@article{fdi:010090747,
  title = {{I}mpacts of the mesoscale ocean-atmosphere coupling on the {P}eru-{C}hile ocean dynamics : impact of the thermal feedback},
  author = {{O}erder, {V}. and {C}olas, {F}ran{\c{c}}ois and {E}chevin, {V}incent and {M}asson, {S}. and {L}emari{\'e}, {F}. and {R}enault, {L}ionel},
  editor = {},
  language = {{ENG}},
  abstract = {{C}onsequences of the mesoscale {T}hermal {F}eed{B}ack ({TFB}) on the ocean dynamics are studied in the {S}outh-{E}ast {P}acific ({SEP}) using a high-resolution regional ocean-atmosphere coupled model. {T}hree simulations are compared: the first one is a fully coupled simulation. {I}n the second one, the {TFB} has been removed with an online smoothing of the {S}ea {S}urface {T}emperature ({SST}) conditions used by the atmosphere. {I}n the third one, to disentangle the impact of the nearshore and the offshore {TFB}, the smoothing is only applied in the offshore region. {I}n the {SEP}, the coastal upwelling cold tongue constitutes a permanent mesoscale {SST} pattern. {W}e show that this {SST} pattern alters the coastal wind structure, reducing the coastal upwelling-favorable wind intensity. {S}o, the nearshore {TFB} reduces the coastal surface current and the vertical velocities. {A}s a result, the {E}ddy {K}inetic {E}nergy ({EKE}) generation by baroclinic conversion is also weakened. {I}n the offshore region, on the contrary, the oceanic mean state is not affected by the {TFB} and only the {EKE} is weakened. {C}omposites above the coherent eddies show that the heat flux response to the mesoscale {SST} anomalies is responsible for the mesoscale activity weakening over the whole studied area. {A}lthough the wind response to the {SST} anomalies has a very weak mean impact on the {EKE} generation through wind work, we show that it strongly modifies the mean oceanic vertical velocity anomalies over the coherent eddies. {T}he ocean dynamics is usually seen as driven by the atmosphere. {H}owever, the influence between the ocean and the atmosphere is mutual and the oceanic surface conditions feedback on the atmosphere. {I}n this paper, we focus on the response of the atmosphere to the sea surface temperature mesoscale structures (structures that ranges from a few tens of km to a few hundred km). {T}his response, called {T}hermal {F}eedback ({TFB}), is modeled with a high-resolution ocean-atmosphere coupled model to investigate its consequences on the oceanic dynamics in the {S}outh-{E}ast {P}acific. {T}his region is characterized by a wind-driven upwelling of sub-surface waters near the coast, forming a sea surface coastal cold tongue. {W}e show that this structure alters in return the coastal wind structure, which contributes to reduce the upwelling and the surface current. {T}he generation of mesoscale structures, such as coherent eddies and filaments, is also reduced. {T}he mesoscale structures are also weakened in the offshore region. {W}e analyze the atmospheric response above the coherent eddies and show that the heat flux response to the {SST} anomalies is responsible for the eddy damping. {V}ertical velocities are also created in the eddy by the wind response to the {SST} anomalies. {M}esoscale thermal feedback decreases the mean coastal upwelling-favorable wind, surface current and nearshore eddy generation {M}esoscale thermal feedback on the heat fluxes decreases the coherent eddy intensity through baroclinic conversion {C}oherent eddy mean vertical velocity is strongly modified by the mesoscale thermal feedback},
  keywords = {mesoscale air-sea interaction ; thermal feedback ; {S}outh-{E}ast {P}acific ; eastern boundary upwelling system ; {PACIFIQUE} ; {PEROU} ; {CHILI}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {O}ceans},
  volume = {129},
  numero = {6},
  pages = {e2023{JC}020351 [24 p.]},
  ISSN = {2169-9275},
  year = {2024},
  DOI = {10.1029/2023jc020351},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090747},
}