-rich waters. {T}he offshoreward jets observed down to the {SOM} layer depth highlight the contribution of such coupled processes to ventilating the {ODZ} interior. {F}urthermore, float-based observations along isopycnals indicate progressive oxygen loss over time, likely due to local respiration, pointing to dynamic interplay between physical supply and biogeochemical consumption. {T}ogether, these findings underscore the pivotal role of coastal wind forcing and mesoscale dynamics in shaping the subsurface oxygen landscape of the eastern tropical {N}orth {P}acific. {T}he {L}agrangian analysis also highlights distinct pathways for water parcels within the {ODZ}: south of 14 degrees {N}, water masses are primarily influenced by equatorial currents, whereas in the northern region, water parcels predominantly originate from coastal sources with extended residency times.},
  keywords = {{PACIFIQUE} {NORD} ; {AMERIQUE} {CENTRALE} ; {GUATEMALA} ; {MEXIQUE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {O}ceans},
  volume = {130},
  numero = {8},
  pages = {e2025{JC}022577 [15 p.]},
  ISSN = {2169-9275},
  year = {2025},
  DOI = {10.1029/2025jc022577},
  URL = {https://www.documentation.ird.fr/hor/fdi:010094824},
}